Date & Time Difference Calculator
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 works out how many days between two dates — plus the calendar-aware breakdown in years, months and days, accounting for different month lengths and leap years — as well as the total in hours, minutes and seconds.
Months differ in length and leap years add a day, so simple subtraction drifts. Enter a "from" and "to" date (optionally with a time of day) to get the years/months/days breakdown and the total days, hours, minutes and seconds.
What each answer is for
| Answer type | Example | Use it for |
|---|---|---|
| Total days | 168 days | Countdowns, notice periods |
| Years/months/days | 5 months 16 days | Ages, anniversaries |
| Total hours | 4,032 hours | Billing, long spans |
| With time of day | 5m 16d 4h 30m | Precise deadlines |
When to use it
- Finding out how many days between two dates, for a deadline, trip or event.
- 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.
- 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.
- Use years/months/days for ages and anniversaries, total days for countdowns.
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.
How many days between two dates, exactly?
Enter both dates above and the total-days figure appears alongside the years/months/days breakdown. The count is inclusive of every calendar day that passes between them, with leap days handled automatically.
Does it count business days or all days?
All calendar days, including weekends and holidays. Subtract weekends yourself for working days — most notice periods use calendar days anyway.
Why not just subtract the dates myself?
Months differ in length and leap years add a day, so manual subtraction drifts across months. Walking the real calendar avoids that.
Can I measure a date in the past?
Yes — it works in both directions, so you can measure how long ago something happened just as easily as how far away a future date is.