Time and Date Calculator
Calculate the exact time duration between two dates including hours, minutes, and seconds. Find the precise difference between any two date-time points. See also Date Calculator and Time Calculator.
Start Date & Time
End Date & Time
How to Calculate Time Between Two Dates
- Select the start date from the calendar picker.
- Enter the start time in hours, minutes, and seconds (24-hour format).
- Select the end date from the calendar picker.
- Enter the end time in hours, minutes, and seconds.
- Click Calculate to see the exact duration between the two date-time points.
Formula
Duration = End DateTime - Start DateTime
Breakdown:
Total Seconds = (End - Start) / 1000
Total Minutes = Total Seconds / 60
Total Hours = Total Minutes / 60
Total Days = Total Hours / 24
Exact breakdown accounts for:
- Varying month lengths (28-31 days)
- Leap years (366 days)
- Hour/minute/second carry-overExample
Start: January 15, 2024 at 09:30:00
End: March 20, 2024 at 14:45:30
Result: 2 months, 5 days, 5 hours, 15 minutes, 30 seconds
Total: 65 days, 1,565 hours, 93,915 minutes, 5,634,930 seconds
Time Duration Reference Table
| Duration | Days | Hours | Minutes | Seconds |
|---|---|---|---|---|
| 1 Hour | 0.0417 | 1 | 60 | 3,600 |
| 1 Day | 1 | 24 | 1,440 | 86,400 |
| 1 Week | 7 | 168 | 10,080 | 604,800 |
| 1 Month (avg) | 30.44 | 730.5 | 43,830 | 2,629,800 |
| 1 Quarter | 91.31 | 2,191.5 | 131,490 | 7,889,400 |
| 6 Months | 182.62 | 4,383 | 262,980 | 15,778,800 |
| 1 Year | 365.25 | 8,766 | 525,960 | 31,557,600 |
| 5 Years | 1,826.25 | 43,830 | 2,629,800 | 157,788,000 |
| 10 Years | 3,652.5 | 87,660 | 5,259,600 | 315,576,000 |
Frequently Asked Questions
How does the time and date calculator work?
It calculates the exact duration between two date-time points by computing the difference in years, months, days, hours, minutes, and seconds. It accounts for varying month lengths and leap years.
Does it account for leap years?
Yes. The calculator uses actual calendar dates, so February 29 in leap years is properly handled when computing the duration between dates.
What time format does it use?
The calculator uses 24-hour format (0-23 for hours, 0-59 for minutes and seconds). For example, 2:30 PM is entered as hour 14, minute 30.
Can I calculate business days between dates?
This calculator counts all calendar days including weekends. For business days only, use our Working Days Calculator.
What is the difference between this and the date calculator?
The Date Calculator works with dates only (no time). This tool includes hours, minutes, and seconds for precise time duration measurement.