[Speed++]

In the server .cfg

PHP код:

logtimeformat [%H:%M:%S] 


What is it ?

from samp wiki

PHP код:

Allows you to configure the timestamp format. The format is based on the strftime format from C/C++. Here are some examples:
logtimeformat [%H:%M:%S] - (default) This displays only the time, and is the default format for all previous SA-MP server versions.
logtimeformat [%d/%m/%Y %H:%M:%S] - This would display the date in dd/mm/yyyy format followed by the time in hour:minute:second format. 


but is necessary, or can I remove it?

[Dolby]

this is donґt necessary,this is the 'format' of Hour's,Minute's and Second's printed on Server_log.

[coole210]

All server.cfg information can be found here on the wiki:

https://sampwiki.blast.hk/wiki/server.cfg