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 DATE

 The Date category provides many functions for dealing with dates
 and includes functions to convert the day, month, or year to a
 character string.  The two functions C_DATECAT() and C_DATESCAT()
 concatenate a day, month, and year and return a complete date or
 character string.  There are functions that handle date math by
 allowing a specified number of days, months, or years to be added
 or subtracted from a date.  Additionally, there are routines to
 determine the elapsed time between two dates, return the last day
 of a month, and to determine if a given date or year is a leap
 year.

 C_DATECAT()         C_ADAYS()
 C_DATESCAT()        C_AMONTHS()
 C_ISLEAP()          C_AYEARS()
 C_SDAY()            C_EDAYS()
 C_SMONTH()          C_EMONTHS()
 C_SYEAR()           C_EYEARS()
 C_SYY()             C_LASTDAY()