this post was submitted on 27 Jun 2026
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You Should Know

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You should know this ahead to fully enjoy that beauty of compact, mathematically sound week chart, and perhaps the accompanying momentary illusion that world makes sense again.

The next opportunity to enjoy most compact possible calendar page will be in 2038, so don't miss it!

(Bonus: if you notice that 1st week is week 5 so apparently January 2027 also has 4 weeks--what gives? That's because in ISO week numbering, first three days of January 2027 count as week 53 of 2026. In other words, week 1 of 2027 starts on January 4th.)

If your calendar starts with Sunday, this past February of 2026 was actually compact, and the next one is in 2037.

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[–] Wildone@sh.itjust.works 51 points 2 days ago (3 children)

The way all months should be! There's a calendar that does this for 13 months with one extra day for new years. But our society is too busy killing each other over money to switch to it.

[–] netvor@lemmy.world 9 points 2 days ago (1 children)

IMHO months add unnecessary complexity. In my own experimental calendar I use normal Gregorian year with ISO week numbers and then instead of months, I define seven "seasons" which are just 8-week periods (week 1 to 8, 9 to 16, etc.). Each season has 56 (8 x 7) days except for season 7, which is the only one that absorbs all the irregularities and typically has 29 days.

It could be pretty similar to 13-month calendar you described, but I decided to use larger unit and also remove ambiguity about meaning of "month" (all other units means the same thing as in Gregorian + ISO-week-numbering)---by simply abandoning that unit entirely.

[–] netvor@lemmy.world 3 points 2 days ago* (last edited 2 days ago) (1 children)

(By the way, I always wanted to give these seasons names but my mind just goes blank whenever I try. I'm not very creative, I guess.)

[–] gex@lemmy.world 5 points 2 days ago (1 children)
[–] netvor@lemmy.world 1 points 2 days ago

I was thinking of Crystal systems which would be cool because there's 6 or 7 depending on convention. The only problem is that the "Monoclinic" would have 3-letter abbreviation of "Mon" which could be confused with abbreviation for Monday---I would challenge myself to find a way around it.

The XKCD thing is also great start. Continents would be nice, main-stream way of going about it. (I'm hopeful that people of Antarctica would not feel ripped off if they got the 7th season.)

[–] tanisnikana@lemmy.world 7 points 2 days ago (1 children)

Once that gets implemented, I know I’m gonna pay for everything 13 times instead of twelve.

Oh wait, yeah, “killing each other over money.”

[–] Gold_E_Lox@lemmy.dbzer0.com 2 points 2 days ago

most pay cycles for me are 28 days anyway

[–] tiny_hedgehog@piefed.social 4 points 2 days ago (2 children)

How dare you? Our society is not JUST killing each other over money! We’re also killing each other to distract from the fact that the world is run by pedophiles. Please get your facts straight!

[–] Zwiebel@feddit.org 4 points 2 days ago (1 children)

*Pedophile rapists. Important difference

[–] tiny_hedgehog@piefed.social 2 points 2 days ago

Thank you for the important clarification.

[–] Wildone@sh.itjust.works 3 points 2 days ago

My bad! Release the files! Jail the pedos and their protectors!

[–] Etterra@discuss.online 5 points 2 days ago (1 children)

If we switched to a 13 month calendar then every month but the last one could be exactly 4 weeks. long, but noooo, it's unlucky/can't be divided clearly/some other stupid excuse.

[–] Jela@lemmy.today 3 points 2 days ago

Le sigh.. maybe someday

[–] Spooge@lemmy.world 12 points 2 days ago

Autistic people everywhere are so excited!

[–] fahfahfahfah@lemmy.billiam.net 20 points 2 days ago (1 children)

My autistic child who is obsessed with dates will love this fact

[–] birdwing@lemmy.blahaj.zone 6 points 2 days ago* (last edited 2 days ago)
[–] NOT_RICK@lemmy.world 14 points 2 days ago

This is more mildly interesting than YSK, OP.

[–] kshade@lemmy.world 7 points 2 days ago

Finally some good news, 2027 is going to be a good one!

[–] CultLeader4Hire@lemmy.world 8 points 2 days ago (1 children)

I wish every month was like this but I’m too bad at math to understand why it can’t be lol

[–] Zwiebel@feddit.org 6 points 2 days ago* (last edited 2 days ago) (1 children)

Because the length of most months are not multiples of 7. Thirty days divides into four weeks and a remainder of two

We could make every month 28 days, exactly four weeks, then it would work

[–] yermaw@sh.itjust.works 3 points 2 days ago

I think thats what he meant.

We made the calender. We did this shit to ourselves.

[–] kbal@fedia.io 4 points 2 days ago (4 children)

Does anyone actually use calendars that put Monday on the left? Not where I live but I haven't seen the calendars of most of the world.

[–] omawarisan@lemmy.world 10 points 2 days ago

Roughly 160 countries (about 3.3 billion people) start the week on Monday. Virtually all European countries follow ISO 8601 and have adopted Monday as their start of the week

https://www.timeanddate.com/calendar/days/first-day-of-the-week.html

[–] netvor@lemmy.world 5 points 2 days ago

Hell yeah! And I'm confused af when Sunday happens to be on the left.

I live in Czechia (born in Slovakia) and you won't see Sunday-first calendars around here unless they are imported. (I bet lot of people even don't know that in some calendars in the world Monday is not the first!)

[–] palordrolap@fedia.io 8 points 2 days ago (1 children)

You'll find both Sunday-first and Monday-first calendars here in Britain, though I couldn't tell you the ratio and popularity of each.

I'm usually given one as a Christmas gift and that particular make are usually Monday-first, but last year's was Sunday-first for the first time in ages, which took me by surprise.

Also, my computer preference is Monday first wherever it can be set.

That might derive from locale settings, but I've carried over configs for literally decades at this point, so I couldn't tell you for sure.

[–] CultLeader4Hire@lemmy.world 2 points 2 days ago

I never knew this! I’ve never in my life seen a Monday first calendar in the US

[–] flyos@jlai.lu 3 points 2 days ago

Virtually all calendars do so in France.

[–] alternategait@lemmy.world 2 points 2 days ago

This is fun. I have an event that I have monthly that I time by writing in the 4th Sunday cell and then wherever that lands in the month is where it is. I guess next year it will actually be 4th Sundays.

[–] AllNewTypeFace@leminal.space 2 points 2 days ago

that looks nice and kentucky