Week 5 of 2026 runs January 26 to February 1
ISO week 5 of 2026 begins on Monday, January 26, 2026 and ends on Sunday, February 1, 2026. It has already passed; the current week is 39. The week covers the turn from January into February.
What dates are in week 5?
| Weekday | Date | Day of year | Notes |
|---|---|---|---|
| Monday | January 26, 2026 | 26 | |
| Tuesday | January 27, 2026 | 27 | |
| Wednesday | January 28, 2026 | 28 | |
| Thursday | January 29, 2026 | 29 | |
| Friday | January 30, 2026 | 30 | |
| Saturday | January 31, 2026 | 31 | |
| Sunday | February 1, 2026 | 32 |
No holiday or widely marked observance falls inside week 5 of 2026. 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 5 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 5 is the 5th Monday-to-Sunday block of 2026, which lands on January 26. All seven dates sit inside 2026, so the ISO year and the calendar year agree for this week.
When is week 5 in other years?
| Year | Monday | Sunday | Weeks in year |
|---|---|---|---|
| 2026 | January 26 | February 1 | 53 |
| 2027 | February 1 | February 7 | 52 |
| 2028 | January 31 | February 6 | 52 |
| 2029 | January 29 | February 4 | 52 |
| 2030 | January 28 | February 3 | 52 |
Week 5 shifts by a day or two each year because a year is 52 weeks plus one or two days, so the Monday that opens it moves from January 26 in 2026 to February 1 in 2027.
How far away is week 5?
Today is Wednesday, September 23, 2026, which sits in ISO week 39 of 2026. Week 5 of 2026 closed 234 days ago. The same week number in the following year is listed in the table above.
Questions
- What dates are in week 5 of 2026?
- Monday January 26, 2026 through Sunday February 1, 2026.
- 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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