I have a website with sauna reviews. These are mostly pages that exist for years and regularly change because comments/reviews are added by visitors and/or because I change information on the page. When searching in Google for competitive keywords I noticed that the snippet of my direct competitor included a date stamp in the format (9 hous ago). How can I include a time stamp in the snippet, and more important how can I make sure that the timestamp is very recent. Is it sufficient to add a date on the page every time the page is updated or is ther emore to it?