January 19 – January 25, 2026 · 2026-W04 · ~5% through 2026
Week Details
| Week number | 4 |
| Year | 2026 |
| ISO notation | 2026-W04 |
| Start date | Monday, January 19, 2026 |
| End date | Sunday, January 25, 2026 |
| Working days | 5 (Mon–Fri) |
| Year progress | 5% |
Days in This Week
Mon Today
Jan 19 Tue Today
Jan 20 Wed Today
Jan 21 Thu Today
Jan 22 Fri Today
Jan 23 Sat Today
Jan 24 Sun Today
Jan 25 All Weeks of 2026
Week 4 in Other Years
| Year | Start | End |
|---|---|---|
| 2027 | Jan 25, 2027 | Jan 31, 2027 |
Frequently Asked Questions
What dates are in week 4 of 2026?
Week 4 of 2026 starts on Monday, January 19, 2026 and ends on Sunday, January 25, 2026. It contains 5 working days (Monday–Friday) and a 2-day weekend (Saturday–Sunday).
What is the ISO notation for week 4, 2026?
The ISO 8601 week date notation is 2026-W04. Individual days are written as 2026-W04-1 (Monday) through 2026-W04-7 (Sunday).
How far through 2026 is week 4?
Week 4 begins around day 19 of 365, which is approximately 5% through the year.