Week Number Calculator
Quickly check the current week number of the year, supports any date.
Week Number Calculator
Calculate the ISO week number for any date. Displays the start and end dates of the week, and tracks the progression of the year. The week starts on Monday.
Current Week Number
第24周
/ 总 53 Weeks (2026)
Weeks Left: 29
Week Details
Start Date (Mon)2026-06-08
End Date (Sun)2026-06-14
Year Progress
Progress44.1%
Days Passed
161
Days Left
204
About This Tool
This is a simple and practical online week number calculator based on the ISO 8601 standard (week starts on Monday, the first week of the year contains the first Thursday). You can intuitively see which week of the year today is, or select any date to calculate its week number and the corresponding start/end dates. Additionally, the tool provides a year progress statistic to help you keep track of time. All calculations run locally in your browser for fast response and privacy.
Features
- 📅 Real-time: Instantly see the current week number of the year
- 🔍 Any Date: Select any date to calculate its ISO week number
- ⏱️ Week Details: Displays the exact start and end dates of the week
- 📊 Progress Tracker: Intuitively tracks year progress (days passed/left)
- 📆 Weeks Left: Clearly shows how many weeks until year end