Age calculator
Find calendar age and days until the next birthday.
Formula
Subtract completed calendar years, then months, then remaining days.
Birth date = 2000-01-01 · Age on date = 2026-10-12
How to use
- Enter birth date.
- Choose the comparison date.
- Read completed years, months and days.
Examples
- 2000-01-01 to 2026-01-01: 26 years.
Frequently asked questions
Is the end date included?
Total days is elapsed time; equal dates give zero.
How are leap birthdays handled?
February 29 is treated as February 28 in non-leap years.
Does time zone matter?
Dates use calendar arithmetic, without birth times or time zones.
Sources
Updated: