
num_days_difference — Calculates the number of days of difference between two dates
package require nstcltime ?1.0.1?
package require nstcl ?1.0?::nstcl::num_days_difference ?absolute_value? ?floor floor? ?ceiling ceiling? x y
This function calculates the number of days difference between two dates, x and y. Each date should be either an integer (the number of seconds since the epoch), or, a date (relative or absolute) in a format parseable by [clock scan].
 absolute_value
 If this switch is present, and the result is a negative number, then the absolute value will be returned instead.
 floor
 If a value for floor is given, and the calculated result is less than floor, then floor will be returned instead.
 ceiling
 If a value for ceiling is given, and the calculated result is more than ceiling, then ceiling will be returned instead.
nstcl, time