Update index date

[fabrico23]

If I update the content of a page without changing the initial url and google crawls my new page, will the index date (that appears in the SERP) change to the latest update?

In positive case how many change should I do to consider an update?

tks

[StreamlineMetrics]

I'm not exactly sure what you are asking, but I will try to answer. Google is constantly crawling and updating the pages in their index and SERPs. You can make as many or as few changes to your webpage and Google will eventually crawl the page and update the SERPs with your updated page. An easy way to test to see if Google has updated your page is to search Google with the query "site:www.yoursite.com" and you will see all the pages from your website that Google has in its index. If the Google result for a particular page is not showing up with your changes, hang in there, it just means Google has not crawled that page yet but will do so eventually. You can also check the Google cache of a particular page to see the last time Google accessed it and see the content of the page that Google currently has in its index.