January 4 – January 10, 2027 · 2027-W01 · ~1% through 2027
Week Details
| Week number | 1 |
| Year | 2027 |
| ISO notation | 2027-W01 |
| Start date | Monday, January 4, 2027 |
| End date | Sunday, January 10, 2027 |
| Working days | 5 (Mon–Fri) |
| Year progress | 1% |
Days in This Week
Mon Today
Jan 4 Tue Today
Jan 5 Wed Today
Jan 6 Thu Today
Jan 7 Fri Today
Jan 8 Sat Today
Jan 9 Sun Today
Jan 10 All Weeks of 2027
Week 1 in Other Years
| Year | Start | End |
|---|---|---|
| 2026 | Dec 29, 2025 | Jan 4, 2026 |
Frequently Asked Questions
What dates are in week 1 of 2027?
Week 1 of 2027 starts on Monday, January 4, 2027 and ends on Sunday, January 10, 2027. It contains 5 working days (Monday–Friday) and a 2-day weekend (Saturday–Sunday).
What is the ISO notation for week 1, 2027?
The ISO 8601 week date notation is 2027-W01. Individual days are written as 2027-W01-1 (Monday) through 2027-W01-7 (Sunday).
How far through 2027 is week 1?
Week 1 begins around day 4 of 365, which is approximately 1% through the year.