The JoinHolidays command creates a new calendar obtained by joining holidays from the given two calendars. Any dates that are holidays in either of the given two calendars become holidays in the new calendar.

with(Finance):

Calendar1 := Calendar(Toronto):

Calendar2 := Calendar(Null);

$\mathrm{Calendar2}:=\mathbf{module}\left(\right)\mathbf{end\; module}$

AddHoliday(Calendar2, "January 4, 2006"):

IsHoliday("January 3, 2006", Calendar1);

$\mathrm{false}$

IsBusinessDay("January 3, 2006", Calendar1);

$\mathrm{true}$

IsHoliday("January 1, 2006", Calendar1);

$\mathrm{true}$

IsBusinessDay("January 1, 2006", Calendar1);

$\mathrm{false}$

Calendar3 := JoinHolidays(Calendar1, Calendar2):

IsHoliday("January 1, 2006", Calendar3);

$\mathrm{true}$

IsHoliday("January 4, 2006", Calendar3);

$\mathrm{true}$

RemoveHoliday("January 1, 2006", Calendar3):

IsHoliday("January 1, 2006", Calendar3);

$\mathrm{false}$

The Finance[JoinHolidays] command was introduced in Maple 15.

For more information on Maple 15 changes, see Updates in Maple 15.