🔭 儒略日转日期Convert Julian Day to Date

使用说明与常见问题How-to & FAQ

「儒略日转日期」是什么？What is the Convert Julian Day to Date tool?

把儒略日编号 JDN（整数）或带小数的儒略日 JD 换成公历日期与 UT 时间。本地处理。Convert a Julian Day Number (integer) or a fractional Julian date to a Gregorian date and UT time. Processed locally.

如何使用「儒略日转日期」？How do I use the Convert Julian Day to Date tool?

输入儒略日编号（如 2451545）得到日期，或输入带小数的儒略日（如 2451544.5）得到日期和 UT 时间。Enter a Julian Day Number such as 2451545 to get the date, or a fractional Julian date such as 2451544.5 to get the date and UT time.

JDN 和 JD 有什么区别？What is the difference between JDN and JD?

整数输入按儒略日编号 JDN 处理，只给出日期；带小数点的输入按儒略日 JD 处理，并给出 UT 时间。JD 从正午起算，所以 2451544.5 是 2000-01-01 00:00 UT，2451545.0 是同日 12:00 UT。Whole numbers are read as a Julian Day Number and give just the date. Input with a decimal point is read as a Julian date and also gives the UT time. A JD starts at noon, so 2451544.5 is 2000-01-01 00:00 UT and 2451545.0 is 12:00 UT the same day.

早期日期怎么显示？How are early dates shown?

按外推格里高利历显示，年份 4 位补零，公元前用天文纪年的负年份（如 JDN 0 = -4713-11-24）。On the proleptic Gregorian calendar with 4-digit years; years before 1 AD use astronomical negative years (JDN 0 is -4713-11-24).

和时区有关吗？Do time zones matter?

无关。JD 定义在世界时 UT 上，结果总是 UT 时间，不使用设备时区。No. Julian dates are defined in Universal Time, so the result is always UT and your device time zone is not used.

输入和输出是什么样的？What does the input and output look like?

例如输入 2451545，输出为：2000-01-01。The input 2451545 becomes 2000-01-01.

「儒略日转日期」免费吗？需要注册吗？Is the Convert Julian Day to Date tool free? Do I need an account?

「儒略日转日期」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 Convert Julian Day to Date tool is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.