Week Numbers 2024

What Week of the Year Is It
Week numbers of

How many ISO weeks are in 2024?

Answer

had
52 ISO weeks

2024 ended on Tuesday, December 31, 2024. Its last ISO week, week 52, ran until Sunday, December 29, 2024.

January 1, 2024, is a Monday, a leap year → 52 ISO weeks (53 only when January 1 is a Thursday, or a Wednesday in a leap year)

All 52 ISO weeks of 2024

WeekMondaySunday
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52

ISO weeks are always whole, Monday to Sunday, so the numbering of 2024 starts on Monday, January 1, 2024, and ends on Sunday, December 29, 2024.

Other ways to count the weeks of 2024

Counted as whole blocks of seven days inside the calendar year, 2024 is 366 = 52 × 7 + 2, that is 52 weeks and 2 days. Both are true: the numbered ISO weeks are whole, so the first and the last of them may borrow days from the neighbouring years.

In the US numbering (weeks from Sunday, week 1 is the week that contains January 1) 2024 has 52 weeks, and week 1 starts on Sunday, December 31, 2023.

See Also

ISO Weeks in Nearby Years

YearISO weeksWeek 1 starts → last week ends
202053Dec 30, 2019 → Jan 3, 2021
202152Jan 4, 2021 → Jan 2, 2022
202252Jan 3, 2022 → Jan 1, 2023
202352Jan 2, 2023 → Dec 31, 2023
202452Jan 1, 2024 → Dec 29, 2024
202552Dec 30, 2024 → Dec 28, 2025
202653Dec 29, 2025 → Jan 3, 2027
202752Jan 4, 2027 → Jan 2, 2028
202852Jan 3, 2028 → Dec 31, 2028
202952Jan 1, 2029 → Dec 30, 2029
203052Dec 31, 2029 → Dec 29, 2030

FAQ

How many ISO weeks are in 2024?

2024 had 52 ISO weeks

When does week 1 of 2024 start?

Week 1 of 2024 runs from Monday, January 1, 2024, to Sunday, January 7, 2024. It is the week that contains the first Thursday of the year, January 4, 2024.

When does the last week of 2024 end?

The last ISO week of 2024 is week 52: Monday, December 23, 2024, to Sunday, December 29, 2024. December 31, 2024, already belongs to week 1 of 2025.

Why does 2024 have 52 ISO weeks?

2024 starts on a Monday and ends on a Tuesday, and it is a leap year of 366 days. A year has 53 ISO weeks only when 1 January is a Thursday, or a Wednesday in a leap year; neither holds here, so it has 52.