Here is what the FAQ on that site says: 
How do I do business week calculations?
TODO
:)

All other questions (besides a fiscal year begin date) that deal with business don't seem to be implemented. We most definitely need business and holiday functionality which DateTime doesn't seem to support. It does look like it knows a lot more about timezones and formats though.

I will check it out a little more, thank.

In reply to Re^2: Best Date Module for i18n by wtgee
in thread Best Date Module for i18n by wtgee

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