你只要输入4位数的出生年份，然后在下拉框中选择自己的出生月份和日期，再按“计算”按钮，本系统就可以精确计算出你的年龄、月龄、周龄直至时分秒，还能提示距你下一个生日的时间，并且是倒计时，very cool　！-Just enter your 4-digit year of birth, and then in the drop-down box, select the month and day of his birth, and then press the "Calculate" button, the system can accurately calculate your age, months, weeks until the minutes and seconds, can prompt your next birthday at the time, and is the countdown!