Is there a way to get notification of date change in c#?

Question

Is there a way to get notification of date change in c#?

I have a requirement where I have to do something when the system date is changed.

I found that SystemsEvent.TimeChanged is an event you can hook into, however it is only fired only when user has changed the time.

Answer 1

Would this be better handled by having a scheduled task/cron job that runs at midnight?

Answer 2

You could implement this (admittedly poorly) as follows:

Write a very lightweight class which simply stores the current date. Start it in a separate thread and make it periodically check the date, then sleep for a large amount of time (in fact, you could make it sleep for just longer than the time left until midnight). If the date has changed, make it call a callback function in the main part of your app.

Like I said, this doesn't seem like a brilliant solution to your problem and there are probably much better ways of doing it.

Answer 3

You might be looking for System.Threading.Timer. It will fire at an interval you set.

Answer 4

The system broadcasts a WM_TIMECHANGE message when the user changes the system date/time. The correct way to handle this is to handle that message. I suspect the .net event SystemEvents.TimeChanged is just a wrapper around this.