I agree with others that in most cases, you're better off sticking with the ISO 8601 definitions. But, just in case you're interested, Date::Manip defaults to ISO 8601, but you can specify other definitions of week using some of the config variables that are built in. For example:

Most of the time I would discourage using these... but they are there if you need them.

In reply to Re^2: Another date question by SBECK
in thread Another date question by sshingor

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