The tag allows you to tell search engines about the desired date for re-indexing a document in a search engine. Absolutely all search engines fix its meaning, but absolutely everyone does not particularly strive to fulfill the wishes of the unknown author of the page. For today it is completely useless - a much greater impact on the behavior of robots has a real frequency of updating the data on the site and its popularity. That is, dynamic pages of a popular site are "taped" by robots much more often than rarely edited single-player blogs, whatever figures are indicated with this meta.
< meta name = "revisit" content = "14" />