Week 20 of 2026 runs May 11 to May 17
ISO week 20 of 2026 begins on Monday, May 11, 2026 and ends on Sunday, May 17, 2026. It has already passed; the current week is 39. The week covers May only.
What dates are in week 20?
| Weekday | Date | Day of year | Notes |
|---|---|---|---|
| Monday | May 11, 2026 | 131 | |
| Tuesday | May 12, 2026 | 132 | |
| Wednesday | May 13, 2026 | 133 | |
| Thursday | May 14, 2026 | 134 | |
| Friday | May 15, 2026 | 135 | |
| Saturday | May 16, 2026 | 136 | |
| Sunday | May 17, 2026 | 137 |
No holiday or widely marked observance falls inside week 20 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 20 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 20 is the 20th Monday-to-Sunday block of 2026, which lands on May 11. All seven dates sit inside 2026, so the ISO year and the calendar year agree for this week.
When is week 20 in other years?
| Year | Monday | Sunday | Weeks in year |
|---|---|---|---|
| 2026 | May 11 | May 17 | 53 |
| 2027 | May 17 | May 23 | 52 |
| 2028 | May 15 | May 21 | 52 |
| 2029 | May 14 | May 20 | 52 |
| 2030 | May 13 | May 19 | 52 |
Week 20 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 May 11 in 2026 to May 17 in 2027.
How far away is week 20?
Today is Wednesday, September 23, 2026, which sits in ISO week 39 of 2026. Week 20 of 2026 closed 129 days ago. The same week number in the following year is listed in the table above.
Questions
- What dates are in week 20 of 2026?
- Monday May 11, 2026 through Sunday May 17, 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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