[zh-hans] Translate basics/date-time lesson (#1585)
[zh-hans] Translate basics/date-time lesson (#1585)

* Copy english content

* [zh-hans] Translate basics/date-time lesson

nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir_school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir-school