Configure the default timezone
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Navigate to the Redmine installation directory: $ cd /opt/bitnami/redmine
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Check all the available timezones by executing these commands: $ bundle exec rake time:zones:all
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Once you decide on the correct one, edit the config/application.rb file and substitute the line config.active_record.default_timezone = :localwith config.active_record.default_timezone = 'your_timezone'Note that the single quotes around the timezone value are necessary. 
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Restart services. $ sudo /opt/bitnami/ctlscript.sh restart apache