ISO datetime, let's goooooo YYYYMMDDHHmmSS
this post was submitted on 03 Aug 2026
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ISO-8601 or RFC-3339 is the way. It's not about which is better, but about that it would be confusing to use MMDDYYYY or DDMMYYYY since the other exists.
Month first is better because when someone says the date aloud, they start with the month "August 5th, 2026"
ISO 8601
YYYY-MM-DD
👆
This is the only way to date.
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As for why it's better:
- It's in sort order. Even if you use it for things that don't understand dates, they sort properly because the day is the last part, month is the middle part, and year is the first part. If you include hours, minutes or seconds, the sort order is still preserved.
- Speaking of things that don't understand dates, because there are no slashes, you can easily use it in file names, directories, and anything else that treats slash as a special character. In addition, if you include the time part, because it uses "T" to separate the date and time, it doesn't use a space, so once again it can be easily used anywhere where a space might cause issues.
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RFC 3339
ISO would be great, but sadly OmegaStar doesn't support ISO timestamps yet.
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FAIL
yyyy-mm-dd
Yep. Doing that joke and landing on anything but ISO-8601 would be a huge red flag for me.
Being able to sort numerically and have it also be in chronological order is sooo cool.
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YYYY-MM-DD
Yep and it needs to use hyphens and not slashes. It helps avoid missed typos or mis-reads in some situations, especially if hand-written.
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I read this meme and was physically revolted and wanted to immediately down vote. Great job.
The superior date format is, of course, ISO 8601. YYYY-MM-DD.
RFC3339 is better than ISO8601 since it doesn't allow some of the esoteric formats, and allows some useful formats that ISO8601 doesn't (like separating date and time by a space instead of by T)
For example, 2026-W32-1 is also a valid ISO8601 date: Monday on the 32nd week of 2026. That format isn't allowed with RFC3339.
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yyyy/mm/dd, it's less ambiguous and it sorts nicely
Edit: so many replies suggesting using a hyphen as a separator, I'd like to compromise by using the oblique angle sign (⦧) which looks like a slash that becomes a hyphen in the middle. yyyy⦧mm⦧dd
Beat me to it, except I’d do yyyy-mm-dd because some OSes throw fits about having slashes in file names. Way better than the “Group Project-final FINAL v3 PAUL USE THIS ONE.file” versioning system that people seem to use.
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ISO 8601 or gtfo
I feel like DD/MM/YYYY is the same as doing: ss:mm:HH and I find that confusing.
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YYYYMMDDHHMMSS
Please use any kind of separation character or I'm gonna lose my mind
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Anyone who wants to write the millennium between the month and century loses all credibility when arguing about date formats.
YYYY-MM-DD is the only coherent date format.
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ITT: people saying one thing is better than any other without thinking of context.
If I want to know today's date ISO 8601 isn't a good answer. And if I put stuff in folders by date then DD-MM-YYYY is a real bad way to do it.
But MM-DD-YYYY is the worst one no matter the context.
I like YYYY-MM-DD because then I don't have to figure out half the time if they used MM-DD-YYYY or if they were sane.
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The one that ends us with f... I mean ISO 8601 of course
Months are stupid anyway, lets drop them and swap for what they were supposed to represent instead: the moon phase, so today would be 216-2026-Waning Gibbous
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~~ISO 8601~~ RFC 3339 (yyyy-mm-dd) for storing dates in software. Any format that that goes in the order of day, month, and year for conversational/presentational purposes, preferable the format is dynamic depending on the user's locale (even for those that want the month first). There now everyone is happy.
Edit: switched to RFC 3339 since it is a subset of ISO 8601 that is more strict, and I love semantics.
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