Week 5, 2026
January 26 – February 1, 2026
Monday January 26 – Sunday February 12026-W05Days 26–32
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Jan 26 | 2026-W05-1 | 026 | 5 | 7 Sha'ban 1447 AH | Australia Day (4 sets) |
| Tue, Jan 27 | 2026-W05-2 | 027 | 5 | 8 Sha'ban 1447 AH | |
| Wed, Jan 28 | 2026-W05-3 | 028 | 5 | 9 Sha'ban 1447 AH | |
| Thu, Jan 29 | 2026-W05-4 | 029 | 5 | 10 Sha'ban 1447 AH | |
| Fri, Jan 30 | 2026-W05-5 | 030 | 5 | 11 Sha'ban 1447 AH | |
| Sat, Jan 31 | 2026-W05-6 | 031 | 5 | 12 Sha'ban 1447 AH | |
| Sun, Feb 1 | 2026-W05-7 | 032 | 6 | 13 Sha'ban 1447 AH |
About week 5
The week spans two months: it starts in January and ends in February, with February 1 on Sunday. In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 5 and Sunday US week 6.
Holidays this week: Australia Day on Mon, Jan 26 in 4 of the countries and regions we cover. All weeks of 2026 lists the neighbouring weeks.
Week 5 in other years
| Year | Week 5 runs |
|---|---|
| 2024 | Mon, Jan 29 – Sun, Feb 4 |
| 2025 | Mon, Jan 27 – Sun, Feb 2 |
| 2026 | Mon, Jan 26 – Sun, Feb 1 |
| 2027 | Mon, Feb 1 – Sun, Feb 7 |
| 2028 | Mon, Jan 31 – Sun, Feb 6 |
| 2029 | Mon, Jan 29 – Sun, Feb 4 |
In 2027, week 5 runs Mon, Feb 1 – Sun, Feb 7: 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 5 falls between January 26 and February 1.
By the end of week 5, 32 days of 2026 have passed (8.8% of the year), and 48 ISO weeks of 2026 remain. The week falls in Q1.
Writing week 5
ISO 8601 writes this week as 2026-W05 (basic format 2026W05), from 2026-W05-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.