Time elapsed

[RhysD]

Does anyone know a good method for calculating the time between when an app was last closed and opened? I've looked at the Time & Date object but I'm unsure how to calculate the time between two dates. Is there a function in MMF for this?

[RhysD]

Any ideas? I've thought of keeping track of time while the app is open, then saving this value and somehow comparing to something when they open the app again...but it's driving me nuts.

[JimJam]

Yeah, I actually just implemented this in my application just the other day. I'll see if I can extract the code for you.

EDIT:
Here you go. How to track how many seconds/minutes/hours/days/months since the last time an action has occurred.

[RhysD]

Thanks for the example! But I don't think the Calendar object is supported in iOS

[JimJam]

Oops. Sorry. You said Time & Date, I thought it was the same object.

Hmm... Sorry, I can't really think of an alternative. If you can find some way of turning the date into a pure integer, comparing them would be easy. Otherwise, you'd have to break apart the string and turn each part into an integer.

Time & Date doesn't seem to allow you to retrieve the internal system clock in seconds... I can't really find an easy way.

One method is to convert the current date into a Julian Day. http://en.wikipedia.org/wiki/Julian_day

Its a cumbersome equation, and requires at least 4 variables... but I think its your only choice. It will give the day as an integer (which you can then compare)

[iamjot]

Hmm will there be a calender object support for ios one day? Could be interesting for a lot of apps i think.