Calculate Time of a shutted down app

hi,
i'd like to make a script that increase a value every second, that can be done with something like that:

Code (CSharp):

1. public ValueToIncrease;
2. public ValuePerSecond;
3.  
4. Void start() {
5.      InvokeRepeating ("IncreasePerSecond", 0f, 1f);
6. }
7.  
8. void IncreasePerSecond(){
9. ValueToIncrease =ValueToIncrease + ValuePerSecond;
10. }

the problem is that this script works only if the application is running;
i'm going to make an adnroid application and i need that this script runs in backgrond.

or

a script that takes the ClockTime when the app is turned off and the ClockTime when the app is turend on,
makes the difference and than multiply the Time in seconds with the ValuePerSecond.
but i don't know how to get the ClockTime and theorically it could be exploited by changing the phone time.

any help?

thanks in advance

 

This is what you have to do; if any app could update once a second while out of focus, phone batteries would only last a few hours.

System.DateTime.Now

You'll probably just have to live with that. The only way (I know of) to get around that is by having a server that you can request the time from, and that would make things a lot more complicated for you (and may cost you time/money to maintain the server).

 

thanks a lot.
i need to have something like unix clock (n Seconds) and not something like the Normal Clock (DD/MM/YYYY HH:MM:SS). how i can get this?
thanks

 

up

 

System.DateTime.Now returns a DateTime object. This object supports the - operator, so you can simply serialize the System.DateTime.Now before your app shuts down, deserialize when it starts up, get the current System.DateTime.Now DateTime object and subtract the two. This will leave you with a TimeSpan object which can be converted to millisends, seconds, minutes, etc.. by accessing the corresponding property.

 

Thanks