Calculate your age or the time between any two dates
Different conventions: Age can be calculated differently based on cultural systems.
Month variations: The calculation accounts for varying lengths of months.
Leap years: The calculator automatically adjusts for leap years in its calculations.
Time precision: Results include hours, minutes, and seconds for precise measurements.
Age calculation may seem straightforward, but various cultures and contexts use different systems to determine age. This calculator uses the most common Western method, where age increases on each birthday anniversary.
Our age calculator uses a precise algorithm that accounts for varying month lengths, leap years, and exact time differences. It follows these steps:
When calculating age from birth date to current date, the calculator determines your exact age in years, months, and days according to the Western system of age reckoning.
When calculating from the last day of a month to the same day of another month, special rules apply. For example, from February 28 to March 28 is one month, but from February 28 to March 31 could be considered one month and three days or simply one month depending on the calculation method.
Leap years add complexity to age calculations. This calculator properly accounts for leap years, including the special case of people born on February 29 (who technically only have a birthday every four years).
Determine eligibility for legal rights, such as voting, driving, or purchasing age-restricted products. Legal systems typically use completed years of age.
Precise age calculations are important for medical dosages, developmental milestones, and health recommendations which often require exact age including months and days.
Calculate time until important events, retirement planning, or simply tracking anniversaries and milestones in your life.
While basic age calculation seems simple, precise age calculation involves careful consideration of calendar rules.
For exact year, month, and day calculations, the formula must account for:
For total days calculation, we simply find the difference in timestamps and convert to days:
This gives the exact number of days between two dates, which can then be converted to weeks, months, or years as needed.