Sometimes the calendar governing a financial contract is defined by multiple
single locales. These joint calendars are represented by the JointCalendar
class.
Usage
JointCalendar(calendars, rule = all)
Arguments
calendars
a list of at least one Calendar() objects
rule
either all or any corresponding to a date being good if
it is good in all or any of the calendars supplied.
Value
an object of class JointCalendar when using JointCalendar()