Returns the number of hours in a duration.
fn:hours-from-duration( $arg as xs:duration?xs:integer?If $arg is the empty sequence, the function returns the empty sequence.
Otherwise, the function returns an xs:integer representing the hours
component in the value of $arg. Given that a duration
is a ($months, $seconds) tuple, the result is the value of ($seconds mod 86400) idiv 3600
.
If $arg is a negative duration then the result will be negative.
If $arg is an xs:yearMonthDuration the function returns 0.
The expression fn:hours-from-duration(xs:dayTimeDuration("P3DT10H")) returns 10.
The expression fn:hours-from-duration(xs:dayTimeDuration("P3DT12H32M12S")) returns 12.
The expression fn:hours-from-duration(xs:dayTimeDuration("PT123H")) returns 3.
The expression fn:hours-from-duration(xs:dayTimeDuration("-P3DT10H")) returns -10.