Week 41, 2027
October 11–17, 2027
Monday October 11 – Sunday October 172027-W41Days 284–290
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Oct 11 | 2027-W41-1 | 284 | 42 | 11 Jumada al-Ula 1449 AH | Columbus Day (United States (federal)); Thanksgiving Day (Canada (federal)); Sports Day (Japan); Yom Kippur |
| Tue, Oct 12 | 2027-W41-2 | 285 | 42 | 12 Jumada al-Ula 1449 AH | National Day of Spain (Spain) |
| Wed, Oct 13 | 2027-W41-3 | 286 | 42 | 13 Jumada al-Ula 1449 AH | |
| Thu, Oct 14 | 2027-W41-4 | 287 | 42 | 14 Jumada al-Ula 1449 AH | |
| Fri, Oct 15 | 2027-W41-5 | 288 | 42 | 15 Jumada al-Ula 1449 AH | |
| Sat, Oct 16 | 2027-W41-6 | 289 | 42 | 16 Jumada al-Ula 1449 AH | |
| Sun, Oct 17 | 2027-W41-7 | 290 | 43 | 17 Jumada al-Ula 1449 AH |
About week 41
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 11 in United States (federal); Thanksgiving Day on Mon, Oct 11 in Canada (federal); Sports Day on Mon, Oct 11 in Japan; National Day of Spain on Tue, Oct 12 in Spain. Also this week: Yom Kippur on Mon, Oct 11 (10 Tishrei; begins at sunset the evening before). All weeks of 2027 lists the neighbouring weeks.
Week 41 in other years
| Year | Week 41 runs |
|---|---|
| 2025 | Mon, Oct 6 – Sun, Oct 12 |
| 2026 | Mon, Oct 5 – Sun, Oct 11 |
| 2027 | Mon, Oct 11 – Sun, Oct 17 |
| 2028 | Mon, Oct 9 – Sun, Oct 15 |
| 2029 | Mon, Oct 8 – Sun, Oct 14 |
| 2030 | Mon, Oct 7 – Sun, Oct 13 |
In 2028, week 41 runs Mon, Oct 9 – Sun, Oct 15: 364 days later, 2 days earlier in the calendar. Over the 400-year cycle, the Monday of week 41 falls between October 4 and October 11.
By the end of week 41, 290 days of 2027 have passed (79.5% of the year), and 11 ISO weeks of 2027 remain. The week falls in Q4.
Writing week 41
ISO 8601 writes this week as 2027-W41 (basic format 2027W41), from 2027-W41-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.