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.
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.
Why? dd/mm/yyyy isnt practical. If you are asking someone to check out part of a book, you wouldn't say "paragraph 4, chapter 3", you start broad and become more specific. Calendars, at least in the US, are organized by month. You have turn turn to the month page before finding the date, it makes more sense to say month first because its the first piece of information that you need (unless its a more rare case that you are talking about an event in another year).
Im sure programmers prefer something different, but humans shouldn't have to communicate differently to make computing easier. Computing exists to make human life easier, not the other way around.
mm/dd/yyyy is horrendous and inconsistent, you can argue that yyyy/mm/dd is correct, but for daily use dd/mm/yyyy is way better
What is inconsistent about it? That's a weird argument against its use.
I like it because it's in order of smallest maximum integer. I know that's not why we use it in the US but it's still satisfying to me to see the first number smaller than the second on all but 78 days of the year.
ISO 8601
YYYY-MM-DD
👆
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.
ISO is better for archiving and sorting, inarguably so. But dd-mm-yyyy is better for day to day daily life usage, where the day and month are much more important than the year.
Both have their uses, but for different situations. mm-dd-yyyy is just batshit though.

Month first is better because when someone says the date aloud, they start with the month "August 5th, 2026"
FAIL
yyyy-mm-dd
ISO 8601!
Bear in mind that
YY-MM-DD or YYMMDD
-YY-MM or -YYMM
--MM-DD or --MMDD
--MM
---DD
are all valid 8601
Long live the 8601
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.
ISO 8601 or gtfo
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.
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
The one that ends us with f... I mean ISO 8601 of course
YYYYMMDDHHMMSS
Please use any kind of separation character or I'm gonna lose my mind
I feel like DD/MM/YYYY is the same as doing: ss:mm:HH and I find that confusing.
I wish US Americans would do this, but when I try to use it, it's too ambiguous with our mm/dd/yyyy format that already exists. So, I think the US will have to go with YYYYMMDD. That's the most straightforward and easy to understand method of switching to an entirely numeric date sequence that is logical.
Year day month is the only acceptable format.
so how's the murder rate in heathen land
I meant to say i love month-day-year. August 5, 2026. I love day-month-year too, more than I like month-day-year
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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