How to use this tool
Enter a starting date, choose an end date or use today, and select Age or Date Difference. See complete elapsed years, months, remaining days and total calendar days.
Quick steps
- Choose Age or Date Difference and enter the starting date.
- Choose the end date or use today's date.
- Read the elapsed years, months, days and total calendar-day difference.
Practical tip
Dates are compared as calendar days, not local timestamps, so daylight-saving clock shifts do not change the result. February 29 birthdays use February 28 for anniversaries in non-leap years.
Common questions
How do you handle leap years?
The calculation counts real days; February 29 anniversaries are treated as February 28 in non-leap years.
Does daylight saving affect the results?
No. Both dates are compared at UTC calendar-day boundaries, without local daylight saving offsets.
Can I compare future dates?
Yes, using the Date Difference mode. Age mode requires the birth date to be on or before the selected date.