Getting the time of a particular keyframe

Hi There,

I took a look at the Scripting Guide, but after a cursory search + read couldn't find the answer to my question there, so I thought I would reach out here.  How can I get the time value for a keyframe in any given property?  I know I can iterate through keys using the .numKeys value, but what is the code to use in order to  retrieve the time of the key while iterating.

Here's some pseudo code for how I'm thinking about it:

numPosKeys = lyr.transform.position.numKeys;

for (var i=1; i <= numPosKeys; i++)

{

     timeOfKey = {//not sure how to do this, or if it is possible};

     //do something with timeOfKey

}

Thanks for your time and help!

--Arie