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1980 Calendar with Week Numbers

1980 has 52 ISO weeks. Week 1 runs from Monday, December 31, 1979 to Sunday, January 6, 1980. Each row below starts on Monday and shows its week number; the table lists every week with its dates.

January 1980
Wk
M
T
W
T
F
S
S
1
1
2
3
4
5
6
2
7
8
9
10
11
12
13
3
14
15
16
17
18
19
20
4
21
22
23
24
25
26
27
5
28
29
30
31
February 1980
Wk
M
T
W
T
F
S
S
5
1
2
3
6
4
5
6
7
8
9
10
7
11
12
13
14
15
16
17
8
18
19
20
21
22
23
24
9
25
26
27
28
29
March 1980
Wk
M
T
W
T
F
S
S
9
1
2
10
3
4
5
6
7
8
9
11
10
11
12
13
14
15
16
12
17
18
19
20
21
22
23
13
24
25
26
27
28
29
30
14
31
April 1980
Wk
M
T
W
T
F
S
S
14
1
2
3
4
5
6
15
7
8
9
10
11
12
13
16
14
15
16
17
18
19
20
17
21
22
23
24
25
26
27
18
28
29
30
May 1980
Wk
M
T
W
T
F
S
S
18
1
2
3
4
19
5
6
7
8
9
10
11
20
12
13
14
15
16
17
18
21
19
20
21
22
23
24
25
22
26
27
28
29
30
31
June 1980
Wk
M
T
W
T
F
S
S
22
1
23
2
3
4
5
6
7
8
24
9
10
11
12
13
14
15
25
16
17
18
19
20
21
22
26
23
24
25
26
27
28
29
27
30
July 1980
Wk
M
T
W
T
F
S
S
27
1
2
3
4
5
6
28
7
8
9
10
11
12
13
29
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
31
28
29
30
31
August 1980
Wk
M
T
W
T
F
S
S
31
1
2
3
32
4
5
6
7
8
9
10
33
11
12
13
14
15
16
17
34
18
19
20
21
22
23
24
35
25
26
27
28
29
30
31
September 1980
Wk
M
T
W
T
F
S
S
36
1
2
3
4
5
6
7
37
8
9
10
11
12
13
14
38
15
16
17
18
19
20
21
39
22
23
24
25
26
27
28
40
29
30
October 1980
Wk
M
T
W
T
F
S
S
40
1
2
3
4
5
41
6
7
8
9
10
11
12
42
13
14
15
16
17
18
19
43
20
21
22
23
24
25
26
44
27
28
29
30
31
November 1980
Wk
M
T
W
T
F
S
S
44
1
2
45
3
4
5
6
7
8
9
46
10
11
12
13
14
15
16
47
17
18
19
20
21
22
23
48
24
25
26
27
28
29
30
December 1980
Wk
M
T
W
T
F
S
S
49
1
2
3
4
5
6
7
50
8
9
10
11
12
13
14
51
15
16
17
18
19
20
21
52
22
23
24
25
26
27
28
1
29
30
31

All 52 Weeks of 1980

WeekStarts (Mon)Ends (Sun)Federal holidays
1Dec 31, 1979Jan 6, 1980New Year's Day
2Jan 7, 1980Jan 13, 1980—
3Jan 14, 1980Jan 20, 1980—
4Jan 21, 1980Jan 27, 1980MLK Day
5Jan 28, 1980Feb 3, 1980—
6Feb 4, 1980Feb 10, 1980—
7Feb 11, 1980Feb 17, 1980—
8Feb 18, 1980Feb 24, 1980Presidents' Day
9Feb 25, 1980Mar 2, 1980—
10Mar 3, 1980Mar 9, 1980—
11Mar 10, 1980Mar 16, 1980—
12Mar 17, 1980Mar 23, 1980—
13Mar 24, 1980Mar 30, 1980—
14Mar 31, 1980Apr 6, 1980—
15Apr 7, 1980Apr 13, 1980—
16Apr 14, 1980Apr 20, 1980—
17Apr 21, 1980Apr 27, 1980—
18Apr 28, 1980May 4, 1980—
19May 5, 1980May 11, 1980—
20May 12, 1980May 18, 1980—
21May 19, 1980May 25, 1980—
22May 26, 1980Jun 1, 1980Memorial Day
23Jun 2, 1980Jun 8, 1980—
24Jun 9, 1980Jun 15, 1980—
25Jun 16, 1980Jun 22, 1980—
26Jun 23, 1980Jun 29, 1980—
27Jun 30, 1980Jul 6, 1980Independence Day
28Jul 7, 1980Jul 13, 1980—
29Jul 14, 1980Jul 20, 1980—
30Jul 21, 1980Jul 27, 1980—
31Jul 28, 1980Aug 3, 1980—
32Aug 4, 1980Aug 10, 1980—
33Aug 11, 1980Aug 17, 1980—
34Aug 18, 1980Aug 24, 1980—
35Aug 25, 1980Aug 31, 1980—
36Sep 1, 1980Sep 7, 1980Labor Day
37Sep 8, 1980Sep 14, 1980—
38Sep 15, 1980Sep 21, 1980—
39Sep 22, 1980Sep 28, 1980—
40Sep 29, 1980Oct 5, 1980—
41Oct 6, 1980Oct 12, 1980—
42Oct 13, 1980Oct 19, 1980Columbus Day
43Oct 20, 1980Oct 26, 1980—
44Oct 27, 1980Nov 2, 1980—
45Nov 3, 1980Nov 9, 1980—
46Nov 10, 1980Nov 16, 1980Veterans Day
47Nov 17, 1980Nov 23, 1980—
48Nov 24, 1980Nov 30, 1980Thanksgiving
49Dec 1, 1980Dec 7, 1980—
50Dec 8, 1980Dec 14, 1980—
51Dec 15, 1980Dec 21, 1980—
52Dec 22, 1980Dec 28, 1980Christmas Day

1980 Week Numbers FAQ

How many weeks are in 1980?

1980 has 52 ISO weeks. Week 1 runs from Monday, December 31, 1979 to Sunday, January 6, 1980, and week 52 ends on Sunday, December 28, 1980.

What week number is January 1, 1980?

January 1, 1980 is a Tuesday in week 1 of 1980.

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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