Week 42, 2026
October 12–18, 2026
Monday October 12 – Sunday October 182026-W42Days 285–291
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Oct 12 | 2026-W42-1 | 285 | 42 | 1 Jumada al-Ula 1448 AH | Columbus Day (United States (federal)); Thanksgiving Day (Canada (federal)); Sports Day (Japan); National Day of Spain (Spain) |
| Tue, Oct 13 | 2026-W42-2 | 286 | 42 | 2 Jumada al-Ula 1448 AH | |
| Wed, Oct 14 | 2026-W42-3 | 287 | 42 | 3 Jumada al-Ula 1448 AH | |
| Thu, Oct 15 | 2026-W42-4 | 288 | 42 | 4 Jumada al-Ula 1448 AH | |
| Fri, Oct 16 | 2026-W42-5 | 289 | 42 | 5 Jumada al-Ula 1448 AH | |
| Sat, Oct 17 | 2026-W42-6 | 290 | 42 | 6 Jumada al-Ula 1448 AH | |
| Sun, Oct 18 | 2026-W42-7 | 291 | 43 | 7 Jumada al-Ula 1448 AH |
About week 42
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 42 and Sunday US week 43.
Holidays this week: Columbus Day on Mon, Oct 12 in United States (federal); Thanksgiving Day on Mon, Oct 12 in Canada (federal); Sports Day on Mon, Oct 12 in Japan; National Day of Spain on Mon, Oct 12 in Spain. 1 Jumada al-Ula 1448 AH falls on Mon, Oct 12 by the Umm al-Qura calendar (computed). All weeks of 2026 lists the neighbouring weeks.
Week 42 in other years
| Year | Week 42 runs |
|---|---|
| 2024 | Mon, Oct 14 – Sun, Oct 20 |
| 2025 | Mon, Oct 13 – Sun, Oct 19 |
| 2026 | Mon, Oct 12 – Sun, Oct 18 |
| 2027 | Mon, Oct 18 – Sun, Oct 24 |
| 2028 | Mon, Oct 16 – Sun, Oct 22 |
| 2029 | Mon, Oct 15 – Sun, Oct 21 |
In 2027, week 42 runs Mon, Oct 18 – Sun, Oct 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 42 falls between October 11 and October 18.
By the end of week 42, 291 days of 2026 have passed (79.7% of the year), and 11 ISO weeks of 2026 remain. The week falls in Q4.
Writing week 42
ISO 8601 writes this week as 2026-W42 (basic format 2026W42), from 2026-W42-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.