fn.timezoneFromDate( $arg as Date? ) 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 date whose timezone component will be returned.|
fn.timezoneFromDate(xs.date("1999-05-31-05:00")) => the xs.dayTimeDuration whose value is -PT5H
fn.timezoneFromDate(xs.date("2000-06-12Z")) => the xs.dayTimeDuration with value PT0H