Week 1, 2026: Dec 29 – Jan 4
odd week December / January 2026
Start date
Monday, December 29, 2025
End date
Sunday, January 4, 2026
ISO 8601 week (Monday to Sunday). In the US system used by Outlook and Excel WEEKNUM, this is week 53.
week 1
| Day | Date |
|---|---|
| Monday | Mon, Dec 29, 2025 |
| Tuesday | Tue, Dec 30, 2025 |
| Wednesday | Wed, Dec 31, 2025 |
| Thursday | Thu, Jan 1, 2026 |
| Friday | Fri, Jan 2, 2026 |
| Saturday | Sat, Jan 3, 2026 |
| Sunday | Sun, Jan 4, 2026 |