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1981 Calendar with Week Numbers

1981 has 53 ISO weeks. Week 1 runs from Monday, December 29, 1980 to Sunday, January 4, 1981. Each row below starts on Monday and shows its week number; the table lists every week with its dates.

January 1981
Wk
M
T
W
T
F
S
S
1
1
2
3
4
2
5
6
7
8
9
10
11
3
12
13
14
15
16
17
18
4
19
20
21
22
23
24
25
5
26
27
28
29
30
31
February 1981
Wk
M
T
W
T
F
S
S
5
1
6
2
3
4
5
6
7
8
7
9
10
11
12
13
14
15
8
16
17
18
19
20
21
22
9
23
24
25
26
27
28
March 1981
Wk
M
T
W
T
F
S
S
9
1
10
2
3
4
5
6
7
8
11
9
10
11
12
13
14
15
12
16
17
18
19
20
21
22
13
23
24
25
26
27
28
29
14
30
31
April 1981
Wk
M
T
W
T
F
S
S
14
1
2
3
4
5
15
6
7
8
9
10
11
12
16
13
14
15
16
17
18
19
17
20
21
22
23
24
25
26
18
27
28
29
30
May 1981
Wk
M
T
W
T
F
S
S
18
1
2
3
19
4
5
6
7
8
9
10
20
11
12
13
14
15
16
17
21
18
19
20
21
22
23
24
22
25
26
27
28
29
30
31
June 1981
Wk
M
T
W
T
F
S
S
23
1
2
3
4
5
6
7
24
8
9
10
11
12
13
14
25
15
16
17
18
19
20
21
26
22
23
24
25
26
27
28
27
29
30
July 1981
Wk
M
T
W
T
F
S
S
27
1
2
3
4
5
28
6
7
8
9
10
11
12
29
13
14
15
16
17
18
19
30
20
21
22
23
24
25
26
31
27
28
29
30
31
August 1981
Wk
M
T
W
T
F
S
S
31
1
2
32
3
4
5
6
7
8
9
33
10
11
12
13
14
15
16
34
17
18
19
20
21
22
23
35
24
25
26
27
28
29
30
36
31
September 1981
Wk
M
T
W
T
F
S
S
36
1
2
3
4
5
6
37
7
8
9
10
11
12
13
38
14
15
16
17
18
19
20
39
21
22
23
24
25
26
27
40
28
29
30
October 1981
Wk
M
T
W
T
F
S
S
40
1
2
3
4
41
5
6
7
8
9
10
11
42
12
13
14
15
16
17
18
43
19
20
21
22
23
24
25
44
26
27
28
29
30
31
November 1981
Wk
M
T
W
T
F
S
S
44
1
45
2
3
4
5
6
7
8
46
9
10
11
12
13
14
15
47
16
17
18
19
20
21
22
48
23
24
25
26
27
28
29
49
30
December 1981
Wk
M
T
W
T
F
S
S
49
1
2
3
4
5
6
50
7
8
9
10
11
12
13
51
14
15
16
17
18
19
20
52
21
22
23
24
25
26
27
53
28
29
30
31

All 53 Weeks of 1981

WeekStarts (Mon)Ends (Sun)Federal holidays
1Dec 29, 1980Jan 4, 1981New Year's Day
2Jan 5, 1981Jan 11, 1981—
3Jan 12, 1981Jan 18, 1981—
4Jan 19, 1981Jan 25, 1981MLK Day
5Jan 26, 1981Feb 1, 1981—
6Feb 2, 1981Feb 8, 1981—
7Feb 9, 1981Feb 15, 1981—
8Feb 16, 1981Feb 22, 1981Presidents' Day
9Feb 23, 1981Mar 1, 1981—
10Mar 2, 1981Mar 8, 1981—
11Mar 9, 1981Mar 15, 1981—
12Mar 16, 1981Mar 22, 1981—
13Mar 23, 1981Mar 29, 1981—
14Mar 30, 1981Apr 5, 1981—
15Apr 6, 1981Apr 12, 1981—
16Apr 13, 1981Apr 19, 1981—
17Apr 20, 1981Apr 26, 1981—
18Apr 27, 1981May 3, 1981—
19May 4, 1981May 10, 1981—
20May 11, 1981May 17, 1981—
21May 18, 1981May 24, 1981—
22May 25, 1981May 31, 1981Memorial Day
23Jun 1, 1981Jun 7, 1981—
24Jun 8, 1981Jun 14, 1981—
25Jun 15, 1981Jun 21, 1981—
26Jun 22, 1981Jun 28, 1981—
27Jun 29, 1981Jul 5, 1981Independence Day
28Jul 6, 1981Jul 12, 1981—
29Jul 13, 1981Jul 19, 1981—
30Jul 20, 1981Jul 26, 1981—
31Jul 27, 1981Aug 2, 1981—
32Aug 3, 1981Aug 9, 1981—
33Aug 10, 1981Aug 16, 1981—
34Aug 17, 1981Aug 23, 1981—
35Aug 24, 1981Aug 30, 1981—
36Aug 31, 1981Sep 6, 1981—
37Sep 7, 1981Sep 13, 1981Labor Day
38Sep 14, 1981Sep 20, 1981—
39Sep 21, 1981Sep 27, 1981—
40Sep 28, 1981Oct 4, 1981—
41Oct 5, 1981Oct 11, 1981—
42Oct 12, 1981Oct 18, 1981Columbus Day
43Oct 19, 1981Oct 25, 1981—
44Oct 26, 1981Nov 1, 1981—
45Nov 2, 1981Nov 8, 1981—
46Nov 9, 1981Nov 15, 1981Veterans Day
47Nov 16, 1981Nov 22, 1981—
48Nov 23, 1981Nov 29, 1981Thanksgiving
49Nov 30, 1981Dec 6, 1981—
50Dec 7, 1981Dec 13, 1981—
51Dec 14, 1981Dec 20, 1981—
52Dec 21, 1981Dec 27, 1981Christmas Day
53Dec 28, 1981Jan 3, 1982New Year's Day

1981 Week Numbers FAQ

How many weeks are in 1981?

1981 has 53 ISO weeks. Week 1 runs from Monday, December 29, 1980 to Sunday, January 4, 1981, and week 53 ends on Sunday, January 3, 1982. 1981 has a 53rd week because it starts on a Thursday.

What week number is January 1, 1981?

January 1, 1981 is a Thursday in week 1 of 1981.

How are ISO week numbers counted?

ISO 8601 weeks start on Monday. Week 1 is the week that contains the first Thursday of the year, which is the same as the week that contains January 4. A year has 52 weeks, or 53 when it starts on a Thursday (or on a Wednesday in a leap year).

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