输入生日，立刻得到精确年龄（几岁几个月几天）、一共活了多少天，以及下个生日还有多久；下面还能算任意两个日期相差多少天，算工龄、算纪念日、算项目工期都好用。Enter a birth date to get an exact age (years, months, days), total days lived, and a countdown to the next birthday. Below, calculate the days between any two dates — handy for anniversaries, tenures and deadlines.
闰年、每月天数都按真实日历计算，2 月 29 日出生的人在平年按下个生日的算法与主流工具一致。所有计算在本地完成，出生日期不会被上传或记录。Leap years and month lengths follow the real calendar. Everything is computed locally — your birth date is never uploaded or stored.