Date & Time Difference
Find the exact difference between two dates — as a calendar-aware breakdown of years, months and days (accounting for different month lengths and leap years, not a flat 30-day assumption), plus the total expressed in days, hours, minutes and seconds. Tick "include time of day" for a more precise result down to the minute.
About date & time difference
This calculator finds the calendar-aware difference between two dates — years, months and days, accounting for different month lengths and leap years — plus the total expressed in days, hours, minutes and seconds.
"How many years, months and days" between two dates isn't just simple subtraction — months have different lengths and leap years add a day, so a naive calculation drifts. This tool does the calendar-correct version: enter a "from" and "to" date (optionally with a time of day for more precision) and get both the calendar breakdown and the raw total in days, hours, minutes and seconds.
When to use it
- Working out someone's exact age, or the age of an anniversary or milestone.
- Calculating a contract, warranty or notice period in years/months/days.
- Checking how long ago (or how far away) a specific date is.
- Getting a precise day-count for a project, pregnancy, or countdown.
How to use it
- Enter a "from" date and a "to" date.
- Tick "Include time of day" for a more precise, minute-level result.
- Read the years/months/days breakdown, plus the raw totals below it.
Tips
- Leave "Include time of day" unticked for a pure whole-day count between two dates.
- The calendar breakdown (years/months/days) and the total-days figure can both be useful — pick whichever your use case needs.
FAQ
How is the years/months/days breakdown calculated?
It uses calendar-aware arithmetic — accounting for different month lengths and leap years — rather than assuming a fixed 30-day month, so the breakdown matches how a calendar actually works.
Can I include a specific time, not just the date?
Yes — tick "Include time of day" to add hours and minutes to both dates for a more precise difference.