THIRTEEN-PERIOD CALENDAR FOR 1937 
For a number of years the practice of dividing the year into 13 periods of 4 weeks' each has 
been gaining favor in business. Divided this way, any period is directly comparable to any 
other period. 
The varying number of calendar days, working days, Saturdays, etc., in different months of 
the ordinary 12 month calendar often distorts seriously such vital statistics of business as sales, 
costs, production, payrolls, etc For National Diary users who record such facts on a weekly 
or four weekly basis, the 1937 Official 13 period calendar is presented by courtesy of the 
International Fixed Calendar League, Rochester, N. V. 
1st Period 7thi Period 
Dec. 
s 
M 
T 
w 
T 
F 
s 
s 
M 
T 
w 
T 
F 
s 
27 
28 
29 
30 
31 
1 
2 
June 
13 
14 
15 
16 
17 
18 
19 
Jan. 
3 
4 
5 
6 
7 
8 
9 
20 
21 
22 
23 
24 
25 
26 
10 
11 
12 
13 
14 
15 
16 
27 
28 
29 
30 
1 
2 
3 
17 
18 
19 
20 
2T 
22 
23 
July 
4 
5 
6 
7 
8 
9 
10 
2nd 
Period 
8 th 
Period 
s 
M 
T 
w 
T 
F 
s 
s 
M 
T 
w 
T 
F 
s 
Jan. 
24 
25 
26 
27 
28 
29 
30 
July 
11 
12 
13 
14 
15 
16 
17 
Feb. 
31 
1 
2 
3 
4 
5 
6 
18 
19 
20 
21 
22 
23 
24 
7 
8 
9 
10 
11 
12 
13 
25 
26 
27 
28 
29 
30 
31 
14 
15 
16 
17 
18 
19 
20 
Aug. 
1 
2 
3 
4 
5 
6 
7 
V 
3rd 
Period 
9th 
Period 
s 
M 
T 
w 
T 
F 
s 
s 
M 
T 
w 
T 
F 
s 
Feb. 
21 
22 
23 
24 
25 
26 
27 
Aug. 
8 
9 
10 
11 
12 
13 
14 
Mar. 
28 
1 
2 
3 
4 
5 
6 
15 
16 
17 
18 
19 
20 
21 
7 
8 
9 
10 
11 
12 
13 
22 
23 
24 
25 
26 
27 
28 
14 
15 
16 
17 
18 
19 
20 
29 
30 
31 
1 
2 
3 
4 
4thi 
1 
Period 
10th 
Period 
s 
M 
T 
w 
T 
F 
s 
Sept. 
s 
M 
T 
w 
T 
F 
s 
Mar. 
21 
22 
23 
24 
25 
26 
27 
5 
6 
7 
8 
9 
10 
11 
28 
29 
30 
31 
1 
2 
3 
12 
13 
14 
15 
16 
17 
18 
April 
4 
5 
6 
7 
8 
9 
10 
19 
20 
21 
22 
23 
24 
25 
11 
12 
13 
14 
15 
16 
17 
26 
27 
28 
29 
30 
1 
2 
5tH 
Period 
11th 
Period 
s 
M 
T 
w 
T 
F 
s 
s 
M 
T 
w 
T 
F 
s 
April 
18 
19 
20 
21 
22 
23 
24 
Oct. 
3 
4 
5 
6 
7 
8 
9 
May 
25 
26 
27 
28 
29 
30 
1 
10 
11 
12 
13 
14 
15 
16 
2 
3 
4 
5 
6 
7 
8 
17 
18 
19 
20 
21 
22 
23 
9 
10 
11 
12 
13 
14 
15 
24 
25 
26 
27 
28 
29 
30 
6th 
Period 
12th 
Period 
May 
s 
M 
T 
w 
T 
F 
s 
s 
M 
T 
w 
T 
F 
s 
16 
17 
18 
19 
20 
21 
22 
Nov. 
31 
1 
2 
3 
4 
■ 5 
6 
23 
24 
25 
26 
27 
28 
29 
7 
8 
9 
10 
11 
12 
13 
June 
30 
31 
1 
2 
3 
4 
5 
14 
15 
16 
17 
18 
19 
20 
6 
7 
8 
9 
10 
11 
12 
21 
22 
23 
24 
25 
26 
27 
Period 
S M T w T F s~ 
Nov. 28 29 30 1 2 3 4 
Dec. 5 6 7 8 9 10 11 
12 13 14 15 16 17 18 
19 20 21 22 23 24 25 
Friday, January 1, 1937 
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