Week 18 of the year
When is week 18? The exact Monday–Sunday dates of ISO week 18 for every year from 2024 to 2032.
Week 18 of 2026 runs from Monday, Apr 27, 2026 to Sunday, May 3, 2026 (Apr / May). Week 18 of 2026 has already passed (11 weeks ago). ISO week code: 2026-W18.
Week 18 dates by year
| Year | Week 18 starts (Mon) | Week 18 ends (Sun) | Month |
|---|---|---|---|
| 2024 | Monday, April 29, 2024 | Sunday, May 5, 2024 | Apr / May |
| 2025 | Monday, April 28, 2025 | Sunday, May 4, 2025 | Apr / May |
| 2026 | Monday, April 27, 2026 | Sunday, May 3, 2026 | Apr / May |
| 2027 | Monday, May 3, 2027 | Sunday, May 9, 2027 | May |
| 2028 | Monday, May 1, 2028 | Sunday, May 7, 2028 | May |
| 2029 | Monday, April 30, 2029 | Sunday, May 6, 2029 | Apr / May |
| 2030 | Monday, April 29, 2030 | Sunday, May 5, 2030 | Apr / May |
| 2031 | Monday, April 28, 2031 | Sunday, May 4, 2031 | Apr / May |
| 2032 | Monday, April 26, 2032 | Sunday, May 2, 2032 | Apr / May |
All weeks
Frequently asked questions
What month is week 18 in?
Week 18 typically falls in May. The exact dates shift by up to a few days from year to year because week 1 is anchored to January 4, not January 1.
How do I write week 18 as a week code?
The ISO code is the year plus W18 — for example 2026-W18, short form 26W18, or YYWW date code 2618. See week number formats.
Are these dates the same in every country?
Yes for ISO 8601 (Monday-start) numbering, which is what this table shows. US Sunday-start calendars can label the same days with a number one higher — see week start conventions.