DateTime is a heavyweight module, but unless I hit some memory or speed problems, I always use it. Once you have your datetimee field parsed into a DateTime-object, you can do so much with it. In the beginning it may seem overkill, but as your application grows and grows, it is likely you will hit some limits with other datetime representations and then you will have to go back and refactor everything.
CountZero
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
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Imperial Deltronics
