Have toString display Date values in ISO format

[fredcy]

The core toString function returns the String value "{}" for all Date values. That makes it hard to display Date values for debugging. This patch extends toString to display Date values in ISO format like "<date 2016-01-14T15:06:41.393Z>".

Here is a test program that I've been using. On regular intervals it displays the value of Time.every (to show liveness) and the corresponding Date value:

import Date
import Effects
import Html exposing (li, text, ul)
import StartApp
import Time

app =
  StartApp.start
    { init = ( 0, Effects.none )
    , inputs = [ Time.every <| Time.second * 5 ]
    , update = \t -> always ( t, Effects.none )
    , view = always showTime
    }

showTime t =
  ul
    []
    [ li [] [ t |> toString |> text ]
    , li [] [ t |> Date.fromTime |> toString |> text ]
    ]

[mietek]

This is a duplicate of https://github.com/elm-lang/core/pull/442.

[mietek]

This is a duplicate of https://github.com/elm-lang/core/pull/442.

[jvoigtlaender]

So, can this pull request be closed? I notice that while it addresses the same issue as #442, it does propose a slightly different code change. Is the one here better than the other one? Why?

[jvoigtlaender]

So, can this pull request be closed? I notice that while it addresses the same issue as #442, it does propose a slightly different code change. Is the one here better than the other one? Why?

[fredcy]

I didn't notice https://github.com/elm-lang/core/pull/442 before opening this request. I'm OK with closing this request as a duplicate.

[fredcy]

I didn't notice https://github.com/elm-lang/core/pull/442 before opening this request. I'm OK with closing this request as a duplicate.

[jvoigtlaender]

Okay, I'm closing it, but copying your example program over to the other discussion, because it could be useful for testing over there as well.

[jvoigtlaender]

Okay, I'm closing it, but copying your example program over to the other discussion, because it could be useful for testing over there as well.