⏱️ Time Duration Calculator
Use our free Time Duration Calculator to calculate the duration between two times, add or subtract time from a given time, and get detailed breakdowns in various units.
CALCULATE DURATION BETWEEN TWO TIMES
Start Time
Hours
Minutes
Seconds
End Time
Hours
Minutes
Seconds
→
ADD OR SUBTRACT TIME FROM A GIVEN TIME
Base Time
Hours
Minutes
Seconds
Time to Add/Subtract
Hours
Minutes
Seconds
How to Use the Time Duration Calculator
1
Choose your mode — Time Difference to find the gap between two times, or Add/Subtract Time to offset a given time
2
Time Difference: Enter the start time and end time (hours, minutes, seconds), then select AM or PM for each
3
For multi-day calculations, optionally enter a start date and end date to account for overnight or cross-day durations
4
Add/Subtract: Enter your base time, choose Add Time or Subtract Time, then enter the hours, minutes, and seconds to offset
5
Click Calculate Duration — results show the total duration in HH:MM:SS, minutes, hours, and a full day/hour/minute/second breakdown
Two Modes, Every Time Use Case
Time Difference
Find the exact duration between any two times — within the same day or across multiple days when dates are provided. Results display in seconds, minutes, hours, and a full breakdown.
9:00 AM → 5:30 PM = 8h 30m
11:45 PM → 6:15 AM = 6h 30m
Add / Subtract Time
Start from any time and add or subtract a duration to get a new time. Automatically wraps around midnight so you always get the correct result, shown in both 12-hour and 24-hour format.
9:00 AM + 1h 45m = 10:45 AM
2:00 AM − 3h = 11:00 PM