Uwe, You can package anything as your own 'single' command, but the only sensible way to do what you want to do is to convert your year-month-day Gregorian-calendar date into a day number, subtract one, and convert the difference back into a year-month-day value.
There are library routines that perform the conversions YMD==>GDN, GDN==>YMD, you will have to subtract the one yourself. John Gilmore, Ashland, MA 01721 - USA ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
