24-Hour Time Calculator
Richard Montoya
About this app
- Age 10
- Updated Jul 23, 2025
- OS IOS
Editor reviews
24-Hour Time Calculator is a fast, accurate utility for converting and calculating time in 24-hour and 12-hour formats. Instantly convert 14:35 to 2:35 PM, add or subtract hours and minutes, and find exact durations between two timestamps. Built for productivity with a clean interface and instant results.
Core features:
- Format conversion: two-way 24-hour and 12-hour with AM/PM toggle
- Time math: add and subtract durations, sum multiple times with real-time validation
- Duration calculator: compute differences between start and end times, including cross-date spans
Ideal for shift workers, students, developers, and project managers planning schedules or verifying timestamps. Keywords: time calculator, 24-hour time converter, duration calculator, productivity, utilities, schedule planning.
Screenshots
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How to use:
1. Download and open the app; no sign-up required.
2. Choose a mode: Convert, Add/Subtract, or Duration.
3. Enter time values in 24-hour or 12-hour format and toggle AM/PM as needed to see instant results.
4. For Add/Subtract, input a base time and a duration, then tap Add or Subtract; for Duration, set Start and End times and dates.
5. Copy the result or save it as a preset to reuse in future calculations.