Calculates when 66 holidays occur in any given year BC
or AD. Designed to be cannibalised to include the
calculation routines in your own programs.
It includes the following

New Years Day
Congress Start Day
Martin Luther King Day
Inauguration Day
Robbie Burns Day
Australia Day
Groundhog Day
Mardi Gras
Ash Wednesday
Lincoln's Birthday
Valentines Day
Presidents Day
Alberta Family Day
Washington's Birthday
Commonwealth Day
Daylight Savings Day
St Patrick's day
Vernal Equinox
Palm Sunday
Good Friday
Earth Hour
April Fools Day
Earth Day
Easter Sunday
Easter Monday
ANZAC Day
Cinco de Mayo
Europe Day
Mothers Day
Armed Forces Day
Victoria Day
Memorial Day
Change Your Password Day
Australia Queen's Birthday
Fathers Day
Summer Solstice
Aboriginal Day
St Jean-Baptiste Day
Canada Day
Independence Day
Utah Pioneer Day
Parents' Day
Canada Civic Day
Canadian Labour Day
American Labor Day
Grandparents Daay
Autumnal Equinox
Canadian Thanksgiving
Columbus Day
Creationism Day
Halloween
Daylight Savings End
General Election Day
Remembrance Day
Veterans Day
American Thanksgiving
Black Friday
St. Andrews Day
World AIDS Day
Human Rights Day
Winter Solstice
Christmas Eve
Christmas
Christmas in the USA
Boxing Day
New Years Eve

If a holiday was not celebrated in a given year, it will not
show.

Includes complete Java source code to calculate when the
holiday occurs in a given year, when it was first
celebrated, when first proclaimed, the rule for how it is
calculated in words and an authority to go to for more
information.

Also calculates the nearest weekday to any given holiday,
when you actually get the day off. This is what I refer to
by the term shifted. Boxing day has special shift
handling.