Use Rails timezones support
This switches off previous time offset calculation when showing time values to user, relying on Rails timezones support instead.
This is essential for cases when time is entered by user, so we need this for our #1650 patch (otherwise user sees his time +his timezone offset).
This doesn't bring much to current Redmine as all the time fields are populated automatically currently. May be it could be used to correct SCM timestamps if some give it in non-UTC. And surely this will help time values in custom fields when they support it.
After this patch is applied all the datetimes in the database will be interpreted as being in UTC, so if they don't they need to be updated. For this new redmine:convert_database_times_to_utc rake task is included. Be sure to correct its LOCAL_UTC_OFFSET and back up the database prior to running.
Contributed by Texuna Technologies.
Updated by Artem Vasiliev over 15 years ago
http://mad.ly/2008/04/09/rails-21-time-zone-support-an-overview/ has good introduction to (and discussion of) Rails 2.1 timezones support.