Are there locales or common programs that use YYYY-DD-MM as the date format?

0 votes
asked Feb 12, 2010 by bernard-chen

I've often standardized on YYYY-MM-DD as the date format for communicating within a geographically distributed project teams to dispel any ambiguity that might arise from local date formats.

Is it likely that I might run into people who are used to seeing dates as YYYY-DD-MM? Are there programs that use this as a date format?

6 Answers

0 votes
answered Feb 12, 2010 by rick-mogstad

There are none in the list of cultures in Windows that default to YYYY-DD-MM, so I would say you are pretty safe, in general, however since you can customize the dates, you should probably support it, if you want to be sure.

0 votes
answered Feb 12, 2010 by john

If you want to see exactly how daunting a task this is, look at all of the date formats available in Microsoft Excel 2007.

0 votes
answered Feb 12, 2010 by marc-s

See "Calendar date" on Wikipedia on the topic - it lists the countries by date/time format.

At first glance it doesn't look like anyone is using YYYY-DD-MM regularly.

0 votes
answered Feb 12, 2010 by davee

You should try to get your team(s) to standardize on ISO 8601 formatting, or use it and tell everyone that's what you're using. Or see Wikipedia's ISO 8601 reference.

0 votes
answered Feb 26, 2016 by tracker1

yyyy-mm-dd in particular is a subset of the ISO-8601 format.

There is no recognised standard that uses year date month. When year is first, it should always be followed by an appropriate sub-year, be that quarter, month, julian day, etc.

Some advantages to using year-first is that the order also happens to work well for alpha-sorting when used as a text value (such as part of a file name).

0 votes
answered Sep 15, 2017 by deantwo

According to Wikipedia Kazakhstan may use YYYY.DD.MM. I can't read the source for this information, so I don't know the specifics.

See: https://en.wikipedia.org/wiki/Date_format_by_country

That aside, I do believe that the delimiter still makes it visibly different from YYYY-MM-DD, so there should be no issue.

Example: 2017-01-13 vs 2017.13.01

As also mentioned by @Tracker1 and @DaveE, YYYY-MM-DD is the ISO-8601 standard format.

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