Date.fromString is NOT a pure function, result depends on local env

[witoldsz]

The result below depends on your local time zone.

"2017-07-25T20:31:23.647Z"
    |> Date.fromString
    |> Result.map (Date.hour >> toString >> (++) "The hour is: ")
    |> Result.withDefault ""

What I see is:

The hour is: 22

Run this: https://runelm.io/c/2su

Functions in Elm are supposed to be pure, this one is not, because it calls new Date(…) which produces a date with a time zone of the local environment (system).

P.S.
Just to be clear: this is not about the ambiguous input. The Z stands for UTC (ISO8601).

[process-bot]

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[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[witoldsz]

I can see the #816 does not address this particular issue.

[witoldsz]

I can see the #816 does not address this particular issue.

[lukewestby]

Added to #816, thank you!

[lukewestby]

Added to #816, thank you!