Joined: 03 Jan 2003 Posts: 1014 Topics: 13 Location: Atlantis
Posted: Sat Feb 15, 2003 12:41 pm Post subject:
Here is my stab at it. After some very basic tests of the format, I do one more comparison after converting the date in such a way that rexx handles the problem of Februrary in leap years.
Code:
/* Rexx - Date validation subroutine and driver */
val='20020231'
Say validDate(val)
Return
validDate: Procedure /* Return 1 for valid yyyymmdd, or 0 */
indate=Arg(1)
/* All numeric and correct length ? */
If translate(indate,'0000000000','0123456789') \= '00000000' Then
Return 0
/* Is month valid ? */
Parse Var indate yyyy 5 mm 7 dd
Say yyyy mm dd
If mm <1 | mm > 12 Then
Return 0
/* Now turn date into number of days, and back, then compare. */
/* This is done this way to let rexx worry about leap years */
/* and the number of days in each month */
base=date('B',yyyy||mm||'01','S')-1 /* Get date for 1st of month -1 */
newdate=date('S',base+dd,'B') /* Add day of month, convert back
to YYYYMMDD */
If newdate \= indate Then /* If new yyyymmdd doesn't match
original */
Return 0 /* Bad date - Day of month
invalid for this month */
Return 1 /* If we got here, it is valid */
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