To check weekday of a month

I have a date such as April,1,2009. I want to know what the weekday is, i.e. whether April 1 is a Monday, Tuesday etc. Likewise I want to check weekday of each day in the month of April.

From stackoverflow

• Use the DayOfWeek property:

  new DateTime(2009, 4, 1).DayOfWeek
  

• You can use the DayOfWeek property.

• If your computer language of choice doesn't have a DayOfWeek function, you can use Zeller's Congruence which returns the day of the week using simple integer arithmetic.