When is week 4?
In 2026, week 4 runs from Monday, January 19, 2026 to Sunday, January 25, 2026.
It ended 250 days ago.
Week 4 in other years
| Year | Starts | Ends |
|---|---|---|
| 2025 | Mon, Jan 20, 2025 | Sun, Jan 26, 2025 |
| 2026 | Mon, Jan 19, 2026 | Sun, Jan 25, 2026 |
| 2027 | Mon, Jan 25, 2027 | Sun, Jan 31, 2027 |
| 2028 | Mon, Jan 24, 2028 | Sun, Jan 30, 2028 |
Related
Questions & answers
What dates are in week 4?
In 2026, week 4 is January 19, 2026 to January 25, 2026.
How are week numbers counted?
We use ISO 8601 week numbers: weeks start on Monday, and week 1 is the week that contains the first Thursday of the year.