format of message header for M2
<date format>%<time format>%<..>NICK<..>

<time format>	-	time format (see description bellow)
<date format>	-	date format (see description bellow)
<..>		-	nick separators
0		-	(Zero) Identifies empty section
%		-	format field separator
NICK		-	reserved word, indicate NICK record
special symbols:
%	for use % as symbol '%' -> %%
\n	new line

example of formatting:
0%0%[NICK] says:  - for MSN logging format
dddd',' dd MMMM yyyy%hh':'mm':'ss%[NICK]  - for IRC logging format

time format
-----------
default time string for setting
	"hh':'mm':'ss",
	"HH'-'mm'-'ss",
	"h'-'m",
	"h':'m",
	"H':'m':'s tt",
	"hh-mm-ss tt",

h	Hours with no leading zero for single-digit hours; 12-hour clock.
hh	Hours with leading zero for single-digit hours; 12-hour clock.
H	Hours with no leading zero for single-digit hours; 24-hour clock.
HH	Hours with leading zero for single-digit hours; 24-hour clock.
m	Minutes with no leading zero for single-digit minutes.
mm	Minutes with leading zero for single-digit minutes.
s	Seconds with no leading zero for single-digit seconds.
ss	Seconds with leading zero for single-digit seconds.
t	One character time-marker string, such as A or P.
tt	Multicharacter time-marker string, such as AM or PM.

date format
-----------
default date string for setting
	"[ddd',' MMM dd yyyy",
	"dddd'/'MM'/'dd'/'yy",
	"ddd'/'d'/'M'/'yyyy",
	"dddd',' dd MMMM yyyy",
	"dddd',' dd MMMM",
	"d MMMM",

d	Day of month as digits with no leading zero for single-digit days.
dd	Day of month as digits with leading zero for single-digit days.
ddd	Day of week as a three-letter abbreviation.
dddd	Day of week as its full name.
M	Month as digits with no leading zero for single-digit months.
MM	Month as digits with leading zero for single-digit months.
MMM	Month as a three-letter abbreviation.
MMMM	Month as its full name.
y	Year as last two digits, but with no leading zero for years less than 10.
yy	Year as last two digits, but with leading zero for years less than 10.
yyyy	Year represented by full four digits.
gg	Period/era string.