fn.timezoneFromTime( $arg as String? ) as xs.dayTimeDuration?
Returns the timezone component of $arg if any. If $arg has a timezone component, then the result is an xs:dayTimeDuration that indicates deviation from UTC; its value may range from +14:00 to -14:00 hours, both inclusive. Otherwise, the result is the empty sequence.
If $arg is the empty sequence, returns the empty sequence.
|$arg||The time whose timezone component will be returned.|
fn.timezoneFromTime(xs.time("13:20:00-05:00")) => xs.dayTimeDuration whose value is -PT5H
fn.timezoneFromTime(xs.time("13:20:00")) => ()