Determine If Row In File Is Date

Jun 13, 2011

When scanning a data file of this kind of form:

21/02/11 11:00:23, true, false
22/02/11 02:03:43 AM, true, false
22/03/11, false, false
2011-05-21T12:30:20, true, true

The 2nd and 3rd row are not important. How can you, by scanning a file, determine if a row comprises of dates, particularly when they have inconsistent formats? In the example above, for instance:

1) 1st line is date and time
2) 2nd line is date and time but also AM/PM
3) 3rd line is only date
4) 4th line is GMT format.

I'm not requesting code, but perhaps an algorithm or some guidelines on how to achieve this.

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