Mysql Server processlist shows negative value(-) in connect column for system user

Some times process list out put show negative value like bellow :
Command :

watch /usr/local/mysql/bin/mysqladmin -ppass processlist

8 | system user | | Connect | -1247 | Has read all relay log; waiting for the slave I/O thread to update it |

One of the reason :
make sure both Server has same time zone.
if there is any time difference between 2 server the replicate client show negative values

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