It would be helpful to add an optional variable (displayed only to users who are not logged in or do not have a local offset specified in their account preferences) via which the wiki's default time zone (such as UTC) could be specified.

In other words, such individuals would see "This page was last modified on 29 May at 5:30 (UTC).", while users with an offset of -6:00 would continue to see "This page was last modified on 28 May at 23:30." (just as they currently do).

Version: unspecified
Severity: enhancement