change timezone to Pacific
change timezone to Beijing, week start at sunday
change week time range to count sunday -- monday's date
config.active_record.default_timezone = 'Beijing'
use to_formatted_s method test
remove     # config.active_record.default_timezone = 'Beijing'
add     config.active_record.default_timezone = :local
Beijing  :local
require login in every page
fix heroku merge
admin can add new mac
admin can edit Mac
change nav color
fix post issues