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I would like to change the starting date of the game from 1066 to 843 how can I do that. ?

Go to: Crusader Kings II/common/defines.txt and change the date
Code:
start_date = 1066.9.15
last_start_date = 1337.1.1
end_date = 1453.1.1

character = {
	16	#_CHDEF_AGE_OF_ADULTHOOD_ 
	45	#_CHDEF_MAX_CHILD_BIRTH_AGE_
	3	#_CHDEF_CHILD_BIRTH_TO_PREGNANCY_WAIT_ (months)
	2 	#_CHDEF_BASE_NR_OF_CHILDREN_PER_COUPLE_ ( The number of children allowed per couple )
	30	#_CHDEF_COURT_SIZE_CHILD_PENALTY_THRESHOLD_ ( When the total number of characters in a country is above this, one less child will be allowed per couple )
}

diplomacy = {
}

economy = {
}

military = {
}
 
There a mod thats doing just that (well, 844), by the way. Look for the Carolingian Mod thread.