Calendar reform: Time for a change?

JOHNS HOPKINS (US) — Calendar reform advocates are convinced that a new, standardized alternative to the Gregorian calendar would save trouble and money.

Two such advocates have proposed a new calendar in which each new 12-month period is identical to the one before, except for a “leap week” thrown in at occasional, but regular, intervals.

Going by the proposed Hanke-Henry Permanent Calendar, for instance, if Christmas fell on a Sunday in 2012 (and it would), it would also fall on a Sunday in 2013, 2014, and every succeeding year.

The mnemonic rhyme “30 days hath September, April, June and November,” would no longer be accurate, since September would have 31 days, as would March, June, and December, the months ending each calendar quarter. All other months—the first two months of each quarter—would last 30 days.

“Our plan offers a stable calendar that is absolutely identical from year to year and which allows the permanent, rational planning of annual activities, from school to work holidays,” says Richard Conn Henry, an astrophysicist at Johns Hopkins University.

“Think about how much time and effort are expended each year in redesigning the calendar of every single organization in the world,” he says, “and it becomes obvious that our calendar would make life much simpler and would have noteworthy benefits.”

Among the practical advantages would be the convenience afforded by birthdays and holidays (as well as work holidays) falling on the same day of the week every year. But the economic benefits are even more profound, says Johns Hopkins applied economist Steve H. Hanke, an expert in international economics and monetary policy.

“Our calendar would simplify financial calculations and eliminate what we call the ‘rip off’ factor,'” Hanke says. “Determining how much interest accrues on mortgages, bonds, forward rate agreements, swaps, and others, day counts are required.

“Our current calendar is full of anomalies that have led to the establishment of a wide range of conventions that attempt to simplify interest calculations. Our proposed permanent calendar has a predictable 91-day quarterly pattern of two months of 30 days and a third month of 31 days, which does away with the need for artificial day count conventions.”

Hanke and Henry say their calendar is an improvement on the dozens of rival reform calendars proffered by individuals and institutions over the past century.

“Attempts at reform have failed in the past because all of the major ones have involved breaking the seven-day cycle of the week, which is not acceptable to many people because it violates the Fourth Commandment about keeping the Sabbath Day,” Henry says. “Our version never breaks that cycle.”

Henry argues that his team’s version is far more convenient, sensible, and easier to use than the current Gregorian calendar, which has been in place since 1582, when Pope Gregory XIII altered a calendar that had been instituted in 46 BC by Julius Caesar.

The Gregorian reform was instituted to deal with the fact that a solar year is slightly shorter than the 365.25 days that had been calculated centuries earlier. In an effort to bring the calendar back into synch with the seasons, the pope’s team also removed 11 days from the calendar in October 1582, so that Oct. 4 was followed immediately by Oct. 15.

Like Gregory’s calendar makers, Hanke and Henry had to deal with the fact that a solar year is actually 365.2422 days long, making, under the Gregorian system, a “leap day” necessary almost, but not quite, every four years. The Hanke-Henry approach was to construct a standard, unchanging 364-day calendar and add a “leap week” at the end of December every five or six years.

In addition to adoption of their calendar, Hanke and Henry want to see the abolition of time zones and the adoption of “Universal Time” (formerly known as Greenwich Mean Time) in order to synchronize dates and times worldwide, streamlining international business.

“One time throughout the world, one date throughout the world,” they write in their article, published in the journal Global Asia.

“Business meetings, sports schedules, and school calendars would be identical every year,” they write. “Today’s cacophony of time zones, daylight savings times, and calendar fluctuations, year after year, would be over. The economy—that’s all of us—would receive a permanent ‘harmonization’ dividend.”

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chat37 Comments


  1. Donald K. McKenzie

    …. too bad these high paid gurus don’t have any real work to do …. they need to get into the real world and don some real work, like dig ditches or something else constructive.

  2. antoniocristovao

    interesting, however the advantages are on a west perpective. the muslims, chinese and indians that are more than half of world population feel that to have chage would be other way quit diferent.

  3. Simon Dixon

    This thing will go no further than the moment many people realize that their birthday will never again fall on a weekend. Just get rid of daylight savings time and I will be happy.

  4. George Zimmer

    Why not just use the old Mayan lunar calendar, 13 28 day months.

  5. Brick Brewer

    The new proposed version of the calendar is very interesting — and very old.

    When the calendar was re-designed in (I thought it was 48 BC), it was designed by a solar designer and it was intended to be a solar calendar. The problem comes in when it is realized that in 46-48-BC, the Roman initiative was with a Lunar configuration. They worshipped the moon. I cannot recall whether the problem was the date of the new moon (which is what I suspect) or the date of the appropriate full moon, but, rather than starting the calendar on the Winter Solstice (which was part of its original design), they made the start of the year as a floating date dependent on the phase of the moon. If they had pegged the start of the year to the Winter Solstice (as it was in its design), every following date would appear on the same day of the week in every year. If the calendar had been started as what it is — a solar calendar starting on the pre-eminent single day of the year, the Winter solstice — our calendar would be the same each year (meaning thay your birthday would always fall on the same day of the week, so would December 25 or April 1 or whatever.

    The simplicity is that over time it is quite normal to understand that ideas change and to realize that the officials of 48 BC would have very different ideas about time than we have in 2011-12. My guess is they had no idea how that change (to start in concert with the moon rather than with the sun) would eventually pay off. Back then they didn’t count years the way we do … it was more apt to be centered on reign-dates (how long a particular monarch ruled) … there was no general accounting, no BC, no AD, no weekends, no daylight savings, no need to concentrate on your mother-in-law’s birthday, no build-up of hundreds or thousands of years, etc.

    This same calendar was changed later to accomodate what we have called ‘Leap Year’ (adding an extra day and thus changing the day of the week correlation by another degree of difficulty), but the original calendar (48 or so BC) is the one that made sure that the different years started on different days of the week — it’s the one people try to change. It’s the one that was planned correctly but executed in such a way that it never aligns the Solar realm with the Lunar realm. And, among the various ways this is felt, is it guarantees each year will start on a different day and that guarantees that all ‘event days’ and almost all holidays will rotate among the days of the week.

  6. Peter

    Twelve months of 30 days each plus an intercalary period of five or six days that don’t have days of the week.

  7. Janet

    If anyone noticed, the calendar days changed in practice with the extra leap year in 2000. The holidays are not falling the same way as before. Go back and look. Labor Day falls in a different pattern. I know because my birthday is on September 2nd and never came after or on Labor Day, and now it has. Christmas falls differently too. Only people with nothing else better to do than make changes that will dictate to the rest of us want all Monday holidays. Personally, I don’t like Christmas falling on Sunday, but it did give us a federal holiday on Monday and those affected actually got 2 Christmas days. I’m not a federal employee but that was great for our small business. We were open on Monday and had lots of customers who were able to come in who normally would be working. The rest of the world won’t go for changing December 25th. It’s not “broke” so don’t fix it. I think with that Year 2000 leap there was enough change to deal with for another 100 years. Well, I think I’m dealing with two subjects. There is joy in spontaneity. You have to use your brain skills that way. Oh, there is one more subject; the 19th Century was from 1801-1900. The 20th Century was from 1901-2000. The 21st Century started in 2001. There are so many who don’t see that. Again, please look that up at

  8. annoyed kid

    Oh great. I would just loove that, I definitely always want my birthday during school. Why can’t people just leave things alone and stick to what everyone already knows? Besides, we pay people to fix the calendars every year. The economy is in the toilet in so many countries, so how can that be a wise decision?

  9. World-Calendar

    I applaud the architects of this calendar for desiring to respect the Sabbath day by not altering the seven-day cycle. The irony of the situation is that the Biblical Sabbath was never based upon a continuous week. The original calendar described in the Torah and used by Moses was based upon the phases of the Moon. This Lunar Calendar was used for all the feast days described in Leviticus 23, including the weekly Sabbath.

    The Biblical calendar starts every month on New Moon Day, and the Sabbaths are always in the same place: The 8th, 15th, 22nd, and 29th of the month. This is why the feast days have a Sabbath on the 15th of the month.

    Calendar reform, of course, is not a new concept. In AD 321, Constantine created a compromise calendar. He blended the Hebrew idea of a seven day week with the Julian concept of a continuous weekly cycle, and emphasized the day of the “sun god” to create the Roman calendar used today. He enforced his calendar upon the entire Roman Empire with military power.

    Constantine and the Council of Nicaea in AD 325 replaced Passover with Easter. This was not just a matter of replacing one day with another. It’s a completely different system of calendation, since Passover is not computed using a Julian calendar.

    Because of these changes which were being enforced by persecutions across the Roman Empire, the Jewish Sanhedrin met for the last time around AD 350, and modified the calendar to the form used by most Jews today, in which the Sabbath is on Saturday, but the other Feast Days use a form of the Lunar calendar.

    However, the true Calendar ordained at Creation, according to Genesis 1:14, Psalms 81:3, and 104:19 uses the Clock in the Sky: The Moon.

    See for details.

  10. Trish

    Why would you want one time across the globe? So while it’s 8am in California it’s 10am in the UK and is dark out? That’s silly. like the others say, if it isn’t broke, don’t fix it. Though get rid of day light savings time!

  11. BigBubba

    Since the amount of days in a given year wouldn’t correlate with the actual time of a year (the time it takes Earth to orbit the Sun), the solstices would never be on the same days, effectively screwing up when the seasons occur (according to the calendars).

  12. Jay Theo

    Funny how humans get attached to habit. Habit is the enemy of new ideas.

    Having one time world wide would be welcome. Someone proposed “internet time” that would be the same for everyone. Who cares, really, what number the big and little hands are on when you grill your trout for dinner?

    Evidence that not only do people get attached, they get attached to abstract concepts: the numbers representing the time.

    One benefit is navigation. If it’s 1:32PM Internet Time and the sun is directly overhead, then you’d know exactly what longitude you were at.

    As to so-called daylight savings time, don’t get me started on that assinine politically legislated absurdity. Can you say the word “arbitrary”?

    I applaud the Hanke-Henry proposal. Suggest there be calendars and watches to track it ASAP. “oh that’s an unusual watch….”

    “Yes it tracks both colloquial time and Unified Time.”

    Bring it on.

  13. Crayton

    Made some tweaks:

    It gets rid of the anniversary problem where people born on “Xtra” have to reschedule their birthday most years.

    It also proposes a solution to “my birthday would never move” by eliminating the numerical days of the month. Seriously, that is the thing we forget most often. We know the day of the week and about when in the month it is, but is it the 6th, 7th, 8th? We forget and have to ask someone, consult a calendar, or count back the days in our head since a recent holiday.

    Counting the days of a month was invented with the advent of Christianity because the week no longer fit evenly into each month. Before then, the Romans’ had weeks that did fit into each month, though some were of different lengths. The “Ides of March,” for example, was the beginning of the third week of March.

  14. Frances O'Neill Zimmerman

    I don’t like Mondays for official holidays unless it’s Labor Day and I don’t understand what special interest is served by the Daylight Saving Time change-for-change-sake scams. Let’s fix those and then fool around with the rest of our “calendation” — a word I’ve never before seen or heard. (We have much to learn from correspondent World-Calendar.)

  15. DaveGrinberg

    Has anyone thought about the economic impact of the conversion itself? This would be comparable or even bigger than the whole Y2K IT reform. Might be just what the entire world needs to kick start demand and get growth back on track, and it would take long enough that it might succeed in spinning up the demand-growth-demand cycle.

  16. Cynthia

    Not that this is of utmost importance, but what happens to people with birthdays on January 31st, May 31st, July 31st, August 31st, and October 31st? Not just in regard to “celebrating”–birthdays are used as an identifier for credit reports, Social Security, medical records, employment, etc. And what of the babies born during the “once every five or six years” leap week? What are THEIR birthdays?

  17. Albert Manfredi

    Sorry, but this is just another one of many such attempts, even in recent years. Every one has its own compromises, which are arguably no better than what we have now.

    First comment. You want a common time around the globe? We ALREADY have that, and it is used whenever this is a useful thing. It’s traditionally been called GMT, and now it’s called UTC. Universal Coordinated Time, 86400 seconds per day, occasionally adjusted by means of adding or subtracting a second, to keep atomic time and solar time in sync. (Oh, and people even want to mess with that idea too!. By eliminating the leap second! How smart is that?) So, the common time around the world can be used by people TODAY, no need to change anything at all. In navigation, for example, UTC is always used. Why would anyone think that it makes more sense to have a common time value around the world, as opposed to having a common time convention for daylight and nighttime hours? It’s just a different compromise.

    As to days of the week, this plan creates the need for the occasional leap week. Sort of dead time, created by fact that the 7-day week doesn’t fall evenly in a 365 1/4 day year. Something has to give. So, why is that leap week not described as a new anomaly that we do not need now? How will that figure into all those ripoff schemes mentioned in the article?

    The other point has to do with when a century starts, since that was brought up by a poster. Balderdash, I say. According to the Roman Calendar and religious tradition, which is what years were numbered by, like it or not, Jesus Christ was born at the end of the year 753 Ab Urbe Condita (AUC), i.e. since the founding of Rome. So, 25 December 753 AUC is the traditionally accepted (though perhaps inaccurate) day when the first century started.

    BUT, the year 1 AD starts on 1 January of 754 AUC, not 753. By defintion, AD = Anno Domini, and you are not one year old the day you are born. By making 1 January 754 AUC equivalent to 1 January 1 AD, the calendar implicitly defined a year 0 AD = 753 AUC, the year Christ was (by religious tradition) born.

    This says, the first millenium started the year Christ was born (by tradition), which was 753 AUC or 0 AD. The third millenium therefore started on the year 2000!

    Now, MAYBE, for those who use CE rather than AD to denote the current year, the claim that a centiry starts on the 01 year has some merit.

  18. Chase Keightley A&S '68

    The Hanke-Henry calendar is BORING. I like things all mixed up. Variety is the spice of life.

  19. Ash

    I didn’t read all the comments (most of them seemed to say the same thing) but by the loks of things everyone is just a whiner. So what if your birthday no longer falls on a weekend, take some annual leave. Oh it’s 10am and dark where you live now? Who really cares as EVERYONE (bar perhaps one timezone) has to readjust.

    Personally, I’d have no problem learning new months or living with a different time. It would make everything for everyone so much easier, much more streamlined year to year.

    Too bad it won’t happen.

    Also I like the fact that they kept a seven day calender. But to appease religious types? Wrong reasons man, or they are just trying to get a certain demographic on board with them.

  20. Crayton

    I agree. Adjusting will be fairly simple. I think the time thing runs in to problems when the date changes in the middle of the afternoon in California, but the calendar thing is great.

    The seven-day week is useful for businesses as well as religious-types. But, the whole leap-week thing is definitely for religious-types. Businesses could handle an 8-day week every once in a while, religious-types (some, and I am not using the term pejoratively) could not.

  21. Albert Manfredi

    It is quite common for those who have some “new idea” to only trumpet the advantages, and to dismiss the disadvantages. As clearly seems to be the case here.

    Trading off one set of compromises for another set of arguably even worse compromises, does not make a compelling case. There is not reason at all why anyone should have to adjust to the new set of compromises.

  22. Rob N

    Albert – can you also defend the Qwerty keyboard over Dvorak using that same argument? It falls short there and I feel it falls short here too.

    Yes, there are some downsides, but they are demonstrably much less than the current downsides, and mostly involve the transition period.

    Still, I’d prefer 13 months of 28 days each (so the 1rst, 8th, 15th, and 22nd of each month are always Sunday for example). Then add one day each year that is not a day of the week, call it New Years Day. Then every leap year, add another day that is not a day of the week. Seems simpler to me than adding leap week and having monthly dates falling on different days of the week depending on which month it is.

  23. Albert Manfredi

    Rob, the QWERTY keyboard is still more popular than the Dvorak. I get your point, however there is nothing really new about any of these “must really go this way” ideas. And truly, no reason for anyone to feel that the human race is compelled to make a change, so as not to be considered whiners. There is nothing truly compelling here.

    If people were interested in having a single time around the globe, i.e. a time standard that was unrelated to local daylight cycle, that solution has been available since 1884. Originally called GMT, and UTC since 1972. And it does get used, where there are advantages to doing so. Hardly a great new idea.

    As much as people travel these days, it seems truly odd to push for a scheme where you have no idea what the time of day is locally, in your new destination, upon arrival. Wherever you go, you need to learn the oddities of when people wake up an when people can be expected to be at work. Why was this disadvantage not mentioned explicitly, instead of only looking at supposed advantages?

    As to months and days per month, as you noted so well, no scheme is free of faults. You always have to add days, or weeks, at odd times of year, to bring everyhting in sync. It’s very arguable whether one oddball quirk is truly preferable to another. Some might argue that the current scheme is clearly the best, because the biggest quirk in it is to add just one day to one of the months, every four years. Imagine such stability. Hard to do without.

    And, some might also argue, anyone who can’t get used to the day of the week not always falling on the same day of the month is a whiner.

  24. Eric

    Some ideas for change are good, and some are not so good. This one is terrible, for several reasons. The issue of birthdays, anniversaries and other celebratory days being pinned to the same day of the week every year would be off-putting for many people, no matter what day of the week is involved. Many people have weekends off, but not people who work at sporting events, for example. The issue of the “leap week” is even more contentious. What dates would those days correspond to? Those days would be “orphaned”. A single leap day every 4 years isn’t a big deal (except for people whose birthday is February 29), but an entire week every 5 or 6 years is not trivial at all. There would be more than 7 times as many people without an annual birthday, and since the leap week isn’t in any month, they would essentially have no birthday at all. In addition, as Cynthia mentioned, some people whose birthdays are included in the current calendar would lose their birthdays in the new one. Confusion over the new number of days in certain months would probably take years to resolve, and this situation would be worsened by the inevitable need to refer to historical dates in the Gregorian calendar. In effect, we would have to work with two calendars instead of one. Finally, the average interval between leap weeks wouldn’t be exactly 5 or 6 years, or even 5.5, but something more complicated. This would introduce an additional irregularity, analogous to skipping the leap day in century years not divisible by 400, but probably less elegant. The fact is, the numbers 7 and 365.2422 aren’t compatible with each other, and the Gregorian calendar seems to be the best way we know of to deal with it. (On a side note, the horoscope/astrology industry would absolutely HATE any kind of calendar reform!)

    @ Janet: I’m a bit puzzled about what you said regarding the leap year in 2000. In fact, rather than screwing things up, this continued the normal cycle of one leap year every 4 years. The year 2100 (not a leap year) will disrupt the exact 28-year cycle (of dates falling on the same day of the week) that we have now, as did the year 1900. However, not many people born in 1900 are still alive, and not many who are reading this will still be alive in 2100. So most of us have never experienced an interruption in the 4-year leap cycle, and never will. If the relation between your birthday and Labor Day is different now, I doubt it has anything to do with the leap year in 2000.

    The suggestion to eliminate time zones goes beyond laughable, in fact it’s truly outrageous. The underlying idea seems to be to have everybody around the world working “in sync”, so that all the major world markets (US, Europe, Asia) are doing business at the same time. That’s the whole point of a unified world time, isn’t it? In part of the world, people working in what are now “9 to 5 jobs” would have to work at night. That would mess with the natural body clock and put an arbitrarily defined group of people at a serious disadvantage (including harmful effects on health), based entirely on their longitude. The question of which longitude would correspond to a workday centered on local noon (the most favorable situation for most people) is so contentious that it might have to be settled with a world war.

    Several people have called for daylight savings time to be abolished. I would rather have DST all year long, but that’s just my preference, since I’m more of an evening person than a morning person, and would rather have the extra light at the end of the day. When I visited Hawaii (which has no DST) in the middle of summer, I was surprised at how early it got dark there compared to where I live (near Washington DC).

    Our current calendar has worked reasonably well for more than 400 years. Whatever economic benefits might result from calendar reform would be dwarfed by the negative social and personal consequences. Time zone reform, even on a local scale (e.g. the situation in Indiana with Eastern/Central Time and DST having different rules in different parts of the state), is politically controversial, and any suggestion to abolish time zones in favor of “unified world time” is just plain loony, for the reasons I explained above.

  25. Aviva H

    It is time for this change. Makes so much more sense! We are humans, we can adapt. After the “break in” period, it would be so much easier.

  26. Crayton

    As for what days would the leap days represent. And what about the irregularity of 5 or 6 years:

    Every 292nd week is doubled. This means if the third week of October is doubled then whether you are born on the first Wednesday of that doubled week or the second Wednesday, your birthday will always be the third Wednesday of October.

    I guess we could do that with the calender from this article, repeat December 25th through 31st, but there would still be that 5 or 6 year irregularity.

    Placing the doubled week after every 292nd week spreads the “leap week” across the entire calendar and allows for a very regular procession.

    This Henry-Hanke calendar explicitly ties itself to the Gregorian; while the Gregorian would still have its uses should the US or UN adopt a new calendar, the Henry-Hanke is automatically restricting itself from making the calendar more accurate by doing so.

  27. Albert Manfredi

    Wow, Eric, I hadn’t even considered this part that you wrote: “The underlying idea seems to be to have everybody around the world working ‘in sync,’ so that all the major world markets (US, Europe, Asia) are doing business at the same time.”

    If that’s truly what this calendar intends, then the idea is even more objectionable than what I had thought previously. Just like plants and animals, humans do function on a day-night cycle, and this should not be a huge revelation. Some people get downright disfunctional if they aren’t exposed to enough daylight.

  28. Jay Theo

    Eric, regarding your long Jan-27th post……UMmmmm…..I loved your considered reply, “…the numbers 7 and 365.2422 aren’t compatible…” I agree. You’d think that calender meister from past ages would have been more intuitive about that……but then they were also other brutal things.

    I feel sorry that you, Eric, as many here are, however, making a major mistake in your assumption which you adroitly put in colloquial terms when you said, “…That’s the whole point of a unified world time, isn’t it? In part of the world, people working in what are now “9 to 5 jobs” would have to work at night. That would mess with the natural body clock…”

    NO! But, No. Hear me out. Body clocks trump nearly every artificial clock. You assume that under UTC, where in the world it’s dark between 9 to 5, people would have to work. NO.

    People will continue doing what they’ve always done. When the sun comes up or *about* that time, they get up from their beds and prepare their day with the rising sun just as they’ve always done REGARDLESS WHAT NUMBERS THE BIG HAND AND LITTLE HAND OF CLOCKS POINT AT.

    THE SANE PRACTICE: when the sun rises so do you. Want to sleep-in because you’re a night watchman? Fine. Do so. That person may rise from their bed after the sun passes overhead. Fine.

    If you live in that part of the world where evening time means you tell your friends, “come over for the dinner barbeque at 900 hrs, then great.

    HERE’S THE POINT: as on my Jan-4th post: people in a mechanistic culture, divorced from the earth and it’s natural language, are too attached to numbers (on their clock) and not enough to their bodies.

  29. Albert Manfredi

    Jay, I think that maybe you misunderstood Eric’s point? As I read it, it was meant to be a “reduxio ad absurdum.”

    If not for the purpose Eric postulated, i.e. all businessa activities in sync, then my previous objection holds. With travel being so common these days, the system becomes a complete nuisance. When you arrive at your destination, you have no standard way of determining what the locals are up to in their daily cycle.

    Example. It’s dark when you arrive. You may surmise that if people are still out and about, it’s probably before, say, “midnight” (in our current vernacular). But exactly when? Can you go to a restaurant and expect to be served? Who knows?

    If there aren’t too many people around, is it the middle of the night, or is the sun about to come up? You don’t know that either. Not with the simple certainty that you have now, with time zones.

    You like the proposal? Go for it! Set your watch to GMT/UTC. You don’t need to wait for any new standard to be ratified.

  30. Helli


    Alle Menschen auf diesen Planeten werden sich freuen nach diesem kalender ihr Leben zu bestreiten.
    Dieser Kalender wird im Jahr 2012 erscheinen.
    Liebe grüsse Helli

  31. Mark

    I do think it is time for a calendar reform, but I think the International Fixed Calendar is a better choice. The Hanke -Henry would last a while, be just as much of a problem, then be changed again. The IFC is a much more mathematically accurate approach and better for businesses as well.

  32. Robert Erasmus

    I have a design for a permanent calendar based on 10 divisions of the year, which aligns better with other decimal units of measure. It also has each division begin on the first day of the week and end on the last day of the week, so reporting periods have the same number of work days and weekend days. My complete proposal is posted here: I’d appreciate hearing what you think.

  33. Bud S

    While the Hanke-Henry Calendar would be a big improvement over the Gregorian Calendar, I have found a calendar proposal that is even better: the Symmetry454 Calendar. It is a perpetual calendar that preserves the 7-day week, contains no “null” days (days without a day of the week or day of the month), and uses the “leap week” every 5 or 6 years. Under the Symmetry454 Calendar, every year, every month, and every week begin on a Monday and end on a Sunday. The 5th day of every month is a Friday, the 10th day of every month is a Wednesday, the 15th day of every month is a Monday, the 20th day of every month is a Saturday, and the 25th day of every month is a Thursday. January, March, April, June, July, September, October, and December have 28 days each; and February, May, August, and November have 35 days each. Every calendar quarter contains 91 days. For details, see

  34. Albert Manfredi

    Yes, but again, I can easily counter that the current system beats this Hanke-Henry too. Reason being, you have nothing as disruptive as a “leap week,” and you have nothing as inconsistent (which becomes disrupive as well) as some months with 28 days and others with 35 days. What a nightmare that would become.

    I’ve yet to see any proposal that is anything more than “different.” Each with its own disadvantages. The fundamental problem remains that the earth rotates around its axis at a speed that is not in perfect sync with the earth’s rotation around the sun (and why would anyone expect that anyway?). So different people try to come up with different compromises, which of course they always claim are more desirable. Our calendar now opts for slight adjustments on an ongoing basis. Other schemes force everything to me “more consistent” on a daily and weekly basis, which means they eventually have to pay the piper with big disruptions, because errors have been allowed to accumulate.

    You can’t fool mother nature.

  35. Fayyaz Ali Khan

    calendar reform is not a scientific problem instead it is more socio-religious one and should be solved accordingly. Your proposed calendar negates the historical and socio religious aspects of all universal calendars. However, my innovative calendar namely ‘the peoples era calendar’ is the ultimate solution of all calendar issues.

  36. Charlie

    Yes! Everyone can be the same! What a great idea! There needs to be more uniformity in the world. We should all conform to make business run more smoothly.

  37. Reese Matthews

    Most “calendar reform” is convoluted nonsense, usually done as someone’s pet project, driven by national or religious views. Keep the change simple and the world will accept a new calendar.

    (1) Change January 1 to the winter solstice, a common worldwide event. Why make it an arbitrary day over a week later?

    (2) Redistribute the days per month. Keep the current 365.241 day calendar with gradually shifting days, but with months of different length:

    January to May: 31 days (155 total)
    June to December: 30 days (210 total)
    Leap day: December 31

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