CalendarBest
en

1991 Calendar with Week Numbers

1991 has 52 ISO weeks. Week 1 runs from Monday, December 31, 1990 to Sunday, January 6, 1991. Each row below starts on Monday and shows its week number; the table lists every week with its dates.

January 1991
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 1991
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
March 1991
Wk
M
T
W
T
F
S
S
9
1
2
3
10
4
5
6
7
8
9
10
11
11
12
13
14
15
16
17
12
18
19
20
21
22
23
24
13
25
26
27
28
29
30
31
April 1991
Wk
M
T
W
T
F
S
S
14
1
2
3
4
5
6
7
15
8
9
10
11
12
13
14
16
15
16
17
18
19
20
21
17
22
23
24
25
26
27
28
18
29
30
May 1991
Wk
M
T
W
T
F
S
S
18
1
2
3
4
5
19
6
7
8
9
10
11
12
20
13
14
15
16
17
18
19
21
20
21
22
23
24
25
26
22
27
28
29
30
31
June 1991
Wk
M
T
W
T
F
S
S
22
1
2
23
3
4
5
6
7
8
9
24
10
11
12
13
14
15
16
25
17
18
19
20
21
22
23
26
24
25
26
27
28
29
30
July 1991
Wk
M
T
W
T
F
S
S
27
1
2
3
4
5
6
7
28
8
9
10
11
12
13
14
29
15
16
17
18
19
20
21
30
22
23
24
25
26
27
28
31
29
30
31
August 1991
Wk
M
T
W
T
F
S
S
31
1
2
3
4
32
5
6
7
8
9
10
11
33
12
13
14
15
16
17
18
34
19
20
21
22
23
24
25
35
26
27
28
29
30
31
September 1991
Wk
M
T
W
T
F
S
S
35
1
36
2
3
4
5
6
7
8
37
9
10
11
12
13
14
15
38
16
17
18
19
20
21
22
39
23
24
25
26
27
28
29
40
30
October 1991
Wk
M
T
W
T
F
S
S
40
1
2
3
4
5
6
41
7
8
9
10
11
12
13
42
14
15
16
17
18
19
20
43
21
22
23
24
25
26
27
44
28
29
30
31
November 1991
Wk
M
T
W
T
F
S
S
44
1
2
3
45
4
5
6
7
8
9
10
46
11
12
13
14
15
16
17
47
18
19
20
21
22
23
24
48
25
26
27
28
29
30
December 1991
Wk
M
T
W
T
F
S
S
48
1
49
2
3
4
5
6
7
8
50
9
10
11
12
13
14
15
51
16
17
18
19
20
21
22
52
23
24
25
26
27
28
29
1
30
31

All 52 Weeks of 1991

WeekStarts (Mon)Ends (Sun)Federal holidays
1Dec 31, 1990Jan 6, 1991New Year's Day
2Jan 7, 1991Jan 13, 1991—
3Jan 14, 1991Jan 20, 1991—
4Jan 21, 1991Jan 27, 1991MLK Day
5Jan 28, 1991Feb 3, 1991—
6Feb 4, 1991Feb 10, 1991—
7Feb 11, 1991Feb 17, 1991—
8Feb 18, 1991Feb 24, 1991Presidents' Day
9Feb 25, 1991Mar 3, 1991—
10Mar 4, 1991Mar 10, 1991—
11Mar 11, 1991Mar 17, 1991—
12Mar 18, 1991Mar 24, 1991—
13Mar 25, 1991Mar 31, 1991—
14Apr 1, 1991Apr 7, 1991—
15Apr 8, 1991Apr 14, 1991—
16Apr 15, 1991Apr 21, 1991—
17Apr 22, 1991Apr 28, 1991—
18Apr 29, 1991May 5, 1991—
19May 6, 1991May 12, 1991—
20May 13, 1991May 19, 1991—
21May 20, 1991May 26, 1991—
22May 27, 1991Jun 2, 1991Memorial Day
23Jun 3, 1991Jun 9, 1991—
24Jun 10, 1991Jun 16, 1991—
25Jun 17, 1991Jun 23, 1991—
26Jun 24, 1991Jun 30, 1991—
27Jul 1, 1991Jul 7, 1991Independence Day
28Jul 8, 1991Jul 14, 1991—
29Jul 15, 1991Jul 21, 1991—
30Jul 22, 1991Jul 28, 1991—
31Jul 29, 1991Aug 4, 1991—
32Aug 5, 1991Aug 11, 1991—
33Aug 12, 1991Aug 18, 1991—
34Aug 19, 1991Aug 25, 1991—
35Aug 26, 1991Sep 1, 1991—
36Sep 2, 1991Sep 8, 1991Labor Day
37Sep 9, 1991Sep 15, 1991—
38Sep 16, 1991Sep 22, 1991—
39Sep 23, 1991Sep 29, 1991—
40Sep 30, 1991Oct 6, 1991—
41Oct 7, 1991Oct 13, 1991—
42Oct 14, 1991Oct 20, 1991Columbus Day
43Oct 21, 1991Oct 27, 1991—
44Oct 28, 1991Nov 3, 1991—
45Nov 4, 1991Nov 10, 1991—
46Nov 11, 1991Nov 17, 1991Veterans Day
47Nov 18, 1991Nov 24, 1991—
48Nov 25, 1991Dec 1, 1991Thanksgiving
49Dec 2, 1991Dec 8, 1991—
50Dec 9, 1991Dec 15, 1991—
51Dec 16, 1991Dec 22, 1991—
52Dec 23, 1991Dec 29, 1991Christmas Day

1991 Week Numbers FAQ

How many weeks are in 1991?

1991 has 52 ISO weeks. Week 1 runs from Monday, December 31, 1990 to Sunday, January 6, 1991, and week 52 ends on Sunday, December 29, 1991.

What week number is January 1, 1991?

January 1, 1991 is a Tuesday in week 1 of 1991.

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).

Make a 1991 Calendar PDF

Open 1991 in the builder, add your own events, and export a PDF.

Customize the 1991 Calendar