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Currently I put the date in my document using: \date{\today}

How do I display the date in the YYYY-MM-DD format?

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See here From the documentation (pg 10) we have The option yyyymmdd makes \today produce YYYY/MM/DD date – Sigur Jan 4 '14 at 13:30

5 Answers 5

up vote 42 down vote accepted

edit: As noted by @Sean Allred, datetime has been superseded by datetime2.

Using the package datetime with the option yyyymmdd as


you just change the value of \dateseparator to replace the default / by - (or -- if you want).


Also as noted by @Vincent, you can define your own date format.

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Somebody should check whether ISO 8601 says that the separator has to be - or --. ( Definitely YYYY/MM/DD should not be used - that would violate the standard. Keith – KeithB Jan 8 '14 at 9:53
@KeithB, Wikipedia claims, “The separator used between date values (year, month, week, and day) is the hyphen”. Also, it’s unlikely the standard mandates characters encoded neither in EBCDIC nor ASCII. – J. C. Salomon Jan 13 '14 at 19:20
note: datetime has been superseded by datetime2 – Sean Allred Apr 6 at 17:38
Sigur is correct. However, note that the datetime package must come after the babel package. Babel seems to change the format as well. – qznc Sep 2 at 12:34

According to the link of Sigur:

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Use the package isodate


It offers various options (and needs one of its language options) and commands to change the date format.

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Use the package datetime2


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This should be an edit to the other answers using datetime since datetime is now superseded and should no longer be used for new documents. – Paul Gessler Apr 6 at 17:55

My solution needs no packages. The only thing you need to know is that the primitive registers \day, \month and \year include the desired information:

\def\twodigits#1{\ifnum#1<10 0\fi\the#1}

The date in my format: \mydate.
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