Common year starting on Friday

This is the calendar for any common year starting on Friday, January 1 (dominical letter C). Examples: Gregorian years 1982, 1993, 1999, 2010, 2021, 2027, and 2038[1] or Julian year 1910 (see bottom tables).

A common year is a year with 365 days, i.e., not a leap year.

January
Su Mo Tu We Th Fr Sa
0102
03040506070809
10111213141516
17181920212223
24252627282930
31  
February
Su Mo Tu We Th Fr Sa
010203040506
07080910111213
14151617181920
21222324252627
28  
 
March
Su Mo Tu We Th Fr Sa
010203040506
07080910111213
14151617181920
21222324252627
28293031  
 
April
Su Mo Tu We Th Fr Sa
010203
04050607080910
11121314151617
18192021222324
252627282930
 
May
Su Mo Tu We Th Fr Sa
01
02030405060708
09101112131415
16171819202122
23242526272829
3031  
June
Su Mo Tu We Th Fr Sa
0102030405
06070809101112
13141516171819
20212223242526
27282930  
 
July
Su Mo Tu We Th Fr Sa
010203
04050607080910
11121314151617
18192021222324
25262728293031
 
August
Su Mo Tu We Th Fr Sa
01020304050607
08091011121314
15161718192021
22232425262728
293031  
 
September
Su Mo Tu We Th Fr Sa
01020304
05060708091011
12131415161718
19202122232425
2627282930  
 
October
Su Mo Tu We Th Fr Sa
0102
03040506070809
10111213141516
17181920212223
24252627282930
31  
November
Su Mo Tu We Th Fr Sa
010203040506
07080910111213
14151617181920
21222324252627
282930  
 
December
Su Mo Tu We Th Fr Sa
01020304
05060708091011
12131415161718
19202122232425
262728293031  
 
Millennium Century Gregorian Year[1]
2nd millennium: 19th century: 1802 1813 1819 1830 1841 1847 1858 1869 1875 1886 1897
2nd millennium: 20th century: 1909 1915 1926 1937 1943 1954 1965 1971 1982 1993 1999
3rd millennium: 21st century: 2010 2021 2027 2038 2049 2055 2066 2077 2083 2094 2100
3rd millennium: 22nd century: 2106 2117 2123 2134 2145 2151 2162 2173 2179 2190
Millennium Century Julian Year[2]
2nd Millennium: 19th century: 1809 1815 1826 1837 1843 1854 1865 1871 1882 1893 1899
2nd Millennium: 20th century: 1910 1921 1927 1938 1949 1955 1966 1977 1983 1994
3rd Millennium: 21st century: 2005 2011 2022 2033 2039 2050 2061 2067 2078 2089 2095
3rd Millennium: 22nd century: 2106 2117 2123 2134 2145 2151 2162 2173 2179 2190

This is the only year type where the nth "Doomsday" (this year Sunday) is not in ISO week n; it is in ISO week n-1.

References

  1. 1 2 "A common year beginning on Friday", jonstlouis.htmlplanet.com, 2011, webpage: HTMcal.
  2. ↑ "Calendar in year 1809 (Russia)" (Julian calendar, starting Tuesday), webpage: Julian-1809 (Romania used Julian in 1919, when Russia adopted Gregorian).
Gregorian year types per leap cycle by Dominical letter (DL)[1] and Doomsday (DD)
Year starts Common years Leap years
1 Jan Count Ratio 31 Dec DL DD Count Ratio 31 Dec DL DD Count Ratio
Sun 58 14.50 % Sun A Tue 43 10.75 % Mon AG Wed 15 03.75 %
Sat 56 14.00 % Sat B Mon 43 10.75 % Sun BA Tue 13 03.25 %
Fri 58 14.50 % Fri C Sun 43 10.75 % Sat CB Mon 15 03.75 %
Thu 57 14.25 % Thu D Sat 44 11.00 % Fri DC Sun 13 03.25 %
Wed 57 14.25 % Wed E Fri 43 10.75 % Thu ED Sat 14 03.50 %
Tue 58 14.50 % Tue F Thu 44 11.00 % Wed FE Fri 14 03.50 %
Mon 56 14.00 % Mon G Wed 43 10.75 % Tue GF Thu 13 03.25 %
∑ 400 100.0 % 303 75.75 % 97 24.25 %
  1. ↑ Robert H. van Gent (2005). "Mathematics of the ISO calendar". Department of Mathematics at Utrecht University.
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