Python Calendar Module

Compatibility

This code was written to support Python 3.x and above. It does not support Python 2.x.

Usage examples

is_leap_year(year)

>>> is_leap_year(2004) 
True
>>> is_leap_year(1900)
False 

is_valid_date(month, date, year)

>>> is_valid_date(2, 31, 2013)
False
>>> is_valid_date(7, 31, 2019)
True

get_days_in_month

>>> get_days_in_month(2, 2008)
29
>>> get_days_in_month(8, 2009)
31

determine_day('mm/dd/yyyy')

 
>>> determine_day('07/06/1990')  # my birthday
Friday
>>> determine_day('01/01/2039')
Saturday

find_start_day_of_month(month, year)

>>> find_start_day_of_month(12, 1964)  # The first day of December in 1964 was the 2nd.
2  

find_start_day_of_month_2(month, year)

>>> find_start_day_of_month_2(12, 1964)  # same functionality as find_start_day_of_month(month, year) but faster
2

draw_month(month, year)

Note: This function does NOT return a value. It just prints a user-friendly visual of the specified month in the command line.

>>> draw_month(7, 1995)
July 1995
Sun   Mon   Tue   Wed   Thu   Fri   Sat
                                      1   
2     3     4     5     6     7     8
9    10    11    12    13    14    15
16    17    18    19    20    21    22
23    24    25    26    27    28    29
30    31

draw_year(year)

Note: This function does NOT return a value. It just prints a user-friendly visual of the specified year's calendar in the command line.

>>> draw_year(2009)
January 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
                          1     2     3   
4     5     6     7     8     9    10
11    12    13    14    15    16    17
18    19    20    21    22    23    24
25    26    27    28    29    30    31
February 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4     5     6     7
8     9    10    11    12    13    14
15    16    17    18    19    20    21
22    23    24    25    26    27    28
March 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4     5     6     7
8     9    10    11    12    13    14
15    16    17    18    19    20    21
22    23    24    25    26    27    28
29    30    31
April 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4
5     6     7     8     9    10    11
12    13    14    15    16    17    18
19    20    21    22    23    24    25
26    27    28    29    30
May 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2
3     4     5     6     7     8     9
10    11    12    13    14    15    16
17    18    19    20    21    22    23
24    25    26    27    28    29    30
31
June 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4     5     6
7     8     9    10    11    12    13
14    15    16    17    18    19    20
21    22    23    24    25    26    27
28    29    30
July 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4
5     6     7     8     9    10    11
12    13    14    15    16    17    18
19    20    21    22    23    24    25
26    27    28    29    30    31
August 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1
2     3     4     5     6     7     8
9    10    11    12    13    14    15
16    17    18    19    20    21    22
23    24    25    26    27    28    29
30    31
September 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4     5
6     7     8     9    10    11    12
13    14    15    16    17    18    19
20    21    22    23    24    25    26
27    28    29    30
October 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3
4     5     6     7     8     9    10
11    12    13    14    15    16    17
18    19    20    21    22    23    24
25    26    27    28    29    30    31
November 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4     5     6     7
8     9    10    11    12    13    14
15    16    17    18    19    20    21
22    23    24    25    26    27    28
29    30
December 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat
1     2     3     4     5
6     7     8     9    10    11    12
13    14    15    16    17    18    19
20    21    22    23    24    25    26
27    28    29    30    31

How leap years are calculated

"The Gregorian calendar, the current standard calendar in most of the world, adds a 29th day to February in all years evenly divisible by 4, except for centennial years (those ending in -00) which are not evenly divisible by 400. Thus 1600, 2000 and 2400 area leap years but 1700, 1800, 1900, 2200 and 2300 are not." - Roger C.