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

The "End epoch (UTC)" column shows the Unix timestamp for 00:00 UTC on the Sunday of that week, which is the first second of the last day of the week. The last second of the week is one second before the Monday start of the next week.

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.

Why week numbers pair with epoch time

A Unix timestamp is a single number for an instant. The ISO week number is a label for a seven-day span. Converting between them is common in reporting: a log timestamp becomes "week 36", and a week label becomes the epoch range for that week. Use the timestamps in this table with the epoch converter to move between a week and its Unix time in either direction.

  • Epoch $1924819200 → Monday start of ISO week 1 of $2031.
  • Epoch $1925337600 → Sunday end of ISO week 1 of $2031.
  • Epoch $1955664000 → Monday start of ISO week $52 of $2031.
  • Epoch $1956182400 → Sunday end of ISO week $52 of $2031.

52-week and 53-week years

Under ISO 8601, a year has 53 weeks when the year starts on a Thursday, or when it is a leap year that starts on a Wednesday. Otherwise it has 52 weeks. That is why the number of weeks in a year is not always 52 — it is 52 most years, and 53 about once every five or six years.

  • $2031 is a $52-week year under ISO 8601.
  • Week 1 of $2031 starts on $Dec 30, 2030.
  • Week $52 of $2031 ends on $Dec 28, 2031.

Comparing week numbers across years

Week numbers shift from year to year because each year starts on a different day of the week. A date like March 1 can be in week 9 in one year and week 10 in another. Comparing the week-number tables for consecutive years is the fastest way to see that shift:

Examples

  • January 1, $2031 falls in ISO week $1 of $2030.
  • Today ($Sep $18, $2031) falls in ISO week $— of $2031 — $n/a.
  • ISO week 1 of $2031 runs from $Dec 30, 2030 to $Jan 05, 2031.
  • ISO week $52 of $2031 runs from $Dec 22, 2031 to $Dec 28, 2031.

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Sources & references

More timestamp tools

Need the reverse direction, another precision, or a whole list at once? The epoch time converter on the home page converts dates to Unix timestamps and back — seconds, milliseconds, or microseconds — with batch conversion, and the Unix timestamp to date converter handles one value at a time.

Prefer reading? The guides explain Unix time, timestamp formats, and common bugs in depth, and the methodology page documents exactly how this site handles negative timestamps, fractional seconds, leap seconds, and daylight-saving transitions.

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