如何在C＃中检查时间是否手动更改

Question

I am writing a program that does something on computer periodically based on current time. But user may change windows time manually and make my program confounded. My idea was saving current time in every loop iteration and comparing it with last saved time. So I could determine time changing and the amount of change. But it makes mistakes. System Hibernate (and Sleep) does same thing so I can't make difference between "manually time changing" and "System Hibernate". In fact Now the problem can be solved with determining Hibernate (and Sleep). Can you please help me (In determining Hibernate (and Sleep) or determining time changing)?

Answer 1

You could use a Stopwatch to measure elapsed time. The stopwatch does not depend on the system clock and is therefore not affected by changes to it.

Hibernation, sleep etc. can be detected with the SystemEvents.PowerModeChanged event.

Answer 2

Use time web services to check the time on application startup. Or you can create Windows service that will check for time change even if your program isn't launched.