Add multiple date sensitive pricings to an event

Okay I am setting a martial arts seminar with 1 overall price and 1 price for one day and the price for both the 2 day and 1 day tickets need to change based on the Date. eg 2 day full seminar $160 1 day only $100 before May 25th. After May 25th but before June 20th 2 days is 240 1 day is 200 and after June 20th 2 days is 360 1 day is 300. Help me please