I write about various film actors in newspapres and for this I usually and frequently need the birthday and deathday annivesary dates of different film personalites from hollywood and bollywood.I shall be helpful if someone helps me know about important dates I mean birth and death dates of greatest hollywood and great bollywood (indian) film personalities.

Try IMdB (http://www.imdb.com/search/title) or Wiki (http://en.wikipedia.org/wiki/Main_Page) for starters.
Simple search their names..