Find maximum and minimum in two dates

[LostKobrakai]

@nunobernardes99

I’ve found out that using max and min functions from Kernel would work.

That doesn’t properly compare dates:

iex(3)> max(~D[2020-12-18], ~D[2020-08-21])
~D[2020-08-21]

For comparing dates you should either use Date.compare or Enum.sort(list, Date).