Can I get a notification if clock changed/adjusted?

I have a program which relies on the clock-time to do some recurring tasks. How can I tell that clock was changed and I need to re开发者_如何学编程-adjust my tasks?

EDIT: I am using a Date instance to see if time already passed or not.

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Start a new thread which:

1. Fetches the current clock time and stores it in a variable V
2. Sleeps for X milliseconds
3. Adds X to V, compares it to the current clock time
4. If the values don't match to within a few milliseconds, assume the clock has changed, and trigger a reschedule
5. Rinse and repeat