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Calendar

2023 calendar

All twelve months of 2023, with ISO week numbers. Weeks start on Monday; switch to Sunday if you prefer.

Weeks start on
January — January, with ISO week numbers
WkMonTueWedThuFriSatSun
521
12345678
29101112131415
316171819202122
423242526272829
53031
February — February, with ISO week numbers
WkMonTueWedThuFriSatSun
512345
66789101112
713141516171819
820212223242526
92728
March — March, with ISO week numbers
WkMonTueWedThuFriSatSun
912345
106789101112
1113141516171819
1220212223242526
132728293031
April — April, with ISO week numbers
WkMonTueWedThuFriSatSun
1312
143456789
1510111213141516
1617181920212223
1724252627282930
May — May, with ISO week numbers
WkMonTueWedThuFriSatSun
181234567
19891011121314
2015161718192021
2122232425262728
22293031
June — June, with ISO week numbers
WkMonTueWedThuFriSatSun
221234
23567891011
2412131415161718
2519202122232425
262627282930
July — July, with ISO week numbers
WkMonTueWedThuFriSatSun
2612
273456789
2810111213141516
2917181920212223
3024252627282930
3131
August — August, with ISO week numbers
WkMonTueWedThuFriSatSun
31123456
3278910111213
3314151617181920
3421222324252627
3528293031
September — September, with ISO week numbers
WkMonTueWedThuFriSatSun
35123
3645678910
3711121314151617
3818192021222324
39252627282930
October — October, with ISO week numbers
WkMonTueWedThuFriSatSun
391
402345678
419101112131415
4216171819202122
4323242526272829
443031
November — November, with ISO week numbers
WkMonTueWedThuFriSatSun
4412345
456789101112
4613141516171819
4720212223242526
4827282930
December — December, with ISO week numbers
WkMonTueWedThuFriSatSun
48123
4945678910
5011121314151617
5118192021222324
5225262728293031

Calendar

2023 at a glance

01Days

365

02ISO weeks

52

2023 has 52 ISO weeks; week 1 starts on Monday, 2 January 2023.

03Starts on

Sunday, 1 January 2023

04Ends on

Sunday, 31 December 2023

05Is 2023 a leap year?

2023 is not a leap year: 365 days. The next leap year is 2024.

Clock changes

Clock changes in 2023

01European Union and the UK (shown in Paris time)

Sunday, 26 March 2023 at 02:00: clocks go forward 1 hour to 03:00 (CET → CEST).

Sunday, 29 October 2023 at 03:00: clocks go back 1 hour to 02:00 (CEST → CET).

The EU and the UK change at 01:00 UTC on the last Sunday of March and of October, at the same moment in every country.

02United States and most of Canada (shown in New York time)

Sunday, 12 March 2023 at 02:00: clocks go forward 1 hour to 03:00 (EST → EDT).

Sunday, 5 November 2023 at 02:00: clocks go back 1 hour to 01:00 (EDT → EST).

03Your time zone

How it works

ISO week numbers

ISO 8601 weeks start on Monday, and week 1 is the week that contains the year’s first Thursday (equivalently, 4 January). A year therefore has 52 or 53 weeks, and the first days of January can belong to the last week of the previous year.

The Gregorian leap-year rule: a year divisible by 4 is a leap year, except years divisible by 100, unless they are also divisible by 400. So 2000 was a leap year and 2100 will not be.

Other years

Questions

Good to know

How many weeks are there in 2023?

2023 has 52 ISO weeks; week 1 starts on Monday, 2 January 2023.

Is 2023 a leap year?

2023 is not a leap year: 365 days. The next leap year is 2024.

When do the clocks change in 2023?

In the EU and the UK: Sunday, 26 March 2023 at 02:00: clocks go forward 1 hour to 03:00 (CET → CEST); Sunday, 29 October 2023 at 03:00: clocks go back 1 hour to 02:00 (CEST → CET). In the US: Sunday, 12 March 2023 at 02:00: clocks go forward 1 hour to 03:00 (EST → EDT); Sunday, 5 November 2023 at 02:00: clocks go back 1 hour to 01:00 (EDT → EST).