📅 日期计算器Date Difference Calculator
计算两个日期之间相差多少天、周、月，或计算某日期加减天数后的日期。Days between two dates, or add/subtract days from a date.
使用说明与常见问题How-to & FAQ
「日期计算器」是什么？What is the Date Difference Calculator?
计算两个日期之间相差多少天、周、月，或计算某日期加减天数后的日期。Days between two dates, or add/subtract days from a date.
如何使用「日期计算器」？How do I use the Date Difference Calculator?
在「日期计算器」中，在上方填写或选择所需内容，结果会实时显示在下方；所有处理都在浏览器本地完成。In the Date Difference Calculator: Fill in or choose the options above and the result appears below instantly; everything runs locally in your browser.
计算结果包含结束日期吗？Is the end date included?
不包含。若需包含首尾两天，请在结果上加 1。No. Add 1 if you want to count both start and end days.
时区如何处理？How are time zones handled?
「日期计算器」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 Date Difference Calculator uses your device's local time zone by default, and daylight saving time is handled by the browser.
「日期计算器」免费吗？需要注册吗？Is the Date Difference Calculator free? Do I need an account?
「日期计算器」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 Date Difference 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.