javascript regex iso datetime

Question

does anyone have a good regex pattern for matching iso datetimes?

ie: 2010-06-15T00:00:00

Answer 1

For the strict, full datetime, including milliseconds, per the W3C's take on the spec.:

//-- Complete precision:
/d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d.d+([+-][0-2]d:[0-5]d|Z)/

//-- No milliseconds:
/d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d([+-][0-2]d:[0-5]d|Z)/

//-- No Seconds:
/d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d([+-][0-2]d:[0-5]d|Z)/

//-- Putting it all together:
/(d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d.d+([+-][0-2]d:[0-5]d|Z))|(d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d([+-][0-2]d:[0-5]d|Z))|(d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d([+-][0-2]d:[0-5]d|Z))/

.
Additional variations allowed by the actual ISO 8601:2004(E) doc:

/********************************************
**    No time-zone varients:
*/
//-- Complete precision:
/d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d.d+/

//-- No milliseconds:
/d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d/

//-- No Seconds:
/d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d/

//-- Putting it all together:
/(d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d.d+)|(d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d:[0-5]d)|(d{4}-[01]d-[0-3]dT[0-2]d:[0-5]d)/

WARNING: This all gets messy fast, and it still allows certain nonsense such as a 14th month. Additionally, ISO 8601:2004(E) allows a several other variants.

.
"2010-06-15T00:00:00" isn't legal, because it doesn't have the time-zone designation.