fn.secondsFromDateTime( $arg as Date? ) as Number?
Returns an xs:decimal value between 0 and 60.999..., both inclusive representing the seconds and fractional seconds in the localized value of $arg. Note that the value can be greater than 60 seconds to accommodate occasional leap seconds used to keep human time synchronized with the rotation of the planet.
If $arg is the empty sequence, returns the empty sequence.
|$arg||The dateTime whose seconds component will be returned.|
fn.secondsFromDateTime( xs.dateTime("1999-05-31T13:20:00-05:00")) => 0