I have a clock function to set and display current UK time. It's updated every second from a pretty standard piece of Date Object voodoo driven by setInterval(myClock, 1000);

Using XCode's 'Instruments' to check leaks we appear to be chewing though 2.57MB of memory in a run of two hours.

If I disable the clock loop the leak goes away. So my question is

1) If I am overwriting the same global variable in the clock function every second (which is used to expose the adjusted Date Object to the rest of the app) where is the leak coming from?

2) Should I worry about this or does Mr Garbage man come round and clean up later?