Week 20, 2026
May 11–17, 2026
Monday May 11 – Sunday May 172026-W20Days 131–137
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, May 11 | 2026-W20-1 | 131 | 20 | 24 Dhu al-Qa'dah 1447 AH | |
| Tue, May 12 | 2026-W20-2 | 132 | 20 | 25 Dhu al-Qa'dah 1447 AH | |
| Wed, May 13 | 2026-W20-3 | 133 | 20 | 26 Dhu al-Qa'dah 1447 AH | |
| Thu, May 14 | 2026-W20-4 | 134 | 20 | 27 Dhu al-Qa'dah 1447 AH | Ascension Day (France) |
| Fri, May 15 | 2026-W20-5 | 135 | 20 | 28 Dhu al-Qa'dah 1447 AH | |
| Sat, May 16 | 2026-W20-6 | 136 | 20 | 29 Dhu al-Qa'dah 1447 AH | |
| Sun, May 17 | 2026-W20-7 | 137 | 21 | 30 Dhu al-Qa'dah 1447 AH |
About week 20
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 20 and Sunday US week 21.
Holidays this week: Ascension Day on Thu, May 14 in France. All weeks of 2026 lists the neighbouring weeks.
Week 20 in other years
| Year | Week 20 runs |
|---|---|
| 2024 | Mon, May 13 – Sun, May 19 |
| 2025 | Mon, May 12 – Sun, May 18 |
| 2026 | Mon, May 11 – Sun, May 17 |
| 2027 | Mon, May 17 – Sun, May 23 |
| 2028 | Mon, May 15 – Sun, May 21 |
| 2029 | Mon, May 14 – Sun, May 20 |
In 2027, week 20 runs Mon, May 17 – Sun, May 23: 2026 has 53 weeks, so the same number comes 371 days later, 6 days later in the calendar. Over the 400-year cycle, the Monday of week 20 falls between May 10 and May 17.
By the end of week 20, 137 days of 2026 have passed (37.5% of the year), and 33 ISO weeks of 2026 remain. The week falls in Q2.
Writing week 20
ISO 8601 writes this week as 2026-W20 (basic format 2026W20), from 2026-W20-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.