Urr, that's not a chat log. That's an event log... Event logs are records of all your contacts' activities. When they signed in, when they changed their status, etc...
Do the following to alter the Event Log timestamp:
1) Go to your start menu.
2) Click on Run.
-- Or press the Windows Key and R simultaneously --
3) Type "regedit" (without quotation marks) and press enter.
4) Navigate to the following key:
code:
HKCU\Software\Patchou\MsgPlus2\your@email.com\Preferences
Click on:
SystemLogTimeStampFmt
and change it to your liking.
For more information about the tags you can use to change the timestamp,
click here.
However, it's easier to use Plus! Tweak,
click here for more information.
Run it and then find SystemLogTimeStampFmt
Then go and
click here to see what tags you can use.