Returns the number of days in a duration.
fn:days-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 days
component in the value of $arg. Given that a duration
is a ($months, $seconds) tuple, the result is the value of ($seconds idiv 86400)
.
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:days-from-duration(xs:dayTimeDuration("P3DT10H")) returns 3.
The expression fn:days-from-duration(xs:dayTimeDuration("P3DT55H")) returns 5.
The expression fn:days-from-duration(xs:yearMonthDuration("P3Y5M")) returns 0.