Calendar 2025 Numbered Weeks. The first calendar week of 2025 starts on monday, december 30, 2024 and ends on sunday, january 5, 2025. 55 rows the year 2025 has 52 calendar weeks.
The following table shows all iso calendar weeks 2025 from 1 to 53, with their start date beginning on monday and their end date falling on sunday. The year 2025 ends on wednesday, december 31st 2025.