Arguments

 

user-time

   OpenVMS usage:date_time
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by reference

   Time to be translated to a day of the week, or zero. The
   optional user-time argument is the address of an unsigned
   quadword containing the value of time. Time must be supplied
   as an absolute system time. To obtain this time value in proper
   quadword format, call the $BINTIM system service.

   If time is passed as zero by value, the numeric value for
   the current day is returned. If time is passed as a zero by
   reference, the number returned represents the day of November
   17, 1858. If the user-time argument is omitted, it is equivalent
   to passing a zero by value.
 

day-number

   OpenVMS usage:longword_unsigned
   type:         longword (unsigned)
   access:       write only
   mechanism:    by reference

   Numeric day of week. The day-number argument is the address of
   a longword into which LIB$DAY_OF_WEEK writes the integer value
   representing the day of the week.