from preamble:

"Change Set:		date fixes
Date:			31 January 2003
Author:			Stephan B Wessels

By default weeks begin on Monday in Squeak and code exists to toggle
between Sunday start
and Monday start.  This change set adds a explicit setting methods for
the start of week day.

There were a few places in the code where proper adjustment to Sunday
beginning weeks were not correct.  The Date #weekday math was corrected
to account for Monday/Sunday week start.
Month has a new #weeksInMonth method.
Week #indexInMonth: method was also fixed.

Note that the MonthMorph still works correctly since it coded around
this.

Wrote some SUnit tests for Date and Week."!
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