52 Week Calendar 2025. Weekly calendar for week 52 of 2025 starting on sunday for the period of december 21, 2025 to december 27, 2025. The iso calendar weeks for 2025 are defined according to the international iso standard.
Calendar week (week number) 52 is from monday, december 22, 2025 until (and including) sunday, december 28, 2025. Week 52 begins on monday, december 25, 2023.