Returns a new DateTime object, created from a string in extended ISO format yyyy-mm-ddThh:mm:ss.uuuuuu.

The isoDate and the string methods return a string in extended ISO format as the string form of a DateTime instance.

If specified, offset is the offset from UTC, in minutes. The offset must be a valid whole number between -900 and 900 or an equivalent TimeSpan instance. The default offset is the current system timezone offset.