Tries to parse common variants of ISO-8601 datetime strings into a
#GstDateTime. Possible input formats are (for example):
2012-06-30T22:46:43Z, 2012, 2012-06, 2012-06-30, 2012-06-30T22:46:43-0430,
2012-06-30T22:46Z, 2012-06-30T22:46-0430, 2012-06-30 22:46,
2012-06-30 22:46:43, 2012-06-00, 2012-00-00, 2012-00-30, 22:46:43Z, 22:46Z,
22:46:43-0430, 22:46-0430, 22:46:30, 22:46
If no date is provided, it is assumed to be "today" in the timezone
provided (if any), otherwise UTC.
Tries to parse common variants of ISO-8601 datetime strings into a #GstDateTime. Possible input formats are (for example): 2012-06-30T22:46:43Z, 2012, 2012-06, 2012-06-30, 2012-06-30T22:46:43-0430, 2012-06-30T22:46Z, 2012-06-30T22:46-0430, 2012-06-30 22:46, 2012-06-30 22:46:43, 2012-06-00, 2012-00-00, 2012-00-30, 22:46:43Z, 22:46Z, 22:46:43-0430, 22:46-0430, 22:46:30, 22:46 If no date is provided, it is assumed to be "today" in the timezone provided (if any), otherwise UTC.