This time duration calculator quickly finds the difference between two times or adds and subtracts hours and minutes from a given time. It is useful for calculating work shifts, travel time, study sessions, workouts, and daily schedules.
- Simple mode: Enter a start and end time to calculate the exact duration, even if it crosses midnight.
- Advanced mode: Add or subtract hours and minutes from any given time to see the result instantly.
- Flexible formats: Works with 12-hour or 24-hour time inputs.
- Detailed output: Duration displayed in hours, minutes, and seconds.
- Practical uses: Great for work schedules, event planning, commuting, or calculating time left in exams.
How to use: Choose Simple mode to enter start and end times for duration. Use Advanced mode to adjust any base time by adding or subtracting hours and minutes. The result updates instantly with a clear time summary.
Common searches: time difference calculator, add hours to time calculator, subtract time online, work shift calculator, travel duration calculator.
Time Duration Calculator
Find the difference between two times, or add and subtract hours and minutes from a given time.
How the time duration calculator works
The time duration calculator measures the total elapsed time between two time points or adjusts a base time by adding or subtracting hours and minutes. It converts results into hours, minutes, and seconds for easy understanding.
Calculating time difference
To calculate the difference between two times, the calculator subtracts the start time from the end time. If the end time is earlier than the start time, the tool automatically accounts for crossing midnight.
- Example 1: Start 9:15 AM, End 5:45 PM → Duration = 8 hours 30 minutes.
- Example 2: Start 10:30 PM, End 2:15 AM → Duration = 3 hours 45 minutes (cross-midnight).
Adding or subtracting time
In advanced mode, you can add or subtract time from any base time. This is useful for planning schedules, transport arrivals, exam timing, and workouts.
- Example 1: Base time 8:15 AM + 2 hours 45 minutes → 11:00 AM.
- Example 2: Base time 6:30 PM − 1 hour 20 minutes → 5:10 PM.
Common use cases of the calculator
Time duration calculators are widely used in everyday life, from school exams to office work shifts. Below are some common scenarios and how the calculator helps:
| Scenario | Start / Base Time | End / Adjustment | Result |
|---|---|---|---|
| Work shift | 9:00 AM | 5:30 PM | 8 hours 30 minutes |
| Overnight travel | 11:15 PM | 6:00 AM | 6 hours 45 minutes |
| Exam duration | 2:00 PM | 4:30 PM | 2 hours 30 minutes |
| Add time | 7:20 AM | + 1 hour 40 minutes | 9:00 AM |
| Subtract time | 8:00 PM | − 50 minutes | 7:10 PM |
Time Duration Calculator FAQs
To calculate duration, subtract the start time from the end time. If the end time is earlier than the start time, the calculation adds 24 hours to handle overnight or cross-midnight situations. For example, from 10:30 PM to 2:15 AM is 3 hours 45 minutes.
Yes. The time duration calculator automatically accounts for times that cross midnight. It extends the end time into the next day and gives the correct difference in hours, minutes, and seconds.
Use the advanced mode to add hours and minutes to any base time. For example, adding 2 hours 30 minutes to 8:15 AM gives 10:45 AM. The same feature can also subtract time.
The calculator displays results in hours, minutes, and seconds. It can also be used to express time differences in total minutes or total seconds by interpreting the result.
Common uses include calculating work shifts, school or exam timings, workout sessions, travel time, and scheduling events. It saves time by avoiding manual time math.
Yes. The calculator works with both 12-hour format (AM/PM) and 24-hour format. Results remain accurate regardless of input style.