beginning_of_month

# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 195
  def beginning_of_month
    #self - ((self.mday-1).days + self.seconds_since_midnight)
    change(:day => 1,:hour => 0, :min => 0, :sec => 0, :usec => 0)
  end