Week 16, 2026
April 13–19, 2026
Monday April 13 – Sunday April 192026-W16Days 103–109
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Apr 13 | 2026-W16-1 | 103 | 16 | 25 Shawwal 1447 AH | |
| Tue, Apr 14 | 2026-W16-2 | 104 | 16 | 26 Shawwal 1447 AH | |
| Wed, Apr 15 | 2026-W16-3 | 105 | 16 | 27 Shawwal 1447 AH | |
| Thu, Apr 16 | 2026-W16-4 | 106 | 16 | 28 Shawwal 1447 AH | |
| Fri, Apr 17 | 2026-W16-5 | 107 | 16 | 29 Shawwal 1447 AH | |
| Sat, Apr 18 | 2026-W16-6 | 108 | 16 | 1 Dhu al-Qa'dah 1447 AH | |
| Sun, Apr 19 | 2026-W16-7 | 109 | 17 | 2 Dhu al-Qa'dah 1447 AH |
About week 16
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. 1 Dhu al-Qa'dah 1447 AH falls on Sat, Apr 18 by the Umm al-Qura calendar (computed). All weeks of 2026 lists the neighbouring weeks.
Week 16 in other years
| Year | Week 16 runs |
|---|---|
| 2024 | Mon, Apr 15 – Sun, Apr 21 |
| 2025 | Mon, Apr 14 – Sun, Apr 20 |
| 2026 | Mon, Apr 13 – Sun, Apr 19 |
| 2027 | Mon, Apr 19 – Sun, Apr 25 |
| 2028 | Mon, Apr 17 – Sun, Apr 23 |
| 2029 | Mon, Apr 16 – Sun, Apr 22 |
In 2027, week 16 runs Mon, Apr 19 – Sun, Apr 25: 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 16 falls between April 12 and April 19.
By the end of week 16, 109 days of 2026 have passed (29.9% of the year), and 37 ISO weeks of 2026 remain. The week falls in Q2.
Writing week 16
ISO 8601 writes this week as 2026-W16 (basic format 2026W16), from 2026-W16-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.