Lent & St. Joseph's Day


As you know Lent began yesterday. It is my understanding that it is a forty day journey. Easter arrives this year on 4-16-17 / more than forty days from yesterday. Could you please explain to me what days between the beginning of Lent and Easter are not days of Lent and when those days begin and end according to the Church (example: sundown to sundown)? Also, are Feast Days, for example 3-19-17, St. Joseph’s Day, any different than the average day?