This module allows you to output calendars like the Unix
cal program, and provides additional useful functions related to the
calendar. By default, these calendars have Monday as the first day of the week, and Sunday as
the last (the European convention). Use setfirstweekday() to set the
first day of the week to Sunday (6) or to any other weekday. Parameters that specify dates are
given as integers.
Most of these functions rely on the datetime module which uses an
idealized calendar, the current Gregorian calendar indefinitely extended in both directions.
This matches the definition of the "proleptic Gregorian" calendar in Dershowitz and
Reingold's book "Calendrical Calculations", where it's the base calendar for all
computations.

setfirstweekday( 
weekday) 
 Sets the weekday (
0 is Monday, 6 is Sunday) to start each
week. The values MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY,
SATURDAY, and SUNDAY are provided for
convenience. For example, to set the first weekday to Sunday:
import calendar
calendar.setfirstweekday(calendar.SUNDAY)
New in version 2.0.

 Returns the current setting for the weekday to start each week. New in version 2.0.

 Returns
1 if year is a leap year, otherwise 0 .

 Returns the number of leap years in the range [y1...y2), where y1
and y2 are years. Changed in version 2.0: This
function didn't work for ranges spanning a century change in Python 1.5.2.

weekday( 
year, month, day) 
 Returns the day of the week (
0 is Monday) for year (1970 ...),
month (1 12 ), day (1 31 ).

 Returns weekday of first day of the month and number of days in month, for the specified
year and month.

monthcalendar( 
year, month) 
 Returns a matrix representing a month's calendar. Each row represents a week; days
outside of the month a represented by zeros. Each week begins with Monday unless set by setfirstweekday().

prmonth( 
theyear, themonth[, w[, l]]) 
 Prints a month's calendar as returned by month().

month( 
theyear, themonth[, w[, l]]) 
 Returns a month's calendar in a multiline string. If w is provided, it
specifies the width of the date columns, which are centered. If l is given, it
specifies the number of lines that each week will use. Depends on the first weekday as set
by setfirstweekday(). New in version
2.0.

prcal( 
year[, w[, l[c]]]) 
 Prints the calendar for an entire year as returned by calendar().

calendar( 
year[, w[, l[c]]]) 
 Returns a 3column calendar for an entire year as a multiline string. Optional
parameters w, l, and c are for date column width, lines
per week, and number of spaces between month columns, respectively. Depends on the first
weekday as set by setfirstweekday(). The earliest year for which
a calendar can be generated is platformdependent. New in
version 2.0.

 An unrelated but handy function that takes a time tuple such as returned by the gmtime() function in the time module, and returns the corresponding Unix timestamp value, assuming an epoch of 1970,
and the POSIX encoding. In fact, time.gmtime() and timegm() are each others' inverse. New in
version 2.0.
See Also:
 Module time:
 Lowlevel time related functions.
