Week 3, 2026
January 12–18, 2026
Monday January 12 – Sunday January 182026-W03Days 12–18
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Jan 12 | 2026-W03-1 | 012 | 3 | 23 Rajab 1447 AH | Coming of Age Day (Japan) |
| Tue, Jan 13 | 2026-W03-2 | 013 | 3 | 24 Rajab 1447 AH | |
| Wed, Jan 14 | 2026-W03-3 | 014 | 3 | 25 Rajab 1447 AH | |
| Thu, Jan 15 | 2026-W03-4 | 015 | 3 | 26 Rajab 1447 AH | |
| Fri, Jan 16 | 2026-W03-5 | 016 | 3 | 27 Rajab 1447 AH | |
| Sat, Jan 17 | 2026-W03-6 | 017 | 3 | 28 Rajab 1447 AH | |
| Sun, Jan 18 | 2026-W03-7 | 018 | 4 | 29 Rajab 1447 AH |
About week 3
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 3 and Sunday US week 4.
Holidays this week: Coming of Age Day on Mon, Jan 12 in Japan. All weeks of 2026 lists the neighbouring weeks.
Week 3 in other years
| Year | Week 3 runs |
|---|---|
| 2024 | Mon, Jan 15 – Sun, Jan 21 |
| 2025 | Mon, Jan 13 – Sun, Jan 19 |
| 2026 | Mon, Jan 12 – Sun, Jan 18 |
| 2027 | Mon, Jan 18 – Sun, Jan 24 |
| 2028 | Mon, Jan 17 – Sun, Jan 23 |
| 2029 | Mon, Jan 15 – Sun, Jan 21 |
In 2027, week 3 runs Mon, Jan 18 – Sun, Jan 24: 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 3 falls between January 12 and January 18.
By the end of week 3, 18 days of 2026 have passed (4.9% of the year), and 50 ISO weeks of 2026 remain. The week falls in Q1.
Writing week 3
ISO 8601 writes this week as 2026-W03 (basic format 2026W03), from 2026-W03-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.