They say the only stupid question is the one that isn't asked. So here it goes.
If I have a page that I'm trying to rank up in google does it help to have a time and date on it so it changes every day and google indexes it every day?
I'm not saying adding new content. I'm just saying changing existing content by having the date listed in the post. Hence it would change every day.
I have competitor that is doing this and they are ranked #1 and google seems to index them every day.
Will making edits to the content for better keyword placement help once a page has been crawled and indexed?
You should be placing your KWs in the best possible places before publishing your content. If you write your content correctly before hand, there's no need to go back and change your wording around.