📊 分析日历日期Analyze Calendar Date
给出星期、年积日、当季、是否闰年、儒略日等。本地处理。Weekday, day of year, quarter, leap year, Julian day number and more. Processed locally.
使用说明与常见问题How-to & FAQ
「分析日历日期」是什么？What is the Analyze Calendar Date tool?
给出星期、年积日、当季、是否闰年、儒略日等。本地处理。Weekday, day of year, quarter, leap year, Julian day number and more. Processed locally.
如何使用「分析日历日期」？How do I use the Analyze Calendar Date tool?
输入一个 YYYY-MM-DD 日期，下方会列出星期、年积日、季度、是否闰年、儒略日数 JDN 和当天 00:00 UT 的儒略日 JD。Enter a date as YYYY-MM-DD to see its weekday, day of the year, quarter, whether the year is a leap year, its Julian Day Number and its Julian date at 00:00 UT.
JDN 和 JD 有什么区别？What is the difference between JDN and JD?
儒略日数 JDN 是天文用的连续整数日编号，每个儒略日从世界时（UT）正午 12:00 开始，所以 JDN 对应的是这一天正午那一刻；儒略日 JD 是带小数的连续时间，当天 00:00 UT 的 JD = JDN − 0.5。例如 2026-10-20 的 JDN 是 2461334，当天 00:00 UT 的 JD 是 2461333.5。The Julian Day Number (JDN) is the continuous integer day count used in astronomy; each Julian day starts at noon (12:00 UT), so the JDN refers to the noon of that date. The Julian date (JD) is a continuous fractional count, and at 00:00 UT on the date JD = JDN − 0.5. For 2026-10-20 the JDN is 2461334 and the JD at 00:00 UT is 2461333.5.
用的是哪种历法？和时区有关吗？Which calendar is used, and do time zones matter?
所有日期都按外推格里高利历（proleptic Gregorian，即把现行公历规则向前一直沿用）计算，年份 0000–9999，0000 年即公元前 1 年。1582 年 10 月 5 日到 14 日在历史上采用格里高利历时被跳过，从未实际存在；页面仍按外推公历计算这些日期，并在结果下方给出提示。计算只用你输入的日期，不读取设备时钟，所以时区和夏令时不影响结果。输出的年份总是 4 位（如 0005-06-07）。All dates are proleptic Gregorian: today's calendar rules applied backwards without a break, for years 0000–9999 (year 0000 is 1 BC). The days 1582-10-05 to 1582-10-14 never existed in the Gregorian calendar as historically adopted — they were skipped — so the page still computes them as proleptic dates but shows a note below the result. Only the dates you type are used and the device clock is never read, so time zones and daylight saving time do not affect the result. Years are always printed with 4 digits, e.g. 0005-06-07.
「分析日历日期」免费吗？需要注册吗？Is the Analyze Calendar Date tool free? Do I need an account?
「分析日历日期」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 Analyze Calendar 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.