Week 18 of 2026 runs April 27 to May 3
ISO week 18 of 2026 begins on Monday, April 27, 2026 and ends on Sunday, May 3, 2026. It has already passed; the current week is 39. The week covers the turn from April into May.
What dates are in week 18?
| Weekday | Date | Day of year | Notes |
|---|---|---|---|
| Monday | April 27, 2026 | 117 | |
| Tuesday | April 28, 2026 | 118 | |
| Wednesday | April 29, 2026 | 119 | |
| Thursday | April 30, 2026 | 120 | |
| Friday | May 1, 2026 | 121 | |
| Saturday | May 2, 2026 | 122 | |
| Sunday | May 3, 2026 | 123 |
No holiday or widely marked observance falls inside week 18 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 18 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 18 is the 18th Monday-to-Sunday block of 2026, which lands on April 27. All seven dates sit inside 2026, so the ISO year and the calendar year agree for this week.
When is week 18 in other years?
| Year | Monday | Sunday | Weeks in year |
|---|---|---|---|
| 2026 | April 27 | May 3 | 53 |
| 2027 | May 3 | May 9 | 52 |
| 2028 | May 1 | May 7 | 52 |
| 2029 | April 30 | May 6 | 52 |
| 2030 | April 29 | May 5 | 52 |
Week 18 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 April 27 in 2026 to May 3 in 2027.
How far away is week 18?
Today is Wednesday, September 23, 2026, which sits in ISO week 39 of 2026. Week 18 of 2026 closed 143 days ago. The same week number in the following year is listed in the table above.
Questions
- What dates are in week 18 of 2026?
- Monday April 27, 2026 through Sunday May 3, 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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