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DateTime > Date with optional time (ISO 8601) Favorite

Source: http://www.pelagodesign.com/blog/2009/05/20/iso-8601-date-validation-that-doesnt-suck/

ISO 8601 Formatted Date with optional time.

Edited to remove most of the capturing sub groups. The 2 remaining are necessary for backreferences.

Sample Matches

Text	Result
`2009-12T12:34` Group #0 `2009-12T12:34` Group #1 `-` Group #2 `:`	match
`2009` Group #0 `2009`	match
`2009-05-19` Group #0 `2009-05-19` Group #1 `-`	match
`2009-05-19` Group #0 `2009-05-19` Group #1 `-`	match
`20090519` Group #0 `20090519` Group #1	match
`2009123` Group #0 `2009123` Group #1	match
`2009-05` Group #0 `2009-05` Group #1 `-`	match
`2009-123` Group #0 `2009-123` Group #1 `-`	match
`2009-222` Group #0 `2009-222` Group #1 `-`	match
`2009-001` Group #0 `2009-001` Group #1 `-`	match
`2009-W01-1` Group #0 `2009-W01-1` Group #1 `-`	match
`2009-W51-1` Group #0 `2009-W51-1` Group #1 `-`	match
`2009-W511` Group #0 `2009-W511` Group #1 `-`	match
`2009-W33` Group #0 `2009-W33` Group #1 `-`	match
`2009W511` Group #0 `2009W511` Group #1	match
`2009-05-19` Group #0 `2009-05-19` Group #1 `-`	match
`2009-05-19 00:00` Group #0 `2009-05-19 00:00` Group #1 `-` Group #2 `:`	match
`2009-05-19 14` Group #0 `2009-05-19 14` Group #1 `-`	match
`2009-05-19 14:31` Group #0 `2009-05-19 14:31` Group #1 `-` Group #2 `:`	match
`2009-05-19 14:39:22` Group #0 `2009-05-19 14:39:22` Group #1 `-` Group #2 `:`	match
`2009-05-19T14:39Z` Group #0 `2009-05-19T14:39Z` Group #1 `-` Group #2 `:`	match
`2009-W21-2` Group #0 `2009-W21-2` Group #1 `-`	match
`2009-W21-2T01:22` Group #0 `2009-W21-2T01:22` Group #1 `-` Group #2 `:`	match
`2009-139` Group #0 `2009-139` Group #1 `-`	match
`2009-05-19 14:39:22-06:00` Group #0 `2009-05-19 14:39:22-06:00` Group #1 `-` Group #2 `:`	match
`2009-05-19 14:39:22+0600` Group #0 `2009-05-19 14:39:22+0600` Group #1 `-` Group #2 `:`	match
`2009-05-19 14:39:22-01` Group #0 `2009-05-19 14:39:22-01` Group #1 `-` Group #2 `:`	match
`20090621T0545Z` Group #0 `20090621T0545Z` Group #1 Group #2	match
`2007-04-06T00:00` Group #0 `2007-04-06T00:00` Group #1 `-` Group #2 `:`	match
`2007-04-05T24:00` Group #0 `2007-04-05T24:00` Group #1 `-`	match
`2010-02-18T16:23:48.5` Group #0 `2010-02-18T16:23:48.5` Group #1 `-` Group #2 `:`	match
`2010-02-18T16:23:48,444` Group #0 `2010-02-18T16:23:48,444` Group #1 `-` Group #2 `:`	match
`2010-02-18T16:23:48,3-06:00` Group #0 `2010-02-18T16:23:48,3-06:00` Group #1 `-` Group #2 `:`	match
`2010-02-18T16:23.4` Group #0 `2010-02-18T16:23.4` Group #1 `-` Group #2 `:`	match
`2010-02-18T16:23,25` Group #0 `2010-02-18T16:23,25` Group #1 `-` Group #2 `:`	match
`2010-02-18T16:23.33+0600` Group #0 `2010-02-18T16:23.33+0600` Group #1 `-` Group #2 `:`	match
`2010-02-18T16.23334444` Group #0 `2010-02-18T16.23334444` Group #1 `-`	match
`2010-02-18T16,2283` Group #0 `2010-02-18T16,2283` Group #1 `-`	match
`2009-05-19 143922.500` Group #0 `2009-05-19 143922.500` Group #1 `-` Group #2	match
`2009-05-19 1439,55` Group #0 `2009-05-19 1439,55` Group #1 `-` Group #2	match
`200905`	no match
`2009367`	no match
`2009-`	no match
`2007-04-05T24:50`	no match
`2009-000`	no match
`2009-M511`	no match
`2009M511`	no match
`2009-05-19T14a39r`	no match
`2009-05-19T14:3924`	no match
`2009-0519`	no match
`2009-05-1914:39`	no match
`2009-05-19 14:`	no match
`2009-05-19r14:39`	no match
`2009-05-19 14a39a22`	no match
`200912-01`	no match
`2009-05-19 14:39:22+06a00`	no match
`2009-05-19 146922.500`	no match
`2010-02-18T16.5:23.35:48`	no match
`2010-02-18T16:23.35:48`	no match
`2010-02-18T16:23.35:48.45`	no match
`2009-05-19 14.5.44`	no match
`2010-02-18T16:23.33.600`	no match
`2010-02-18T16,25:23:48,444`	no match