All 53 Weeks of 1931
| Week | Starts (Mon) | Ends (Sun) | Federal holidays |
|---|---|---|---|
| 1 | Dec 29, 1930 | Jan 4, 1931 | New Year's Day |
| 2 | Jan 5, 1931 | Jan 11, 1931 | — |
| 3 | Jan 12, 1931 | Jan 18, 1931 | — |
| 4 | Jan 19, 1931 | Jan 25, 1931 | MLK Day |
| 5 | Jan 26, 1931 | Feb 1, 1931 | — |
| 6 | Feb 2, 1931 | Feb 8, 1931 | — |
| 7 | Feb 9, 1931 | Feb 15, 1931 | — |
| 8 | Feb 16, 1931 | Feb 22, 1931 | Presidents' Day |
| 9 | Feb 23, 1931 | Mar 1, 1931 | — |
| 10 | Mar 2, 1931 | Mar 8, 1931 | — |
| 11 | Mar 9, 1931 | Mar 15, 1931 | — |
| 12 | Mar 16, 1931 | Mar 22, 1931 | — |
| 13 | Mar 23, 1931 | Mar 29, 1931 | — |
| 14 | Mar 30, 1931 | Apr 5, 1931 | — |
| 15 | Apr 6, 1931 | Apr 12, 1931 | — |
| 16 | Apr 13, 1931 | Apr 19, 1931 | — |
| 17 | Apr 20, 1931 | Apr 26, 1931 | — |
| 18 | Apr 27, 1931 | May 3, 1931 | — |
| 19 | May 4, 1931 | May 10, 1931 | — |
| 20 | May 11, 1931 | May 17, 1931 | — |
| 21 | May 18, 1931 | May 24, 1931 | — |
| 22 | May 25, 1931 | May 31, 1931 | Memorial Day |
| 23 | Jun 1, 1931 | Jun 7, 1931 | — |
| 24 | Jun 8, 1931 | Jun 14, 1931 | — |
| 25 | Jun 15, 1931 | Jun 21, 1931 | — |
| 26 | Jun 22, 1931 | Jun 28, 1931 | — |
| 27 | Jun 29, 1931 | Jul 5, 1931 | Independence Day |
| 28 | Jul 6, 1931 | Jul 12, 1931 | — |
| 29 | Jul 13, 1931 | Jul 19, 1931 | — |
| 30 | Jul 20, 1931 | Jul 26, 1931 | — |
| 31 | Jul 27, 1931 | Aug 2, 1931 | — |
| 32 | Aug 3, 1931 | Aug 9, 1931 | — |
| 33 | Aug 10, 1931 | Aug 16, 1931 | — |
| 34 | Aug 17, 1931 | Aug 23, 1931 | — |
| 35 | Aug 24, 1931 | Aug 30, 1931 | — |
| 36 | Aug 31, 1931 | Sep 6, 1931 | — |
| 37 | Sep 7, 1931 | Sep 13, 1931 | Labor Day |
| 38 | Sep 14, 1931 | Sep 20, 1931 | — |
| 39 | Sep 21, 1931 | Sep 27, 1931 | — |
| 40 | Sep 28, 1931 | Oct 4, 1931 | — |
| 41 | Oct 5, 1931 | Oct 11, 1931 | — |
| 42 | Oct 12, 1931 | Oct 18, 1931 | Columbus Day |
| 43 | Oct 19, 1931 | Oct 25, 1931 | — |
| 44 | Oct 26, 1931 | Nov 1, 1931 | — |
| 45 | Nov 2, 1931 | Nov 8, 1931 | — |
| 46 | Nov 9, 1931 | Nov 15, 1931 | Veterans Day |
| 47 | Nov 16, 1931 | Nov 22, 1931 | — |
| 48 | Nov 23, 1931 | Nov 29, 1931 | Thanksgiving |
| 49 | Nov 30, 1931 | Dec 6, 1931 | — |
| 50 | Dec 7, 1931 | Dec 13, 1931 | — |
| 51 | Dec 14, 1931 | Dec 20, 1931 | — |
| 52 | Dec 21, 1931 | Dec 27, 1931 | Christmas Day |
| 53 | Dec 28, 1931 | Jan 3, 1932 | New Year's Day |
1931 Week Numbers FAQ
How many weeks are in 1931?
1931 has 53 ISO weeks. Week 1 runs from Monday, December 29, 1930 to Sunday, January 4, 1931, and week 53 ends on Sunday, January 3, 1932. 1931 has a 53rd week because it starts on a Thursday.
What week number is January 1, 1931?
January 1, 1931 is a Thursday in week 1 of 1931.
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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