📆 闰年判断Leap Year Checker
判断某一年是否为闰年，并列出前后最近的闰年和该年天数、二月天数。Check if a year is a leap year and list nearby leap years.
使用说明与常见问题How-to & FAQ
「闰年判断」是什么？What is the Leap Year Checker tool?
判断某一年是否为闰年，并列出前后最近的闰年和该年天数、二月天数。Check if a year is a leap year and list nearby leap years.
如何使用「闰年判断」？How do I use the Leap Year Checker tool?
在「闰年判断」中，填写「年份」等参数，结果会随输入实时计算并显示在下方。In the Leap Year Checker: Fill in "Year"; results are recalculated instantly as you type.
和时区有关吗？Do time zones matter?
无关。「闰年判断」只按公历规则（能被 4 整除且不能被 100 整除，或能被 400 整除）判断你输入的年份，不读取设备时间，也不涉及钟点，所以时区和夏令时不影响结果。No. The Leap Year Checker applies the Gregorian rule (divisible by 4 and not by 100, or divisible by 400) to the years you enter; it never reads the device clock and involves no clock times, so time zones and daylight saving time do not affect the result.
「闰年判断」免费吗？需要注册吗？Is the Leap Year Checker free? Do I need an account?
「闰年判断」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 Leap Year Checker is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.