ActionView::InstanceTag#default_time_from_options with hash args uses Time.current as default; respects hash settings when time falls in system local spring DST gap
Adding Date.current, which returns Time.zone.today if config.time_zone is set; otherwise returns Date.today. ActionView date_helper uses Date.current to determine locale-appropriate default
Time.zone.parse: compatibility with far future date with time zone offset in string. Eliminate creation of additional TimeWithZone instance to determine utc offset.