Week 15, 2027
April 12–18, 2027
Monday April 12 – Sunday April 182027-W15Days 102–108
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Apr 12 | 2027-W15-1 | 102 | 16 | 5 Dhu al-Qa'dah 1448 AH | |
| Tue, Apr 13 | 2027-W15-2 | 103 | 16 | 6 Dhu al-Qa'dah 1448 AH | |
| Wed, Apr 14 | 2027-W15-3 | 104 | 16 | 7 Dhu al-Qa'dah 1448 AH | |
| Thu, Apr 15 | 2027-W15-4 | 105 | 16 | 8 Dhu al-Qa'dah 1448 AH | |
| Fri, Apr 16 | 2027-W15-5 | 106 | 16 | 9 Dhu al-Qa'dah 1448 AH | |
| Sat, Apr 17 | 2027-W15-6 | 107 | 16 | 10 Dhu al-Qa'dah 1448 AH | |
| Sun, Apr 18 | 2027-W15-7 | 108 | 17 | 11 Dhu al-Qa'dah 1448 AH |
About week 15
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 16 and Sunday US week 17.
None of the 17 national holiday sets we cover has a public holiday in this week; regional holidays are on the country pages. All weeks of 2027 lists the neighbouring weeks.
Week 15 in other years
| Year | Week 15 runs |
|---|---|
| 2025 | Mon, Apr 7 – Sun, Apr 13 |
| 2026 | Mon, Apr 6 – Sun, Apr 12 |
| 2027 | Mon, Apr 12 – Sun, Apr 18 |
| 2028 | Mon, Apr 10 – Sun, Apr 16 |
| 2029 | Mon, Apr 9 – Sun, Apr 15 |
| 2030 | Mon, Apr 8 – Sun, Apr 14 |
In 2028, week 15 runs Mon, Apr 10 – Sun, Apr 16: 364 days later, 2 days earlier in the calendar. Over the 400-year cycle, the Monday of week 15 falls between April 5 and April 12.
By the end of week 15, 108 days of 2027 have passed (29.6% of the year), and 37 ISO weeks of 2027 remain. The week falls in Q2.
Writing week 15
ISO 8601 writes this week as 2027-W15 (basic format 2027W15), from 2027-W15-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.