Week numbers 2028

2028 has 52 ISO weeks: week 1 starts on Monday, January 3, 2028, and the last week ends on Sunday, December 31, 2028. The table lists every week with its dates.

Source: IEEE Std 1003.1 (POSIX) – strftime(), %V: ISO 8601 week number. Updated: 28 September 2026.

Week 40

28 September 2026 to 4 October 2026

Week number of a date

WeekYear

Year

Week numbers 2028 (52 weeks, ISO 8601)
Week	Monday	Sunday	US week
1	Mon, 3 Jan 2028	Sun, 9 Jan 2028	2
2	Mon, 10 Jan 2028	Sun, 16 Jan 2028	3
3	Mon, 17 Jan 2028	Sun, 23 Jan 2028	4
4	Mon, 24 Jan 2028	Sun, 30 Jan 2028	5
5	Mon, 31 Jan 2028	Sun, 6 Feb 2028	6
6	Mon, 7 Feb 2028	Sun, 13 Feb 2028	7
7	Mon, 14 Feb 2028	Sun, 20 Feb 2028	8
8	Mon, 21 Feb 2028	Sun, 27 Feb 2028	9
9	Mon, 28 Feb 2028	Sun, 5 Mar 2028	10
10	Mon, 6 Mar 2028	Sun, 12 Mar 2028	11
11	Mon, 13 Mar 2028	Sun, 19 Mar 2028	12
12	Mon, 20 Mar 2028	Sun, 26 Mar 2028	13
13	Mon, 27 Mar 2028	Sun, 2 Apr 2028	14
14	Mon, 3 Apr 2028	Sun, 9 Apr 2028	15
15	Mon, 10 Apr 2028	Sun, 16 Apr 2028	16
16	Mon, 17 Apr 2028	Sun, 23 Apr 2028	17
17	Mon, 24 Apr 2028	Sun, 30 Apr 2028	18
18	Mon, 1 May 2028	Sun, 7 May 2028	19
19	Mon, 8 May 2028	Sun, 14 May 2028	20
20	Mon, 15 May 2028	Sun, 21 May 2028	21
21	Mon, 22 May 2028	Sun, 28 May 2028	22
22	Mon, 29 May 2028	Sun, 4 Jun 2028	23
23	Mon, 5 Jun 2028	Sun, 11 Jun 2028	24
24	Mon, 12 Jun 2028	Sun, 18 Jun 2028	25
25	Mon, 19 Jun 2028	Sun, 25 Jun 2028	26
26	Mon, 26 Jun 2028	Sun, 2 Jul 2028	27
27	Mon, 3 Jul 2028	Sun, 9 Jul 2028	28
28	Mon, 10 Jul 2028	Sun, 16 Jul 2028	29
29	Mon, 17 Jul 2028	Sun, 23 Jul 2028	30
30	Mon, 24 Jul 2028	Sun, 30 Jul 2028	31
31	Mon, 31 Jul 2028	Sun, 6 Aug 2028	32
32	Mon, 7 Aug 2028	Sun, 13 Aug 2028	33
33	Mon, 14 Aug 2028	Sun, 20 Aug 2028	34
34	Mon, 21 Aug 2028	Sun, 27 Aug 2028	35
35	Mon, 28 Aug 2028	Sun, 3 Sept 2028	36
36	Mon, 4 Sept 2028	Sun, 10 Sept 2028	37
37	Mon, 11 Sept 2028	Sun, 17 Sept 2028	38
38	Mon, 18 Sept 2028	Sun, 24 Sept 2028	39
39	Mon, 25 Sept 2028	Sun, 1 Oct 2028	40
40	Mon, 2 Oct 2028	Sun, 8 Oct 2028	41
41	Mon, 9 Oct 2028	Sun, 15 Oct 2028	42
42	Mon, 16 Oct 2028	Sun, 22 Oct 2028	43
43	Mon, 23 Oct 2028	Sun, 29 Oct 2028	44
44	Mon, 30 Oct 2028	Sun, 5 Nov 2028	45
45	Mon, 6 Nov 2028	Sun, 12 Nov 2028	46
46	Mon, 13 Nov 2028	Sun, 19 Nov 2028	47
47	Mon, 20 Nov 2028	Sun, 26 Nov 2028	48
48	Mon, 27 Nov 2028	Sun, 3 Dec 2028	49
49	Mon, 4 Dec 2028	Sun, 10 Dec 2028	50
50	Mon, 11 Dec 2028	Sun, 17 Dec 2028	51
51	Mon, 18 Dec 2028	Sun, 24 Dec 2028	52
52	Mon, 25 Dec 2028	Sun, 31 Dec 2028	53

Result

How it is calculated

2028 at a glance

January 1, 2028 is a Saturday and still belongs to week 52 of 2027.
Week 1 runs from Monday, January 3, 2028 to Sunday, January 9, 2028.
2028 has 52 ISO weeks. The last week ends on Sunday, December 31, 2028.
Christmas Eve (December 24) is in week 51; New Year’s Eve is in week 52.
With the US count (Sunday to Saturday, week 1 contains January 1), 2028 has 54 partial weeks.

Using the overview

The table above lists all weeks of 2028 with Monday and Sunday; the current week is highlighted. “Print” prints only the table. “Week numbers as calendar file” creates an ICS file with one all-day entry per week (“Week 1”, “Week 2” …) for Outlook, Google or Apple Calendar. The converter above finds the week of any date.

Counting method

ISO 8601: weeks start on Monday, week 1 contains the first Thursday. Today’s week and more background: week number today. Other years: week numbers 2026, week numbers 2027.

Frequently asked questions

How many weeks are in 2028?

52 ISO weeks. Week 1 starts on Monday, January 3, 2028, week 52 ends on Sunday, December 31, 2028. The US count gives 54 partial weeks.

What week is January 1, 2028?

Week 52 of 2027, because January 1, 2028 is a Saturday – ISO week 1 only starts on Monday, January 3, 2028. In the US count it is week 1.

What week number is Christmas 2028?

December 24, 2028 is in ISO week 51; December 31 is in week 52.

Can I import the 2028 week numbers into Outlook or Google Calendar?

Yes. “Week numbers as calendar file (ICS)” downloads a file with one all-day event per week. Import it in Outlook via File › Open & Export › Import, or in Google Calendar via Settings › Import.

Sources and legal basis

As of: 28 September 2026