Cal
displays a simple calendar.
If arguments are not specified,
the current month is displayed.
The options are as follows:
-tag -width Ds
Fl m
Display Monday as the first day of the week.
(The default is Sunday.)
Fl j
Display Julian dates (days one-based, numbered from January 1).
Fl y
Display a calendar for the current year.
A single parameter specifies the year (1 - 9999) to be displayed;
note the year must be fully specified:
Li cal 89
will
not
display a calendar for 1989.
Two parameters denote the month (1 - 12) and year.
If no parameters are specified, the current month's calendar is
displayed.
A year starts on Jan 1.
The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd
of September.
By this time, most countries had recognized the reformation (although a
few did not recognize it until the early 1900's.)
Ten days following that date were eliminated by the reformation, so the
calendar for that month is a bit unusual.