免费 · 日期与时间

星期几计算器.

查询任意日期是星期几，并显示一年中的第几天、ISO 周数、季度以及未来几年同一天是星期几。

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使用方法: 星期几计算器

输入数据或选择文件，调整设置并生成结果。复制或下载之前，请检查结果。

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英语技术说明

Gregorian calendar for every date. Everything is calculated in your browser; nothing you type is uploaded.

Dates are handled in UTC so time zones never shift the day. ISO weeks start on Monday; week 1 contains the year’s first Thursday.

11 October 2026 is a Sunday, day 284 of the year, in ISO week 41; 1 January 2027 still belongs to ISO week 53 of 2026.