Sara - You should look at perldoc.perl.org for the date-time related functions. You don't really need any special modules, though they can sometimes be helpful. Here is a key idea: dates in perl (and many other computer languages & systems) are stored as an integer number that represents the number of _seconds_ since "the epoch" (usually Jan 1, of 1970 when dealing with UNIXy things). Now if each day has 60 seconds per minute and 60 minutes per hour and 24 hours per day, you can figure out how many seconds per day there are, and just add that number of seconds to a running date-time variable to advance to the next day. Now just combine that idea with the useful built-in date and time functions and you are all set. I must stress that you must read the documentation on the functions, they don't work in an entirely intuitive way, but once you understand the details you will see that they are very useful and flexible. - Anagram
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