The approach is sound. Devil is in the details, as usual. As for the rest of your question, it is a python, and not a web2py, issue. Read carefully the python doc on datetime. datetimes can be compared and you can add and subtract them. You can also create a datetime variable and set it to a certain # of seconds and then add or subtract that from an existing datetime variable. web2py's request.now will be essential to your implementation. Don't forget that you may have to compensate for time zones. Good luck. - Richard
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