How to display full time in the winbox log

For me it looks correctly. It may be that you have increased your system fonts.

You could send all your log to a Syslog server like Splunk. Then you could see all information and also graph it,
http://forum.mikrotik.com/t/tool-using-splunk-to-analyse-mikrotik-logs-3-3-graphing-everything/121810/1