Week 53 of 2026 runs December 28 to January 3
ISO week 53 of 2026 begins on Monday, December 28, 2026 and ends on Sunday, January 3, 2027. It starts in 96 days, about 14 weeks from the current week 39. The week covers the turn from December into January, and it also straddles the turn of the calendar year.
What dates are in week 53?
| Weekday | Date | Day of year | Notes |
|---|---|---|---|
| Monday | December 28, 2026 | 362 | |
| Tuesday | December 29, 2026 | 363 | |
| Wednesday | December 30, 2026 | 364 | |
| Thursday | December 31, 2026 | 365 | New Year's Eve |
| Friday | January 1, 2027 | 1 | New Year's Day |
| Saturday | January 2, 2027 | 2 | |
| Sunday | January 3, 2027 | 3 |
Week 53 of 2026 contains New Year's Eve on December 31 and New Year's Day on January 1. The seven dates always run Monday through Sunday, which is the part of ISO 8601 that most often catches people out: a week that starts on Sunday is a different convention and gives a different number.
How ISO week 53 is worked out
ISO 8601 fixes week one as the week containing the first Thursday of January, which is the same as saying the week containing 4 January, or the week holding the majority of its days in the new year. Counting forward from there, week 53 is the 53rd Monday-to-Sunday block of 2026, which lands on December 28. Because the block crosses 31 December, some of its dates carry the calendar year 2026 and the rest carry 2027, while the whole week keeps the ISO year 2026. That split is exactly why ISO numbers weeks by their own year rather than by the calendar year.
When is week 53 in other years?
| Year | Monday | Sunday | Weeks in year |
|---|---|---|---|
| 2026 | December 28 | January 3 | 53 |
The Monday that opens week 53 moves each year, because a calendar year is never a whole number of weeks. Week 53 is the exception that only appears in long years, so this table skips the years that stop at 52.
How far away is week 53?
Today is Wednesday, September 23, 2026, which sits in ISO week 39 of 2026. Week 53 of 2026 opens in 96 days, so there are roughly 14 weeks to go. Counting only complete weeks between now and then gives 13.
Questions
- What dates are in week 53 of 2026?
- Monday December 28, 2026 through Sunday January 3, 2027.
- What week is it now?
- ISO week 39 of 2026. Today is Wednesday, September 23, 2026.
- How many weeks does 2026 have?
- 53. The 2026 week count page explains the rule.
- Do ISO weeks start on Monday or Sunday?
- Monday. A Sunday-first week is a different convention and can give a different week number for the same date.
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