hi chuck, the modification time is store in the filesystem, for the more paranoid you can use dnotify() an become informed when ever the dir is used. fast way is to store a checksum e.g. md5 and compare after a notify event. walter - - - - - - - - - - - - - - Originalnachricht - - - - - - - - - - - - - - Von: Chuck Soper <chucks@lmi.net> Betreff: utility creating a dst cache Datum: 01.08.03 21:43 Hello, I'm writing a utility that uses the tz database. One of the features is to quickly (via a cache saved to disk) display daylight saving times for a given year and tz location. If the tz package is updated then I will need to re-create my dst cache. Is there a way to programmatically determine if the tz package has been updated since the last time I ran my utility? Is there a way to determine if a specific zoneinfo file has been updated? Thanks, Chuck