[ Version ( since = "2.62" ) ]
public string format_iso8601 ()
Format this in ISO 8601 format, including the date, time and time zone, and return that as a UTF-8 encoded string.
Since GLib 2.66, this will output to sub-second precision if needed.
| this |
A DateTime |
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a newly allocated string formatted in ISO 8601 format or null in the case that there was an error. The string should be freed with g_free. |