Why don't you know our calendar system is indeed old & odd?
 
Why let the annual variations of the calendar confuse our memory, spend our effort, and waste our resource?
 

NexCalendar

(Natural Extension of the current Calendar)
= the First 8 months of 2024
+ the Last 4 months of 2029
+ Double Sundays on Sep 1 & 2
+ Leap Sunday on Dec 31
= Seamless Transition + Forever Benefits
It keeps consistent 13 weeks every quarter & still uses the same set of dates and months of the current calendar. People certainly know how to use it as usual.
Same calendar & same 52 weeks apply to every year. Because of the least subtle change (< 1%), it can be the simplest and seamless calendar upgrade ever.
NexCalendar is simple, memory-friendly, pragmatic, cost saving, and benefiting all people and business.
Current calendar is truly weird and inefficient that should have been fixed!
 
The Proposed NexCalendar NexCalendar is Natural Extension of the current calendar system (Calendar Reform)
 

Why calendar upgrade?

How old is the current Gregorian calendar? It was a reform of the Julian calendar in 1582. It simply has three leap days fewer than the Julian calendar in every 400 years. The Julian calendar was a reform of the Roman calendar in 45 BCE.

How odd is the annual calendar renewal? It is neither astronomical nor scientific. It is no doubt confusing, wasteful, and inefficient.

NexCalendar is Natural Extension of the current calendar system (Calendar Reform)

Unusual Fourteen Calendar Versions

The annual calendar renewal causes much trouble to us and confuse our memory. Current calendar consists of 14 calendar versions that are swapped annually to keep the right order of weekdays. There are 7 versions with 365 days for common years and 7 versions with 366 days for leap years. In history, calendars usually defined week as a subunit of a year or a month, such as 38 weeks a year in the early Roman Calendar or 3 weeks a month in the Chinese Lunar Calendar. Unusual in calendar design, the Julian calendar and the Gregorian calendar use 14 calendar versions for the sake of ensuring the rigid sequence of weekdays. It means their calendars are running two separate systems of Weekdays and Dates. That old & odd calendar feature was neither astronomical nor scientific, just complicated and confusing. Ironically, people dogmatically follow and use it.

Useless Week-based Calendar Cycle

The calendar cycle of the Julian calendar is 28 years or 1,461 weeks. The Gregorian calendar was reformed from the Julian calendar with 3 leap days less in every 400 years. The calendar cycle turns out being 400 years or exact 20,871 weeks long. The average year length is fixed to 365.2425 days approximating the mean tropical year length of 365.24219 days. The week-based calendar cycle is neither the simplest nor the most accurate calendar cycle. However, any adjustment by adding or deleting any day will break the week sequence. It means it is a closed calendar cycle infeasible to be adjusted. It should not be the chosen calendar cycle because the year length of the earth’s orbit is not a constant. The adjustment should be taken according to the astronomical observation. For example, the calendar cycle having 1 leap days less in every 128 years (i.e., 365.2421875 days) should be simplier and much more accurate. Oddly, the extreme long and rigid calendar cycle was adopted several hundred years ago that all people, organizations, and generations should adapt the clumsy annual differences forever.

Uneven, Confusing, Wasteful & Inefficient

Many people feel that the calendar looks like incomplete. It has uneven month lengths without any make-sense reasons and it changes annually. The 14 calendar versions and the rigid 400-year calendar cycle are neither astronomical nor scientific, just complicated and somehow redundant. “Unlike all other measurement systems, I felt uneasy while teaching my little son to dogmatically follow and use that weird calendar system.” The weird calendar system mainly happened from the unalignment of weeks with the year, which was very unusual in calendar systems. "The Roman calendar was a perennial calendar. Early Romans observed an 8-day week, until the 7-day week was adopted during the reign of Emperor Constantine the Great (306-337). A key goal of modern calendar reform has been to gain wide acceptance of some form of perennial calendar." The unusual annual calendar renewal is certainly the most complicated and likely the worst calendar feature. It always confuses our memory, spends our effort, and wastes our resource on dealing with the annual variations of the calendar.

14 Versions in

Gregorian calendar

28 Years per

Basic Calendar Cycle

400 Years per

Complete Calendar Cycle

20,871 Weeks per

Complete Calendar cycle


NexCalendar is Natural Extension of the current calendar system (Calendar Reform)
NexCalendar is Natural Extension of the current calendar system (Calendar Reform)

Perfect Fix
Seamless Upgrade

NexCalendar = Current Calendar of the Leap Year with Monday on January 1 + Double Sundays on September 1 & 2 + Leap Sunday on December 31
= Seamless Transition + Permanent Benefits


There are many proposals of calendar reform. Only NexCalendar introduces the least subtle change. It can be the simplest & seamless calendar upgrade ever.

Any attempt of reforming the calendar will confuse the hundred years history, culture, traditions, and religious beliefs already linked with the calendar. Only NexCalendar treasures these linkages by retaining the same set of dates and months with the least subtle change.


NexCalendar is Natural Extension of the current calendar system (Calendar Reform)

Simply Same Calendar Every Year

NexCalendar is a people-friendly and business-friendly perennial calendar. Instead of using 14 calendar versions of the Gregorian calendar, NexCalendar has only one calendar version. The same calendar with 52 weeks can work in every year. That is much simple and practical for all people & business.

Since no annual calendar variations, no confusion and wasting will happen again. Those holidays and observances without designated dates will be easily fixed on some dates. Annual planning can be simplified for all people, business and organizations. Parents, students, and teachers will be very happy to see the school terms and school breaks falling on the same dates every year.

13 Weeks Every Quarter, Same 52 Weeks Every Year

NexCalendar maintains consistent 13 weeks per quarter and the same 52 weeks for every year. February always has 29 days so as to keep the first quarter with 91 days or 13 weeks. Both the third quarter and the fourth quarter have 92 days, that is 13 weeks and 1 extra day. Double Sundays are arranged on September 1 & 2, which can maintain the third quarter with exact 13 weeks. September 1 is the New Year's Day in some countries and religions. It is also the first day of Spring in the Southern Hemisphere. September 2 was the official date marking the end of World War II. It can be called as "World Sunday of Peace". Double Sundays can be worship days or as an annual long Sabbath in the beginning of the third season.

December 31 is the last day of the year. It is set as Leap Sunday after the Sunday of December 30 in the Leap Year, which can maintain the fourth quarter with exact 13 weeks in the common year. Again, Leap Sunday can be an extended worship day or Sabbath at the end of the 4-year leap cycle.

The consistent calendar structure can make business statistics, periodical analysis, and quarterly forecasts more relevant. For people, it is a no-brainer to instantly work out the weekday of any date. The simple and consistent week system brings great convenience to all people, business and organizations.

From Monday to Sunday Every Quarter

NexCalendar is naturally and neutrally extended from the current calendar. It is compatible with the current Gregorian calendar because they use the same set of dates and months. Only the week system is subtly extended and standardized. Effectively, all quarters can start from Monday and end on Sunday. People will know how to use the simple and pragmatic NexCalendar without any explanation. The transition will be seamless and simply affordable.

NexCalendar has the most preferred calendar structure for all people & business. The adoption is certainly super simple, and the transition is seamless as having a regular swap to the next calendar version as usual. Then no further calendar renewal will be required as the simple NexCalendar is applicable to every year. Any country can afford this seamless calendar upgrade for the sake of the great and permanent benefits to all people, business and organizations.

1 Calendar

Version

4 Years

Leap Cycle

13 Weeks

Per Quarter

52 Weeks

Per Year


New Happy Features

Achieving the least subtle change (< 1%) and seamless transition,
NexCalendar merely introduces three simple and happy features:

Regular February 29

February should have 29 days making the first quarter with 91 days or 13 weeks.

Double Sundays

September 1 & 2 are annual Double Sundays in the middle of four seasons.

Leap Sunday

December 31 is rationally the Leap Sunday at the end of the 4-year Leap Cycle.

NexCalendar with the week presented from Monday:
NexCalendar is Natural Extension of the current calendar system (Calendar Reform)
NexCalendar with the week presented from Sunday:
NexCalendar is Natural Extension of the current calendar system (Calendar Reform)

Frequently Asked Questions

  • Whenever a date is mentioned, we instantly need to know the corresponding weekday. Although we can easily get help from any calendar software, the varying weekdays still cause much troubles. It confuses our memory, spends our effort, and wastes our resource on dealing with the annual calendar variations. Weeks were initially designed as a subunit of month. General deign of calendars made a month with fixed 3 or 4 weeks. That is equivalent to an hour with fixed 60 minutes. A week can have various days from 6 to 10 days largely due to the observation of the moon phases. That is the main reason why a week commonly has 7 or 8 days. Fixing 12 months a year and 7 days a week resulted the annual calendar renewal. Because the varying weekdays are neither astronomical nor scientific, but complicated and somehow redundant, all research and studies of calendars suggest reforming the calendar into a perennial calendar.

    A perennial calendar is a calendar that applies to every year, keeping the same dates, weekdays and other features. Since no annual calendar variations in the perennial calendar, no confusion and wasting will happen again. It is quite pragmatic, economical and beneficial to all people, business and organizations. For the great and permanent contributions, the calendar should eventually be reformed. Thus, there are still many proposals of calendar reform.

  • Yes, because the old and odd issues of the current calendar have been affirmed, they are obligated to discuss and accept any viable proposal of calendar reform. In 1963 the Second Ecumenical Council of the Vatican already declared that the Vatican "did not oppose efforts designed to introduce a permanent calendar into civil society."

    In 1955, the United Nations almost accepted the proposed "World Calendar" but postponed the issue after a veto from the government of the United States. The topic of calendar reform is still being explored and discussed. Saudi Arabia adopted the Gregorian calendar just from October 2016. There are still several proposals of calendar reform actively advocating to the public.

  • In June of 1954, the Roman Catholic Church was prepared to collaborate with the United Nations for a reform of the calendar, but there were still some other religious groups opposed the adoption of the proposed "World Calendar". Nowadays, the major challenges of calendar reform should be "the seamless transition and the least transition cost". Without solving these two main concerns, it is not possible for all countries to afford any calendar reform. Existing proposals tend to introduce a different month system, such as the concept of using "leap weeks" instead of "leap days" or defining 13 months per year (with 28 days per month) instead of 12 months. Some proposed different week systems, such as 6 days a week or 8 days a week.

    Any attempt of reforming the month system (i.e., the dates and months) will confuse the hundred years culture, traditions, and religious beliefs already linked with the existing calendar. Any change of the current set of dates and months is significant and unaffordable. The transition will be extremely complicated and definitely not seamless. The transition cost will be unaffordable by countries. Therefore, no proposal has been considered.

  • The Gregorian calendar is using the same set of dates and months of the Julian calendar with just three leap days fewer in every 400 years. NexCalendar is the only proposal to be compatible with both the Gregorian calendar and the Julian calendar. All existing dates and months are retained and maintained. Only the week system is subtly extended and standardized. Everyone will know how to use the familiar NexCalendar as usual. Double Sundays and Leap Sunday are happy features for all people and they are highly compliant with the religious practice. Since NexCalendar uses the same set of dates and months, the impact of change is certainly the minimum. All existing birth certificates, identity cards, passports, visas, legal documents, publications, and any documents won't be affected. All history, culture, traditions, and religious beliefs already linked with the existing calendar will be retained.

    Besides benefiting all people, there are significant economic advantages to business and organizations. Particularly, those business statistics, periodical analysis and quarterly forecasts should be more relevant because of the consistent structure of quarters and years in NexCalendar. Moreover, the transition from the Gregorian calendar to NexCalendar is super simple. It could be equivalent to a regular swap to the next calendar version as usual. Concerning software, while you may think that it will be a centennial IT project, the algorithms and programmes have been well prepared for seamless software upgrade which assure the software transition can be much simpler and cheaper than the Y2K problem fix. While we can afford the Y2K problem fix, we definitely can afford the upgrade to the NexCalendar system. The transition cost will be the least and affordable by any country. Thus, the adoption of NexCalendar is merely considered as a simple calendar upgrade or calendar extension.

  • NexCalendar supports and follows the International Standard of ISO-8601 that Monday is named as the first day of the week. In fact, the Gregorian calendar was also designed beginning from Monday. The first day of 2001 (January 1), it was Monday. The date was the first day of a new calendar cycle. Although there are countries, such as United States, South America, and China, show Sunday first in the week, they practically treat every week starting from Monday for work and take rest on Sunday. Certainly, NexCalendar can also be presented with Sunday first.

    The weekdays can be named according to different culture or religions, so that they work on the first 5 days and worship or rest on the last 2 days of the week. Thus, the Islam and Muslim-majority countries can name the days of the week accordingly so that they can pray on the sixth day to the seventh day of the week and may align with the working calendars of other countries and the international financial markets. Furthermore, since Monday to Friday are working days in the major countries, calendars may present both Saturday and Sunday in red colour so as to match the current weekend practice.

  • The leap day is an extra day in the leap year for maintaining the correct average length of the solar year (i.e., the tropical year). Considering that the common year has 365 days and the leap year has 366 days, the difference is one leap day and obviously the leap day should rationally be the last day of the leap year. It is also the last day of the 4-year leap cycle. Thus, the leap day should be rationally arranged on the last day of the leap year so that it will not affect the ordinal sequence of any days in the year and through the 4-year leap cycle. February 29 is the leap day because it was supposed to be the last day of the leap year. In the Roman age, the original Roman calendar had ten months only from March to December counting only 304 days a year (or exact 38 weeks with 8 days a week). It is obviously that September, October, November and December actually mean the 7th, 8th, 9th and 10th months from the Latin meaning. And it was reasonable to start a year from March because it was Spring. Even the year length was inaccurate with around 61 days being ignored in the deep Winter, it was a simple and consistent perennial calendar.

    Later, the Roman ruler Numa Pompilius added January and February as the 11th and 12th months in the calendar. In 46 BCE, February had 29 days and the leap day was set on February 29. For some reasons, January with 31 days was institutionally sanctioned as the first month of the year and then every year oddly begins from "Deep Winter" instead of Spring. Somehow the leap day was still retained in February without probably rearranged. We all know that February is weirdly the shortest month with only 28 days in the common years. It also causes some issues, such as in the "Day-Count Convention" for finance, accounting and payroll. Thus, NexCalendar maintains February with regular 29 days, which also makes the first quarter having the consistent 13 weeks. December 31 is most rationally set as the Leap Sunday. Since December 31 is part of the double Sundays, people born on December 31 will fairly find no difference to celebrate birthday on the Sunday of December 30 in the common year.

  • Birthday Leave is a common practice in many companies and countries. For people born on a working day, they can be entitled for a paid birthday leave. That makes sure all people may have a birthday off. The policy can even be extended to the spouse or parents, so that they may celebrate birthdays with their spouse or parents. It is easy and feasible to ensure all days are good birthdays. Furthermore, it is also common for people to celebrate birthday in the weekend. By the way, the superstition of bad luck Friday 13th does not exist in NexCalendar. The 13th day of any month in NexCalendar will never be on Friday.

  • NexCalendar has the same 52 weeks per year and consistent 13 weeks per quarter. That is excellent for business planning and school schedules. We don't have to rework the annual schedules every year. The statistical analysis across years and quarters will be much relevant because of the consistent and equivalent week patterns across years and quarters.

    The week system is sometimes more useful than the month system in our daily life. Besides addressing a date via month and the day of the month, NexCalendar allows an alternate way of addressing a date precisely with the week number and the day of the week where the week is numbered from 1 to 52 for a year and the day of the week is numbered from 1 to 7. Weekday 1 to 7 stands for Monday to Sunday. Weekday 7 prefix with 'x' may denote the Second Sunday in week 35 and week 52.

      For example, dates may be presented as:
      w01.1 (or 01:Mon) stands for the Monday of the first week which is January 1.
      w01.7 (or 01:Sun) stands for the Sunday of the first week which is January 7.
      w06.3 (or 06:Wed) stands for the Wednesday of the sixth week which is February 7.
      w35.7 (or 35:Sun) stands for the Sunday of the 35th week which is September 1.
      x35.7 (or 35:SSu) stands for the Second Sunday in the 35th week which is September 2.
      w52.7 (or 52:Sun) stands for the Sunday of the 52th week which is December 30.
      x52.7 (or 52:SSu) stands for the Second Sunday (Leap Sunday) in the 52th week which is December 31.

  • NexCalendar is compatible with the current calendar system. The switch from the current Gregorian calendar to NexCalendar is super simple. It is easy to adopt NexCalendar in any year. While NexCalendar can coexist with the current calendar system, it could be similar to countries with different time zones. For seamless transition and adoption, it will be better to transit in those years starting on Monday, such as 2024 and 2029. There will have 4 years starting on Monday in every 28 years.

    If the year starting from Monday is a leap year (such as 2024), the first 8 months of NexCalendar will be same as the first 8 months of the Gregorian calendar (i.e., 66% identical). If the year starting from Monday is a common year (such as 2029), the first 2 months and the last 4 months of NexCalendar will be same as the corresponding 6 months of the Gregorian calendar (i.e., 50% identical). If its next year is a common year that starts from Tuesday (such as 2030), the months from March to August of NexCalendar will also be same as the corresponding 6 months of the Gregorian calendar (i.e., 50% identical). People will almost find no significant difference during the transition. After the seamless transition, every year will use the same calendar version forever. All people and business will gain the significant and permanent benefits from using the simple NexCalendar.

    The seamless transition approach will be very simple. All dates will be effectively intact and unchanged, except December 31 in the common year of NexCalendar will be treated as or converted into December 30. That will be the least impact except permanent benefits to all people and business.

  • In 2018, when I taught my eight years old son about the current calendar system in Auckland, he intuitively asked me several simple questions that I could not answer. Those questions included why February is particularly short, why August is a long month, why we need to renew the calendar every year, and whether the month lengths relate to any astronomical observation. Ironically, those simple questions are not explained in any textbook. Then, I started the research on calendar systems and found out that the design of the Gregorian calendar was neither astronomical nor scientific, but somehow arbitrary. The annual calendar renewal is the worse and most arguable calendar feature, which is annoying, inefficient, and redundant. It confuses our memory, spends our continuous effort, and wastes resource on dealing with the annual calendar variations.

    However, we seem have no choice and just dogmatically follow the current Gregorian calendar. In fact, such old and odd calendar system should have been reformed. And there were some trials of using different calendar systems and there were many proposals of calendar reform. All research and studies of calendars suggested aborting the annual calendar renewal and adopting a perennial calendar system. However, none of them were accepted. Besides the religious concerns, those proposals introduced different month systems that will lead to significant impact of change as well as enormous transition effort and cost.

    Our calendar system is combined with a month system and a week system. While these two systems are not aligned, annual calendar renewal is unavoidable. If they are aligned, it is a perennial calendar system. All proposals focused on revising the month system because of the uneven month lengths, but all troubles actually come from the strict 7 days a week. Thus, NexCalendar was designed to adopt the same month system with a subtly extended week system. Having taken two years rigorously design and verified by thousands of people of different ages, religions, and background, NexCalendar was developed to be the most viable solution with the least subtle change. There are just 1% rational and insignificant differences, but the advantages and benefits are permanent and forever.

    The two new features of Double Sundays and Leap Sunday are happy features that can eliminate the annual calendar renewal and maintain the consistent calendar structure with 13 weeks per quarter and the same 52 weeks for every year. Still these features are highly compliant with the religious practice. In Bible and many religions, there are special eight-day periods, such as Octave and the eighth day Sabbath. The early Julian calendar fixed 4 weeks a month with the mix of 8-day weeks and 7-day weeks before the official adoption of the strict seven-day weeks in 321 CE. As the fundamental design, NexCalendar is compatible with the Gregorian calendar, as well as the Julian calendar, because of using the same set of dates and months. With the simple and consistent structure, NexCalendar can offer the equivalent practical advantages and benefits of other proposals. Only NexCalendar can achieve seamless transition with the least transition cost that any countries and organizations can afford it. It is the simplest and most viable calendar upgrade ever.

  • The Gregorian calendar has been adopted as the civil calendar by all countries. It was reformed from the Julian calendar in 45 BCE. The reform retained the same set of dates and months of the Julian calendar. The Gregorian calendar merely removed three leap days from the Julian calendar in every 400 years. Thus, NexCalendar also retains the same set of dates and months of the Gregorian calendar. Only five weeks are subtly extended in every 4-year leap cycle. The least subtle extension can retain the hundred years culture, traditions, and religious beliefs already linked with the calendar. That also represents the highest respect to the religions.

    Concerning the subtly extended week system, 97.6% are normal seven-day weeks. Merely 2.4% are long weeks (5 long weeks out of 208 weeks in 4 years). The long week contains an extra Sunday that religions may arrange extended Sabbaths or extra worship days on the first day of the third season (Spring of the Southern Hemisphere) and at the end of the 4-year leap cycle. That arrangement is the best alignment with astronomical fact that a year has around 365.25 days, in which there have one extra day per year beyond 52 weeks and one extra day per 4-year leap cycle.

    Religions initially believed that "Seven" is the special number arranged for the lunar cycle and the solar cycle. Therefore, months were assigned with around 28 days. Nowadays, we know that 29.53058 days is the mean the lunar months, which is neither a whole number nor a multiple of seven. 365.24219 days is the mean of the solar months, which is also neither a whole number nor a multiple of seven. The alignment between the lunar cycle and the solar cycle must take around 19 years, which is not a multiple of seven as well. It means God (the creator of the Universe) never applied the whole number of seven into any cycles. Now, we can preciously measure the cycle of a year. However, due to the ancient belief of the designated multiple of seven, the weird unalignment of weeks with the year significantly cause the calendar system over-complicated and confusing. For example, the Easter day falls on Sunday but the date is different every year. It can be within April or in late March. The Christmas day is on December 25 but the day of the week is varied every year. It seems these two important days were inconsistently set by two different religious groups. That were obviously because of the deficiency of the current calendar system.

    The seven-day week analogously corresponds to the seven days of world creation. But God didn't strictly apply the rule of seven into the lunar and solar cycles. It is controversial that the confusing annual calendar renewal may not be the best to meet God's preference. Thus, NexCalendar takes the best compliance to the seven-day week with subtle extension to embed the exact day per year and the extra day per 4-year leap cycle with the concept of Double Sundays and Leap Sunday. Early Romans used a period of eight days in civil practice for centuries before Emperor Constantine established the seven-day week in 321 CE. The mix of 8-day weeks and 7-day weeks existed in the age of Jesus Christ that he didn't argue at all. In the Bible and many religions, there are some special 8-day weeks, such as the Octave in Christian liturgy and the Eighth day Sabbath. NexCalendar ensures single calendar version with the same 52 weeks for every year, that permanently benefits all people and all religions. The precise and consistent days of Sabbath every year plus the reasonable Double Sundays and Leap Sunday for extended Sabbaths present higher respect to the religions than using the clunky independent week system and the confusing annual calendar renewal.

  • There are three main challenges while advocating NexCalendar.

    1. People don't know they don't know the annoying issues of the current calendar system. Even we are using the calendar daily, only few people aware of the issues of the current calendar because we born to dogmatically use it without choice. The embarrassing facts of the Gregorian calendar system, its weird design, and the disadvantages are not explained in any textbook. Thus, we generally believe that the varying weekdays of dates are unalterable and normal. In fact, the annual variations are unnecessarily over-complicated and somehow redundant. We need to let people recognize the weird design and the annoying features of the Gregorian calendar ahead of explaining any proposal of calendar reform.

    2. People don't know the calendar can be reformed. Major people think that the current calendar system was proven astronomically and scientifically. Thus, people assume the calendar is unalterable. However, the Gregorian calendar was reformed for setting the correct date for Easter instead of any astronomical or scientific reason. Since the last reform could not satisfy the expected result, "Search of a common date for Easter" is still being proposed and discussed. the Gregorian calendar simply has three leap days fewer than the Julian calendar in every 400 years. Although the same set of dates and months was used, the calendar cycle was changed from 28 years in the Julian calendar to 400 years long in the Gregorian calendar. The reform, which made the calendar system over complicated, should be rectified and the calendar system should be simplified for this modern age. Thus, there are still many proposals of calendar reform.

    3. People don't know the calendar can be seamlessly reformed. People think that whatever reform on the calendar system will have a dramatic impact on the society and business that the transition efforts and cost will be unaffordable. However, NexCalendar is the only proposal with the design goals to achieve the least subtle change, seamless transition, and the lowest transition cost by retaining the same set of dates and months of the current calendar. NexCalendar is also the only proposal that is compatible with the current calendar. Furthermore, these two calendar systems can coexist and be inter-convertible. Countries using these two calendar systems will like countries in different time zones. The same date in different countries may have one day difference. Besides the seamless transition, the transition cost will be insignificant and affordable by any country and organization, while the benefits will be permanent.

NexCalendar with the same 52 Weeks per year
NexCalendar is Natural Extension of the current calendar system (Calendar Reform)

Even Better Reform

  • February is unusually short without any make-sense reason. In fact, no calendars made such weird and arbitrary uneven month lengths, except the one that we are using. However, any change in the month length will remove some existing dates. That will result significant effort in transition. In order to let February with 30 days, a day in another month will be removed. Common suggestions are either July 31 or August 31. With consideration of the least impact, January 31 will be the best candidate because only the days in February will be affected. In consequence, all dates will be just within one day different from the Gregorian calendar while both calendar systems are used together. It can still achieve seamless transition. Let’s call that calendar as "Better NexCalendar".

    In "NexCalendar", February is still unusual short:
    Month123456789101112
    Days312931303130313130313031


    Better NexCalendar = NexCalendar – January 31 + February 30

    The month length of "Better NexCalendar" will be either 30 or 31 days. The month length pattern will be 30, 30, 31, 30, 31, 30 from January to June and 31, 31, 30, 31, 30, 31 from July to December. The short and long pattern of the months in the first half year is simply opposite to the months in the second half year.

    "Better NexCalendar" setting January and February with 30 days:
    Month123456789101112
    Days303031303130313130313031


    "Better NexCalendar" is equivalent to NexCalendar having 30 days for January and February instead of 31 and 29 days. NexCalendar can achieve seamless transition that all dates will be effectively intact and unchanged, except December 31 in the common year of NexCalendar will be treated as or converted into December 30. "Better NexCalendar" can have the equivalent seamless transition by assuming the removed January 31 as "January 30". That simply means the birthdays and anniversaries on January 31 will become on January 30. Equivalently, January 31 in "Better NexCalendar" will be treated as or converted into January 30.

    Astronomically, it makes sense that January and February are short months because they are within the shortest season, while July and August are long months because they are within the longest season. If we agree February with 30 days, "Better NexCalendar" will be the best reform with the least transition impact.

    Season
    Months
    March,
    April,
    May
    June,
    July,
    August
    September,
    October,
    November
    December,
    January,
    February
    NH Season SpringSummerAutumnWinter
    SH Season AutumnWinterSpringSummer
    Season Days
    "NexCalendar"
    92929190 / 91
    Season Days
    By Season Event
    ~92.8~93.6
    (Longest)
    ~89.9 ~89.0
    (Shortest)
    Season
    Event
    Vernal
    Equinox
    Summer
    Solstice
    Autumnal
    Equinox
    Winter
    Solstice
    Event Date
    (UT-8)
    March
    19 (Tue)
    June
    19/20 (Thu)
    September
    21/22 (Sat)
    December
    20 (Thu)
    (UT) 19 (Tue)20 (Thu)22 (Sat)20/21 (Fri)
    (UT+8) 19/20 (Wed)20/21 (Fri)22 (Sat)21 (Fri)

    ** An ideal simple calendar structure can have odd months (1,3,5,7,9,11) with 30 days and even months (2,4,6,8,10,12) with 31 days. Double Sundays will fall in "the middle of the year" on June 30 & 31. Leap Sunday will be still on December 31. Four existing days (31st of January, March, May, and July) will be removed. Although it is the simplest and balanced calendar structure, it seems unadoptable because of the much significant transition cost and impact. The history, culture, and traditions linked with the current calendar system will be much confused. **

    Simplest & balanced calendar structure but unadoptable:
    Month123456789101112
    Days303130313031303130313031

  • A Lunar cycle means a full cycle from a full moon to full moon and it takes approximately 29.530589 days in total. Thus, lunar calendars have alternate 29 and 30 days per month. A Solar Cycle means the time period required for Earth to complete one revolution around the sun and takes approximately 365.24219 days in total. Thus, a solar month means one twelfth of a solar year which is either 30 or 31 days. By putting the lunar cycle on a solar calendar with alternate 30 and 31 days per month, the full moon days will approximately decrease by one day each month. For example, if there is a full moon on the 20th day of this month, the next full moon will be on the 19th day of the next month. The full moon of the month after the next month will be on the 18th day, and so on. By the way, the full moon day and time can have one day variation because of the different time zones and view angles of different countries.

    To approximate the full moon cycle on a solar calendar with alternate 30 and 31 days per month, I worked out an easy algorithm named as "Donny's Linear Projection of Full Moons" with only three simple rules. The algorithm can linearly project the occurrences of full moons with the average of 29.53085 days per lunar month in every 19 years. With statistical validation from 1901 to 2052, 52.34% of the projected full moon days can accurately fall on the exact full moon days. 45.53% of the projected full moon days can be just one day different from the actual full moon days. That is equivalent to 97.87% accuracy. (The Linear Projection can achieve above 99% accuracy on the simplest calendar structure with alternate 30 and 31 days per month.) The three simple rules of the algorithm are as follows:

    1. For January, the full moon day will repeat the full moon day of last December.
      E.g., If there is a full moon on December 20, the next full moon will be on January 20.

    2. The full moon day will decrease by one day each month.
      E.g., If there is a full moon on January 20, the next full moon will be on February 19, then on March 18, and so on.

    3. If full moon happens on the first day, full moon will happen again on the last day of the month, and then on the 30th day of the next month (including January).
      E.g., If there is a full moon on July 1, the next full moon will be on July 31, and then on August 30.


    E.g., The Linear Projection of Full Moons from 2028 to 2031 in "Better NexCalendar":
    2028 month12345678910111212
    day12111098765432131

    Since last December has two full moons, January will have full moon on the 30th day:
    2029 month123456789101112
    day302928272625242322212019

    January will repeat the full moon day of last December:
    2030 month123456789101112
    day1918171615141312111098

    August of 2031 will have two full moons on the first day and the last day:
    2031 month1234567889101112
    day 8 7 6 5 4 3 2 13130292827

    The algorithm can work effectively on "Better NexCalendar". That is the best alignment with the lunar cycle.

    ** Both the solar cycle and the lunar cycle are not constant. They are varied alone with various astronomical factors. Those cycles should be calibrated by ongoing astronomical observation instead of making them constant in the calendar. For example, the centurial leap year calibration will be much accurate by simply removing one leap day in every 128 years, which will be equivalent to the average year length of 365.2421875 days (i.e., 365.25 - 1/128). The average year length will accurately approach the mean tropical year length of 365.24219 days. **


We deserve a better calendar.

It is very challenging to disseminate the proposal of NexCalendar to all people in the world, we sincerely need your support and sponsorship for our advocacy campaigns.

Better NexCalendar vs.
Better NexCalendar is Natural Extension of the current calendar system (Calendar Reform)
NexCalendar in Matrix
NexCalendar is Natural Extension of the current calendar system (Calendar Reform)
NexCalendar is Natural Extension of the current calendar system (Calendar Reform)

Your Support

NexCalendar was scientifically designed, societally assessed, and rigorously verified. During the process, we found that almost no one can explain why and how the current calendar was evolved from and designed for because people just dogmatically follow and use the calendar. They certainly don't understand why the calendar should be reformed. Once they know the ridiculous inefficiencies and the deficiencies of the current calendar, they will question why we keep using such weird calendar system without any reform.

Please share and discuss the inefficiencies and deficiencies of the current calendar with your friends, family members, relatives, neighbours, classmates, colleagues, and anyone. Please mention about the proposal of NexCalendar and its great contributions to people and business. It is the only proposal that can seamlessly upgrade the current calendar into a much practical perennial calendar system. NexCalendar is super simple, familiar, pragmatic, memory-friendly, business-friendly, and permanently cost-saving.

NexCalendar is Natural Extension of the current calendar system (Calendar Reform)

Your Sponsor

There are several ways to sponsor our advocacy campaigns. You may kindly offer or donate some funding to us so that we can organize more campaigns and advocacy activities. You may sponsor us to make some souvenirs, such as T-shirts or cup mugs. With NexCalendar printed on the T-shirts or cup mugs, the souvenirs can be useful in our whole life because NexCalendar is permanently applicable to every year.

It is certainly very challenging to arrange advocacy campaigns in all countries. Besides using the internet media, we hope NexCalendar can be disseminated and discussed in all schools, universities, associations and organizations. Eventually, the proposal of NexCalendar can be accepted and adopted by countries as the world's civil calendar. Please let us know if you may help us to effectively realize this mission.

"Better NexCalendar" with 30 or 31 days per month:
Better NexCalendar with consistent 30 or 31 days per month (Calendar Reform)
NexCalendar with unusual short month in February:
NexCalendar with unusual short month in February(Calendar Reform)