my_array = [["01-Jan-2000", "430.0"], ["27-Apr-2006", "430.0"], ["05-Dec-2007", "707.0"], ["30-Mar-2006", "430.0"], ["14-Oct-2006", "687.0"], ["11-Apr-2007", "647.0"]]
myarray.delete_if {|x|
x[0]=="10-Jan-2000"
}