My page says this and Google shows something different
This is something that crops up a lot. Usually it's to do with the widgets that you have on your page being updated in realtime, but the Google search index doesn't get updated as often as you'd like.
To see when Google last indexed your page, get the page to appear in search results, then click on the little green down arrow by the URL, like here:
Then click on Cached like here:
Then at the top of the page you can see the date that Google indexed your page. If your page has formatting that stops the Google bar appearing at the top of the page, then you can always View > Source from your browser and look for the date in the source code. Here is the date showing for a page that Google has cached/indexed: