📆 星期几查询Day of the Week Calculator
查询任意日期是星期几，以及该日是一年中的第几天、第几周、第几季度、当月天数。Find the weekday of any date, plus day of year, ISO week, quarter and days in month.
使用说明与常见问题How-to & FAQ
「星期几查询」是什么？What is the Day of the Week Calculator?
查询任意日期是星期几，以及该日是一年中的第几天、第几周、第几季度、当月天数。Find the weekday of any date, plus day of year, ISO week, quarter and days in month.
如何使用「星期几查询」？How do I use the Day of the Week Calculator?
在「星期几查询」中，填写「日期」等参数，结果会随输入实时计算并显示在下方。In the Day of the Week Calculator: Fill in "Date"; results are recalculated instantly as you type.
时区如何处理？How are time zones handled?
「星期几查询」默认使用你设备的本地时区（按浏览器设置），夏令时由浏览器自动处理。The Day of the Week Calculator uses your device's local time zone by default, and daylight saving time is handled by the browser.
「星期几查询」免费吗？需要注册吗？Is the Day of the Week Calculator free? Do I need an account?
「星期几查询」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Day of the Week Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.