Can I work with negative time spans?
Yes. Subtracting a larger span from a smaller one produces a negative result that is clearly labeled with a minus sign.
Step-by-step walkthrough
Time Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- time
- hours
- minutes
Detailed procedure
Step 1
Pick whether you want to add or subtract the second time span.
Step 2
Enter Time A and Time B using HH:MM formatting.
Step 3
Read the combined result and total minutes in the results block.
Teaching & troubleshooting tips
Does the calculator handle hours over 24?
Absolutely. Inputs are treated as durations, so 30:00 represents 30 hours without wrapping to the next day.