Question 1

How do I add hours to a time?

Accepted Answer

Open the Add/Subtract tab, enter a starting time (e.g. 09:30), enter the hours, minutes and seconds you want to add, then click Calculate. The result will show the new time and the day it lands on.

Question 2

Can I compute the duration between two times?

Accepted Answer

Yes. Open the Duration tab, enter a start and end time (with optional date), then click Calculate. The tool shows the elapsed time in hours, minutes, seconds and also in larger units like days, weeks, months and years.

Question 3

How accurate is the time conversion?

Accepted Answer

All conversions use exact second-level math. 1 hour equals 3600 seconds, 1 day equals 86400 seconds, 1 week equals 604800 seconds, and so on. Leap years and 30/31-day months are handled by standard date math.

Question 4

Does it work in 24-hour and 12-hour format?

Accepted Answer

Yes. Time inputs are in 24-hour HH:MM format, but the result can be displayed in either 12-hour (AM/PM) or 24-hour format using the format toggle above the inputs.