ArgumentError: invalid date in ROR

Hello i finding average of array of dates. while running the code i am getting error as--> ArgumentError: invalid date in ROR

This is how my code looks like ---->

 arrays = [Tue, 08 Dec 2020 20:21:03 IST +05:30, Tue, 08 Dec 2020 20:21:05 IST +05:30]  # this is the date format i am getting from the database
 i = 0
  arrays.each do |array|   # arrays get value as array of dates 
    array1[i] = Date.parse(array.strftime('%Y-%d-%m')) # i am getting the error in this line 
    i = i+1
  end