us holidays
* Daylight saving time ends @d 2009-11-01 @r y @M 11 @w SU(1)
* Daylight saving time begins @d 2010-03-14 @r y @M 3 @w SU(2)
* Thanksgiving @d 2009-11-26 @r y @M 11 @w TH(4)
* Christmas @d 2009-12-25 @r y @M 12 @m 25
* Memorial Day @d 2010-05-31 @r y @M 5 @w MO(-1)
* Martin Luther King Day @d 2010-01-18 @r y @M 1 @w MO(3)
* Valentine's Day @d 2010-02-14 @r y @M 2 @m 14
* President's Day @d 2010-02-15 @r y @M 2 @w MO(3)
* St Patrick's Day @d 2010-03-17 @r y @M 3 @m 17
* Easter @r l @l (2010-04-04, 2011-04-24, 2012-04-08, 2013-03-31)
* Mother's Day @d 2010-05-09 @r y @M 5 @w SU(2)
* Father's Day @d 2010-06-20 @r y @M 6 @w SU(3)
* Independence Day @d 2010-07-04 @r y @M 7 @m 4
* Labor Day @d 2010-09-06 @r y @M 9 @w MO(1)