I got a negative time for completing my Radiography simulation!!

In the radiography projection report area, my time shows a negative. How is this possible?

When clocks move forward (daylight saving time), you can see a negative duration if the session spans the change. When clocks move back, the reverse can happen, and the system may show an unusually long positive duration because the same hour is counted twice. Both issues only occur if someone is actively using the system at the moment the clock shifts or if they are travelling across time zones mid-session.