How to get details of changes in point in time recovery using mysqlbinlog

Question

I have written a shell script for point in time recovery using binary logs( Point-in-Time Recovery Using Event Times). I'm using the start time as the previous full-backup start time and end time will be to the current time.
I used the below command for point in time recovery.
mysqlbinlog -debug --start-datetime="$STARTTIME" --stop-datetime="$STOPTIME" $file > /tmp/test.sql $file consists of the list of log files created from start time to end time. But, in test.sql I see that the backup has happened from a different time to current time. Why is this happening. What should be done to get the .sql file from the particular start time. Here starttime was "2013-02-22 18:00:01"
How can I get exact details of changes from start time to end time.

Log File

/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#130222 17:30:01 server id 1  end_log_pos 107   Start: binlog v 4, server v 5.5.28-log created 130222 17:30:01
BINLOG '
wV0nUQ8BAAAAZwAAAGsAAAAAAAQANS41LjI4LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAVAAEGggAAAAICAgCAA==
'/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;