Week 21, 2027
May 24–30, 2027
Monday May 24 – Sunday May 302027-W21Days 144–150
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, May 24 | 2027-W21-1 | 144 | 22 | 18 Dhu al-Hijjah 1448 AH | Victoria Day (Canada (federal)) |
| Tue, May 25 | 2027-W21-2 | 145 | 22 | 19 Dhu al-Hijjah 1448 AH | |
| Wed, May 26 | 2027-W21-3 | 146 | 22 | 20 Dhu al-Hijjah 1448 AH | |
| Thu, May 27 | 2027-W21-4 | 147 | 22 | 21 Dhu al-Hijjah 1448 AH | |
| Fri, May 28 | 2027-W21-5 | 148 | 22 | 22 Dhu al-Hijjah 1448 AH | |
| Sat, May 29 | 2027-W21-6 | 149 | 22 | 23 Dhu al-Hijjah 1448 AH | |
| Sun, May 30 | 2027-W21-7 | 150 | 23 | 24 Dhu al-Hijjah 1448 AH |
About week 21
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 22 and Sunday US week 23.
Holidays this week: Victoria Day on Mon, May 24 in Canada (federal). All weeks of 2027 lists the neighbouring weeks.
Week 21 in other years
| Year | Week 21 runs |
|---|---|
| 2025 | Mon, May 19 – Sun, May 25 |
| 2026 | Mon, May 18 – Sun, May 24 |
| 2027 | Mon, May 24 – Sun, May 30 |
| 2028 | Mon, May 22 – Sun, May 28 |
| 2029 | Mon, May 21 – Sun, May 27 |
| 2030 | Mon, May 20 – Sun, May 26 |
In 2028, week 21 runs Mon, May 22 – Sun, May 28: 364 days later, 2 days earlier in the calendar. Over the 400-year cycle, the Monday of week 21 falls between May 17 and May 24.
By the end of week 21, 150 days of 2027 have passed (41.1% of the year), and 31 ISO weeks of 2027 remain. The week falls in Q2.
Writing week 21
ISO 8601 writes this week as 2027-W21 (basic format 2027W21), from 2027-W21-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.