Week 20, 2027
May 17–23, 2027
Monday May 17 – Sunday May 232027-W20Days 137–143
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, May 17 | 2027-W20-1 | 137 | 21 | 11 Dhu al-Hijjah 1448 AH | Hari Raya Haji (Singapore); Whit Monday (France) |
| Tue, May 18 | 2027-W20-2 | 138 | 21 | 12 Dhu al-Hijjah 1448 AH | |
| Wed, May 19 | 2027-W20-3 | 139 | 21 | 13 Dhu al-Hijjah 1448 AH | |
| Thu, May 20 | 2027-W20-4 | 140 | 21 | 14 Dhu al-Hijjah 1448 AH | Vesak Day (Singapore) |
| Fri, May 21 | 2027-W20-5 | 141 | 21 | 15 Dhu al-Hijjah 1448 AH | |
| Sat, May 22 | 2027-W20-6 | 142 | 21 | 16 Dhu al-Hijjah 1448 AH | |
| Sun, May 23 | 2027-W20-7 | 143 | 22 | 17 Dhu al-Hijjah 1448 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 21 and Sunday US week 22.
Holidays this week: Hari Raya Haji on Mon, May 17 in Singapore; Whit Monday on Mon, May 17 in France; Vesak Day on Thu, May 20 in Singapore. All weeks of 2027 lists the neighbouring weeks.
Week 20 in other years
| Year | Week 20 runs |
|---|---|
| 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 |
| 2030 | Mon, May 13 – Sun, May 19 |
In 2028, week 20 runs Mon, May 15 – Sun, May 21: 364 days later, 2 days earlier 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, 143 days of 2027 have passed (39.2% of the year), and 32 ISO weeks of 2027 remain. The week falls in Q2.
Writing week 20
ISO 8601 writes this week as 2027-W20 (basic format 2027W20), from 2027-W20-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.