什麼是 週數計算器？
免費線上週數計算器。計算日期對應的 ISO 週數與週數差。
為什麼要使用 週數計算器？
- ISO 8601 week number with ISO year
- Day of year count with total days in year
- Quarter number and quarter date range
- Days remaining in the year and leap year detection
- Interactive monthly calendar with date highlighted
如何使用 週數計算器 — 逐步教學
1
Select a date using the date picker.
2
View the ISO week number and ISO year instantly.
3
See the day of year, days remaining, quarter, and weekday name.
4
Use the monthly calendar reference to visualize the date context.
週數計算器適合誰？
- 專案排程
- 薪資週期規劃
- 學術課表
- 製造生產週
週數計算器 — 常見問題
什麼是 ISO 週數？
ISO 8601 defines week numbers where week 1 is the week containing the first Thursday of the year. Weeks start on Monday, and each week belongs to the year that contains its Thursday.
一年有幾週？
Most years have 52 weeks, but about every 5-6 years, a year has 53 ISO weeks (e.g., 2020 had 53 weeks). The tool shows the exact week count for the selected year.
準備好使用 週數計算器 了嗎？
免費線上工具 — 在瀏覽器中運作，無需註冊。立即開始使用。
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