getUtcTimeZoneIdentifier abstract method
Returns the identifier for the UTC time zone.
The identifier for the UTC time zone is a string in the format "Etc/GMT+/-
hh:mm",
where "+/-
hh:mm" represents the time zone offset from UTC. For example, the
identifier for the UTC time zone commonly is "UTC".
This method returns a Future that resolves to a String value containing the UTC time zone identifier.
Implementation
Future<String> getUtcTimeZoneIdentifier();