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Number of specific days in a month

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I'm working on building a new invoicing system. One of our billable items is an update that runs every Thursday. We bill on a monthly basis. What's the best way of calculating the number of Thursdays in a specified month?

As a part of some other calculations used in this model, I do have specific month (i.e. "August", "September") and year (i.e. "2010", "2011") fields. Piggybacking those would be great.

See if this helps:

http://fmforums.com/forum/topic/42318-week-number-of-month/page__p__197309#entry197309

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