Fix negative timestamps parsing incorrectly #32
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jamesrweb
commented
Nov 21, 2022
| }, | ||
| "test-dependencies": { | ||
| "elm-explorations/test": "1.0.0 <= v < 2.0.0" | ||
| "elm-explorations/test": "2.0.0 <= v < 3.0.0" |
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Required change for the elm-test command to run.
| utcOffsetMinutesFromParts multiplier hours minutes = | ||
| -- multiplier is either 1 or -1 (for negative UTC offsets) | ||
| multiplier * (hours * 60) + minutes | ||
| multiplier * ((hours * 60) + minutes) |
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The actual fix to correct the implementation.
| import Expect | ||
| import Fuzz | ||
| import Iso8601 | ||
| import Json.Decode exposing (decodeString, errorToString) |
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Automatically sorted by elm-format.
| \_ -> | ||
| Iso8601.toTime "2019-05-30T06:30" | ||
| |> Expect.equal (Ok (Time.millisToPosix 1559197800000)) | ||
| , test "toTime supports negative timestamps (French Polynesia: Marquesas Islands)" <| |
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Closes #31
Currently the
utcOffsetMinutesFromPartshelper calculates the offset incorrectly by a slim margin, but enough to be concerning, when provided with negative timestamps such as those in the tests provided as part of this PR.To validate the changes you can paste the test case ISO-8601 strings into a converter like Dencode to see the stamps are correctly conforming as intended.
This is actually quite a surprising issue so kudos to @pd9333 for catching this one! 🎉