This blog post contains information about the fields in the Lifetime section of the standard template in the Sitecore ASP.NET web Content Management System (CMS) and Experience Platform (XP). For more information about the standard template and topics mentioned in this blog post, see the links in the Resources section at the end of this page.
The Lifetime section of the standard template contains fields for managing publishing restrictions at the version level. Sitecore manages item-level publishing restrictions in fields within the Publishing section of the standard template.
OK, I give up on noting variance on alphabetic order of standard template fields.
What is the difference between the "_Valid To" and "_Valid From" fields? It appears here as if they both have the same definition.
_Valid from: Date from which this item is publishable. Whenever we create any new version of an item then it is by default set to creation date of that version.