william strutts wrote: >Prodos has a date table which needs to be updated every seven years. Actually, the table is seven entries long (indexed into by day of week), but it can map only 5 or 6 years, depending on whether the range contains one or two leap years. Each leap year occupies two slots in the table. So if the first or second year is a leap year, then the fifth (probably!) also is, and they consume four slots, leaving only three other slots for the intervening non-leap years. If the first is a leap year, then five full years will be mapped. If the second is a leap year, then five full years will be mapped plus part of the sixth (the part before February 29). If the first or second year is not a leap year, then only one leap year falls in the range of the table, and five non-leap years can be accomodated for a total of six years. -michael Email: mjmahon@aol.com Home page: http://members.aol.com/MJMahon/