[RedCounty]

It's simple, look into the following:

gettime
getdate

and

format

Here is an example;

pawn Код:

stock NewDate()
{
    new Year, Month, Day, string[30];
    getdate(Year, Month, Day);
    format(string, sizeof(string), "%02d/%02d/%d", Day, Month, Year);
    return string;
}

and:

pawn Код:

stock NewTime()
{
    new Hour, Minute, Second, string[30];
    gettime(Hour, Minute, Second);
    format(string, sizeof(string), "%02d:%02d:%02d", Hour, Minute, Second);
    return string;
}

Then use this:

format(string, sizeof(string), "[%s - %s] ...", NewDate(), NewTime());
SendClientMessage(playerid, -1, string);

^^ - would print as:

[15/01/2015 - 18:27] ...