🎂 半岁生日计算器Half Birthday Calculator

使用说明与常见问题How-to & FAQ

「半岁生日计算器」是什么？What is the Half Birthday Calculator tool?

根据出生日期算出半岁生日（生日加 6 个月）是哪一天、下一个半岁生日的日期、还有多少天，以及届时是几岁半；8 月 31 日这类日期会落到 2 月最后一天。Find your half birthday (birthday plus 6 months), the date of the next one, how many days away it is and the age you will be — dates like August 31 fall on the last day of February.

如何使用「半岁生日计算器」？How do I use the Half Birthday Calculator tool?

在「半岁生日计算器」中，填写「出生日期」、「参考日期（空白 = 今天）」等参数，结果会随输入实时计算并显示在下方。In the Half Birthday Calculator: Fill in "Date of birth", "Reference date (blank = today)"; results are recalculated instantly as you type.

半岁生日怎么算？How is a half birthday worked out?

在生日的月份上加 6 个月、日期不变：4 月 15 日出生，半岁生日是 10 月 15 日。如果那个月没有这一天（如 8 月 29–31 日出生），就取那个月的最后一天，即 2 月 28 日或闰年的 2 月 29 日。Add 6 months to the birthday and keep the day: born April 15, the half birthday is October 15. If that month has no such day (born August 29–31), the last day of the month is used — February 28, or February 29 in a leap year.

为什么不是正好 182.5 天？Why not exactly 182.5 days?

按天数平分一年会因为月份长短和闰年而落在不同日期，所以通常按「加 6 个月」的日历方法计算，本工具也这样做。Splitting the year by days lands on different dates depending on month lengths and leap years, so the usual method — used here — is to add 6 calendar months.

时区如何处理？How are time zones handled?

「半岁生日计算器」按日历日期计算，只有“今天”取自你设备的本地日期；计算不涉及钟点，所以时区和夏令时不影响结果。The Half Birthday Calculator works with calendar dates; only "today" comes from your device's local date. No clock times are involved, so time zones and daylight saving time do not affect the result.

「半岁生日计算器」免费吗？需要注册吗？Is the Half Birthday Calculator free? Do I need an account?

「半岁生日计算器」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 Half Birthday 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.