Week 42, 2027
October 18–24, 2027
Monday October 18 – Sunday October 242027-W42Days 291–297
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Oct 18 | 2027-W42-1 | 291 | 43 | 18 Jumada al-Ula 1449 AH | |
| Tue, Oct 19 | 2027-W42-2 | 292 | 43 | 19 Jumada al-Ula 1449 AH | |
| Wed, Oct 20 | 2027-W42-3 | 293 | 43 | 20 Jumada al-Ula 1449 AH | |
| Thu, Oct 21 | 2027-W42-4 | 294 | 43 | 21 Jumada al-Ula 1449 AH | |
| Fri, Oct 22 | 2027-W42-5 | 295 | 43 | 22 Jumada al-Ula 1449 AH | |
| Sat, Oct 23 | 2027-W42-6 | 296 | 43 | 23 Jumada al-Ula 1449 AH | |
| Sun, Oct 24 | 2027-W42-7 | 297 | 44 | 24 Jumada al-Ula 1449 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 43 and Sunday US week 44.
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 42 in other years
| Year | Week 42 runs |
|---|---|
| 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 |
| 2030 | Mon, Oct 14 – Sun, Oct 20 |
In 2028, week 42 runs Mon, Oct 16 – Sun, Oct 22: 364 days later, 2 days earlier 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, 297 days of 2027 have passed (81.4% of the year), and 10 ISO weeks of 2027 remain. The week falls in Q4.
Writing week 42
ISO 8601 writes this week as 2027-W42 (basic format 2027W42), from 2027-W42-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.