Week 1 of 2026
Week 1 of 2026 runs from Monday, December 29, 2025, to Sunday, January 4, 2026. See every date, weekday count and adjacent ISO weeks.
ISO week 1December 29, 2025–January 4, 2026Monday through Sunday · 5 weekdays · 2 weekend days
Past
Week 1 at a glance
ISO code2026-W01
Calendar spanDecember and January
QuarterQ4 2025–Q1 2026
Day of year363 of 2025 – 4 of 2026
Dates in week 1
| Day | Date | Type |
|---|---|---|
| Monday | Weekday | |
| Tuesday | Weekday | |
| Wednesday | Weekday | |
| Thursday | Weekday | |
| Friday | Weekday | |
| Saturday | Weekend | |
| Sunday | Weekend |
About week 1 of 2026
Week 1 of 2026 runs from December 29, 2025 through January 4, 2026. It covers December and January and contains five standard Monday-to-Friday weekdays.
Public holidays are country-specific and are not removed from this basic weekday count. Use the working-days calculator when holidays need to be excluded.