I’m all for using standards for data representation, but this one is messed up. That same date can be written as:
- 2013-02-27
- 20130227
- 2013-58
- 201358
- 2013-W9-3
- 2013W93
And that’s before touching time zones.
Source: Wikipedia and and earlier revision of the standard, since the current revision costs $150.
I know this as MySQL date format. Just remember to strtotime it 😉