Calculate calendar age in years, months, and days, along with total elapsed calendar days and hours, from a birth date. February 29 birthdays use March 1 in non-leap years.
Methodology and approach
The calculator subtracts the birth date from the current date, carrying over months and days for accurate age calculation.
Enter dates in the format shown by this tool. Date-only calculations use calendar dates; date-time fields use local time unless a timezone selector is provided. Timestamp outputs identify their units.
Common questions about this tool
