Many of the kadmin commands take a duration or time as an
argument.  The date can appear in a wide variety of formats, such as:
     "15 minutes"
     "7 days"
     "1 month"
     "2 hours"
     "400000 seconds"
     "next year"
     "this Monday"
     "next Monday"
     yesterday
     tomorrow
     now
     "second Monday"
     fortnight
     "3/31/1992 10:00:07 PST"
     "January 23, 2007 10:05pm"
     "22:00 GMT"
     
Note that if the date specification contains spaces, you must enclose it in double quotes. Note also that you cannot use a number without a unit. (I.e., ""60 seconds"" is correct, but "60" is incorrect.) All keywords are case-insensitive. The following is a list of all of the allowable keywords.
kadmin recognizes abbreviations for most of the world's time
zones.  A complete listing appears in kadmin Time Zones.