parse
Parses a string that represents an offset in an ISO-8601 time shift extended format, also supporting specifying the number of seconds or not specifying the number of minutes.
Examples of valid strings:
Z
or+00:00
, an offset of zero;+05
, five hours;-02
, minus two hours;+03:30
, three hours and thirty minutes;+01:23:45
, an hour, 23 minutes, and 45 seconds.