📆 按年积日查日期Find Date by Day of Year
输入年份与年积日（1-365/366），得到对应日期。本地处理。From a year and day-of-year (1-365/366), get the calendar date. Processed locally.
使用说明与常见问题How-to & FAQ
「按年积日查日期」是什么？What is the Find Date by Day of Year tool?
输入年份与年积日（1-365/366），得到对应日期。本地处理。From a year and day-of-year (1-365/366), get the calendar date. Processed locally.
如何使用「按年积日查日期」？How do I use the Find Date by Day of Year tool?
输入年份和年积日，用空格分隔（如 2024 60），下方即显示对应的日期。Enter the year and the day of the year separated by a space, such as 2024 60, to get the date.
要怎么输入？How do I enter the values?
输入年份和年积日，用空格或逗号分隔，例如 2024 60 得到 2024-02-29。多余的内容会报错。Type the year and the day of the year separated by a space or comma; for example 2024 60 gives 2024-02-29. Extra text gives an error.
年积日的范围是多少？What range can the day of year take?
平年 1–365，闰年 1–366；年份须为 0001–9999 的整数。1 to 365 in a common year and 1 to 366 in a leap year; the year must be a whole number from 0001 to 9999.
这个工具和时区有关吗？Do time zones affect this tool?
无关。结果只由输入的年份或日期按历法规则算出，不读取设备时钟，也不使用任何时区。No. The result is worked out from the year or date you enter with calendar rules alone; it never reads your device clock or uses a time zone.
输入和输出是什么样的？What does the input and output look like?
例如输入 2024 60，输出为：2024-02-29。The input 2024 60 becomes 2024-02-29.
「按年积日查日期」免费吗？需要注册吗？Is the Find Date by Day of Year tool free? Do I need an account?
「按年积日查日期」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 Find Date by Day of Year 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.