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But this province (Sunda)represent the kigdom of Bantem, that wasn't conquered until 1805...

The AI needs to have the claimcores before the historical conquest, and better years before, to guide it in actually declaring and waging a war and then conquering the province.

The Netherlands and Bantem were involved in several armed conflicts and giving a claimcore to the Netherlands in the 1670´s is fitting IMO.
http://en.wikipedia.org/wiki/Banten_Sultanate#Decline

In case the dutch has already conquered the province the event should be :

Code:
#(1745) Van Imhoff founds Buitenzorg
event = {
	id = 186428
	trigger = {
		owned = { province = 701 data = -1 } #Sunda
	}
	random = no
	country = HOL
	name = "EVENTNAME186428" #Van Imhoff founds Buitenzorg
	desc = "EVENTHIST186428"
	#-#In 1745 Gov-Gen Van Imhoff founded Buitenzorg (today's Bogor).

	date = { day = 0 month = january year = 1745 }
	offset = 30
	[COLOR="#FFFF00"]deathdate = { day = 29 month = december year = 1820}[/COLOR] To the end date..

Instead of day month year you can simply use year = 1820 as enddate if an event should be able to trigger until the end of the game.