Method: Convert intervals into seconds, perform addition/subtraction, then divide back: 3600 seconds per hour, 60 seconds per minute.
Working with time arithmetic can be tricky because time uses a sexagesimal (base-60) system for minutes and seconds, and a 24-hour cycle for days.
The Time Calculator simplifies this by allowing you to add or subtract time intervals, or calculate the exact duration between a start and end time.
Whether you are logging work hours, calculating flight durations, or summing up video clips, this tool converts components into a base second metric and outputs clean durations.
Designed for simplicity and speed, the outputs are formatted clearly into total hours, minutes, and days so you can record findings without conversion mistakes.
Example inputs and outputs using the calculator logic.
Quick links to similar calculators.
Answers to help you use the calculator correctly.
The system converts standard 12-hour clock times into a 24-hour format (e.g. 4:30 PM is 16:30) and calculates the elapsed time within the day.
Yes, if the end time is on the next day, it calculates the elapsed time by adding 24 hours to the boundary calculations.