nikhilnaik on "2 Dates on Article. Which will be followed by Google?"

Hello,

I recently changed the way date is being displayed on my blog article.

Here is one the post link to get a clear idea - http://www.bloggercent.com/402/focus-on-social-media-engagement-to-reap-benefit.html

I put it up this format - Posted on "DATE" [Last modified on "DATE"]

Now my question is, When google indexes this article again, which date will be displayed in the search results? The modified one or the original one? I want the modified date to be displayed.

Also I haven't put up the "modified date" on the index and the category pages [only the published date]. Will this be a problem?