使用方法
- Pick a date using the date picker。
- Read the ISO week number (W01–W53), quarter, week-of-month, and weekday in the result card。
- Check the ISO year shown below — it may differ from the calendar year near year boundaries。
- Use the share button to bookmark the result for a specific date。
範例
- Selecting 2025-12-29 (Monday) returns W01 of ISO year 2026, quarter Q4, because that Monday starts the first ISO week of 2026。
- Selecting 2026-06-09 returns W24, Q2, with Tuesday as the weekday。