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2031 week numbers · ISO 8601

Week Numbers for 2031 — ISO Week List

Complete list of ISO week numbers for 2031 — 52 weeks, each with its Monday start date, Sunday end date, and the Unix epoch timestamps for the start and end of the week. Weeks run Monday to Sunday per ISO 8601. This is a 52-week year.

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Week numbers for 2031

2031 has 52 ISO weeks. Week 1 starts on Dec 30, 2030 and week 52 ends on Dec 28, 2031. Each week below shows its ISO week number, the Monday start date, the Sunday end date, and the Unix epoch timestamp for the start of the week (00:00 UTC on Monday). Weeks are numbered per ISO 8601, where week 1 is the week containing the first Thursday of the year and every week runs Monday to Sunday.

Week # ISO year Monday start Sunday end Start epoch (UTC) End epoch (UTC)
1 2031 Dec 30, 2030 Jan 05, 2031 1924819200 1925337600
2 2031 Jan 06, 2031 Jan 12, 2031 1925424000 1925942400
3 2031 Jan 13, 2031 Jan 19, 2031 1926028800 1926547200
4 2031 Jan 20, 2031 Jan 26, 2031 1926633600 1927152000
5 2031 Jan 27, 2031 Feb 02, 2031 1927238400 1927756800
6 2031 Feb 03, 2031 Feb 09, 2031 1927843200 1928361600
7 2031 Feb 10, 2031 Feb 16, 2031 1928448000 1928966400
8 2031 Feb 17, 2031 Feb 23, 2031 1929052800 1929571200
9 2031 Feb 24, 2031 Mar 02, 2031 1929657600 1930176000
10 2031 Mar 03, 2031 Mar 09, 2031 1930262400 1930780800
11 2031 Mar 10, 2031 Mar 16, 2031 1930867200 1931385600
12 2031 Mar 17, 2031 Mar 23, 2031 1931472000 1931990400
13 2031 Mar 24, 2031 Mar 30, 2031 1932076800 1932595200
14 2031 Mar 31, 2031 Apr 06, 2031 1932681600 1933200000
15 2031 Apr 07, 2031 Apr 13, 2031 1933286400 1933804800
16 2031 Apr 14, 2031 Apr 20, 2031 1933891200 1934409600
17 2031 Apr 21, 2031 Apr 27, 2031 1934496000 1935014400
18 2031 Apr 28, 2031 May 04, 2031 1935100800 1935619200
19 2031 May 05, 2031 May 11, 2031 1935705600 1936224000
20 2031 May 12, 2031 May 18, 2031 1936310400 1936828800
21 2031 May 19, 2031 May 25, 2031 1936915200 1937433600
22 2031 May 26, 2031 Jun 01, 2031 1937520000 1938038400
23 2031 Jun 02, 2031 Jun 08, 2031 1938124800 1938643200
24 2031 Jun 09, 2031 Jun 15, 2031 1938729600 1939248000
25 2031 Jun 16, 2031 Jun 22, 2031 1939334400 1939852800
26 2031 Jun 23, 2031 Jun 29, 2031 1939939200 1940457600
27 2031 Jun 30, 2031 Jul 06, 2031 1940544000 1941062400
28 2031 Jul 07, 2031 Jul 13, 2031 1941148800 1941667200
29 2031 Jul 14, 2031 Jul 20, 2031 1941753600 1942272000
30 2031 Jul 21, 2031 Jul 27, 2031 1942358400 1942876800
31 2031 Jul 28, 2031 Aug 03, 2031 1942963200 1943481600
32 2031 Aug 04, 2031 Aug 10, 2031 1943568000 1944086400
33 2031 Aug 11, 2031 Aug 17, 2031 1944172800 1944691200
34 2031 Aug 18, 2031 Aug 24, 2031 1944777600 1945296000
35 2031 Aug 25, 2031 Aug 31, 2031 1945382400 1945900800
36 2031 Sep 01, 2031 Sep 07, 2031 1945987200 1946505600
37 2031 Sep 08, 2031 Sep 14, 2031 1946592000 1947110400
38 2031 Sep 15, 2031 Sep 21, 2031 1947196800 1947715200
39 2031 Sep 22, 2031 Sep 28, 2031 1947801600 1948320000
40 2031 Sep 29, 2031 Oct 05, 2031 1948406400 1948924800
41 2031 Oct 06, 2031 Oct 12, 2031 1949011200 1949529600
42 2031 Oct 13, 2031 Oct 19, 2031 1949616000 1950134400
43 2031 Oct 20, 2031 Oct 26, 2031 1950220800 1950739200
44 2031 Oct 27, 2031 Nov 02, 2031 1950825600 1951344000
45 2031 Nov 03, 2031 Nov 09, 2031 1951430400 1951948800
46 2031 Nov 10, 2031 Nov 16, 2031 1952035200 1952553600
47 2031 Nov 17, 2031 Nov 23, 2031 1952640000 1953158400
48 2031 Nov 24, 2031 Nov 30, 2031 1953244800 1953763200
49 2031 Dec 01, 2031 Dec 07, 2031 1953849600 1954368000
50 2031 Dec 08, 2031 Dec 14, 2031 1954454400 1954972800
51 2031 Dec 15, 2031 Dec 21, 2031 1955059200 1955577600
52 2031 Dec 22, 2031 Dec 28, 2031 1955664000 1956182400

Epoch columns are UTC: "Start" is 00:00:00 on the Monday, "End" is 00:00:00 on the Sunday — the first second of the last day, not the last second of the week. For week 1 of 2031, that end value is 1925337600; add 604,799 to any start epoch to land on the week's final second (Sunday 23:59:59).

How to read this table

  • Week # — the ISO 8601 week number for that week.
  • ISO year — the ISO week-numbering year this week belongs to (can differ from the calendar year for a few edge days).
  • Monday start — the date of the Monday that starts the week, in UTC.
  • Sunday end — the date of the Sunday that ends the week, in UTC.
  • Start epoch (UTC) — Unix timestamp for 00:00 UTC on Monday.
  • End epoch (UTC) — Unix timestamp for 00:00 UTC on Sunday.

Reading 2031's weeks as epoch ranges

A Unix timestamp pins an instant; an ISO week names a seven-day span. Reporting tools constantly translate between the two — a log line becomes "week 9", or a weekly report becomes an epoch range to query. In 2031, that mapping is concrete: week 1 opens at epoch 1924819200, and week 52 closes at 1956787199, the final second of Sunday, Dec 28, 2031.

  • Epoch 1924819200 → 00:00 UTC on Monday of week 1 (Dec 30, 2030).
  • Epoch 1956787199 → 23:59:59 UTC on Sunday of week 52 — one second before 1956787200 would tick over to the next ISO year's week 1.
  • Any week's span → its start epoch up to start + 604,799 seconds; exactly 604,800 seconds per week, no exceptions (UTC has no DST).

Why 2031 has 52 weeks

The count falls out of one rule: ISO week 1 is the week containing the first Thursday, and weeks run Monday–Sunday. 2031 starts on a Wednesday, which keeps it a 52-week year; the days after week 52 belong to week 1 of 2032. December 31, $2031 closes on a $Wednesday, and the last week ends $on Dec 28, 2031, still inside 2031

How 2031's weeks line up against neighboring years

The same calendar date rarely keeps its week number from one year to the next, because each January 1 lands on a different weekday. March 1, 2031 sits in ISO week 9; in 2030 and 2032 it will sit one week off in either direction. The tables for the adjacent years make the drift visible:

Examples: 2031's weeks at the epoch boundaries

  • January 1, 2031 (Wednesday) falls in ISO week 1 of ISO year 2031.
  • December 31, 2031 (Wednesday) falls in ISO week 1 of ISO year 2032.
  • March 1, 2031 sits in ISO week 9 — the sort of date whose week number shifts year to year.

Week Numbers for 2031 — ISO Week List — questions from actual use

What are the week numbers for 2031?

2031 has 52 ISO weeks. Week 1 runs Dec 30, 2030 to Jan 05, 2031 — it starts in December 2030, because ISO week 1 is the week containing the first Thursday, and 2031's first Thursday pulls the week start back into 2030, and week 52 runs Dec 22, 2031 to Dec 28, 2031.

Is 2031 a 52-week or 53-week year?

2031 is a 52-week year (January 1 was a Wednesday). The next 53-week year is 2032, because its January 1 falls on the right weekday to spill into a 53rd week.

When do 2031's week numbers and dates disagree?

Day-of-year and week-of-year counting disagree at the edges. January 1, 2031 (Wednesday) sits in ISO week 1 of 2031, and December 31 (Wednesday) lands in week 1 of 2032 — already week 1 of 2032. The ISO year owns the days its weeks' Thursdays fall in, so a few days each December and January always belong to the neighboring year.

What epoch timestamps belong to a week in 2031?

Each week on this page shows two Unix timestamps: 00:00 UTC on its Monday (the start) and 00:00 UTC on its Sunday. For 2031, those run from 1924819200 for the start of week 1 to 1956787199 for the last second of week 52 — a span of exactly 31,449,600 seconds across 52 weeks.

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Sources & references

Around the 2031 week calendar

Neighbor years, the same days as day numbers, and the background behind the epoch values:

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