MediaWiki:Paramvalidator-help-type-expiry
Type: .
May be relative (e.g. 5 months or 2 weeks) or absolute (e.g. 2014-09-18T12:34:56Z). For no expiry, use $2.
Type: .
May be relative (e.g. 5 months or 2 weeks) or absolute (e.g. 2014-09-18T12:34:56Z). For no expiry, use $2.