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LIB$DAY_OF_WEEK

   The Show Numeric Day of Week routine returns the numeric day of
   the week for an input time value. If 0 is the input time value,
   the current day of the week is returned. The days are numbered 1
   through 7, with Monday as day 1 and Sunday as day 7.

   Format

     LIB$DAY_OF_WEEK  [user-time,] day-number

Additional information available:

Returns         Arguments