presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/storage/StorageManagerConfig.java/StorageManagerConfig/getShardDayBoundaryTimeZone
class StorageManagerConfig:    public DateTimeZone getShardDayBoundaryTimeZone()
    {
        return DateTimeZone.forTimeZone(TimeZone.getTimeZone(shardDayBoundaryTimeZone));
    }