[support] Knowing when a field was last updated

Hello!

I am trying to figure this out, but haven't found an answer yet, so hope you can help me: I am building this content type which will be updated every month with new information.

I created several text fields with infinite values, so each month, the author will edit the content, add a text box on the fields that need to be updated, and save again. The content type will have a history of the updates.

My question is - does the fields get associate with the time when they were saved? For example, if I want to collect only the entries on that field that were entered during a certain period of time, is this possible?

If not - does anyone have another suggestion of how to do this?

Thank you,

Dan