Enter the month, date, and year (four digits) and it calculates everything about your birthdate ... how old you are in years, weeks, months, days, hours, minutes, seconds, and how long until your next birthday. And not that it's terribly important but for absolute accuracy (when it comes to hours, minutes, seconds), you'll have to account for the time of the day you were born. And where will we find that? On your birth certificate, of course. So click here to move the calculator into full view.