Week Numbers 2020

What Week of the Year Is It

How many ISO weeks are in 2020?

Answer

2020 had

53 ISO weeks

2020 ended on Thursday, December 31, 2020. Its last ISO week, week 53, ran until Sunday, January 3, 2021.

January 1, 2020, is a Wednesday, a leap year → 53 ISO weeks (53 only when January 1 is a Thursday, or a Wednesday in a leap year)

Next

All 53 ISO weeks of 2020

Week	Monday	Sunday
1	Dec 30, 2019	Jan 5, 2020
2	Jan 6, 2020	Jan 12, 2020
3	Jan 13, 2020	Jan 19, 2020
4	Jan 20, 2020	Jan 26, 2020
5	Jan 27, 2020	Feb 2, 2020
6	Feb 3, 2020	Feb 9, 2020
7	Feb 10, 2020	Feb 16, 2020
8	Feb 17, 2020	Feb 23, 2020
9	Feb 24, 2020	Mar 1, 2020
10	Mar 2, 2020	Mar 8, 2020
11	Mar 9, 2020	Mar 15, 2020
12	Mar 16, 2020	Mar 22, 2020
13	Mar 23, 2020	Mar 29, 2020
14	Mar 30, 2020	Apr 5, 2020
15	Apr 6, 2020	Apr 12, 2020
16	Apr 13, 2020	Apr 19, 2020
17	Apr 20, 2020	Apr 26, 2020
18	Apr 27, 2020	May 3, 2020
19	May 4, 2020	May 10, 2020
20	May 11, 2020	May 17, 2020
21	May 18, 2020	May 24, 2020
22	May 25, 2020	May 31, 2020
23	Jun 1, 2020	Jun 7, 2020
24	Jun 8, 2020	Jun 14, 2020
25	Jun 15, 2020	Jun 21, 2020
26	Jun 22, 2020	Jun 28, 2020
27	Jun 29, 2020	Jul 5, 2020
28	Jul 6, 2020	Jul 12, 2020
29	Jul 13, 2020	Jul 19, 2020
30	Jul 20, 2020	Jul 26, 2020
31	Jul 27, 2020	Aug 2, 2020
32	Aug 3, 2020	Aug 9, 2020
33	Aug 10, 2020	Aug 16, 2020
34	Aug 17, 2020	Aug 23, 2020
35	Aug 24, 2020	Aug 30, 2020
36	Aug 31, 2020	Sep 6, 2020
37	Sep 7, 2020	Sep 13, 2020
38	Sep 14, 2020	Sep 20, 2020
39	Sep 21, 2020	Sep 27, 2020
40	Sep 28, 2020	Oct 4, 2020
41	Oct 5, 2020	Oct 11, 2020
42	Oct 12, 2020	Oct 18, 2020
43	Oct 19, 2020	Oct 25, 2020
44	Oct 26, 2020	Nov 1, 2020
45	Nov 2, 2020	Nov 8, 2020
46	Nov 9, 2020	Nov 15, 2020
47	Nov 16, 2020	Nov 22, 2020
48	Nov 23, 2020	Nov 29, 2020
49	Nov 30, 2020	Dec 6, 2020
50	Dec 7, 2020	Dec 13, 2020
51	Dec 14, 2020	Dec 20, 2020
52	Dec 21, 2020	Dec 27, 2020
53	Dec 28, 2020	Jan 3, 2021

ISO weeks are always whole, Monday to Sunday, so the numbering of 2020 starts on Monday, December 30, 2019, and ends on Sunday, January 3, 2021.

Other ways to count the weeks of 2020

Counted as whole blocks of seven days inside the calendar year, 2020 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) 2020 has 52 weeks, and week 1 starts on Sunday, December 29, 2019.

See Also

Date Calculator - Add to or Subtract Days/Weeks/Months or Years from Today
Weeks and Days Ago From Today - Calculate what day was it Weeks and Days Ago From Today
Days Between Two Dates - Calculate the Difference Between Two Dates. How many days, months, and years are between two dates? From date to date calculator
Days until Date - How many days, weeks, months and years until a Date. How Many Days Until My Birthday? Countdown to date
Calendar by Month and Year - A month or a whole year laid out by weekday, with ISO week numbers and holidays
How Many Weeks Are in a Year - Days, weeks, months, hours, minutes and seconds in a named year, leap years included
What Day of the Week Is It - Find the day of the week of any date. What day of week was or will be a date
What Day of the Year Is It - Today's day number, the days and weeks left until the end of the year and the share of it already gone

ISO Weeks in Nearby Years

Year	ISO weeks	Week 1 starts → last week ends
2020	53	Dec 30, 2019 → Jan 3, 2021
2021	52	Jan 4, 2021 → Jan 2, 2022
2022	52	Jan 3, 2022 → Jan 1, 2023
2023	52	Jan 2, 2023 → Dec 31, 2023
2024	52	Jan 1, 2024 → Dec 29, 2024
2025	52	Dec 30, 2024 → Dec 28, 2025
2026	53	Dec 29, 2025 → Jan 3, 2027
2027	52	Jan 4, 2027 → Jan 2, 2028
2028	52	Jan 3, 2028 → Dec 31, 2028
2029	52	Jan 1, 2029 → Dec 30, 2029
2030	52	Dec 31, 2029 → Dec 29, 2030

FAQ

How many ISO weeks are in 2020?

2020 had 53 ISO weeks

When does week 1 of 2020 start?

Week 1 of 2020 runs from Monday, December 30, 2019, to Sunday, January 5, 2020. It is the week that contains the first Thursday of the year, January 2, 2020.

When does the last week of 2020 end?

The last ISO week of 2020 is week 53: Monday, December 28, 2020, to Sunday, January 3, 2021.

Why does 2020 have 53 ISO weeks?

2020 starts on a Wednesday and ends on a Thursday, and it is a leap year of 366 days. A year has 53 ISO weeks when 1 January is a Thursday, or a Wednesday in a leap year — here it is a Wednesday, and the year is a leap year.

See Also