René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ConvertFrom-JSON incorrectly deserializes dates to DateTime","articleBody":"When `ConvertFrom-JSON` guesses something in the input data can be converted to a `DateTime`, it (silently) does so.\r\n\r\nBut the conversion doesn't correctly interprets some strings.\r\n\r\n\r\n## Steps to reproduce\r\n\r\nI'm running this on a system that's on UTC+2 (CEST).\r\n\r\n```\r\nWrite-Host(\"PowerShell version: \" + $PSVersionTable.PSVersion.ToString())\r\n$date = \"2020-09-07T09:44:13.769Z\"\r\nWrite-Host (\"Original string: \" + $date)\r\nWrite-Host(\"Cast to Datetime: \" + [datetime] $date)\r\n$json = ('[{\"start\":\"' + $date + '\"}]') \r\nWrite-Host(\"JSON data: \" + $json)\r\n$data = $json |  ConvertFrom-Json\r\nWrite-Host($data[0].start.GetType().Name + \" resulting from ConvertFrom-JSON: \" + $data[0].start)\r\n```\r\n\r\n## Expected behavior\r\n\r\n```\r\nPowerShell version: 7.0.3\r\nOriginal string: 2020-09-07T09:44:13.769Z\r\nCast to Datetime: 09/07/2020 11:44:13\r\nJSON data: [{\"start\":\"2020-09-07T09:44:13.769Z\"}]\r\nDateTime resulting from ConvertFrom-JSON: 09/07/2020 11:44:13\r\n```\r\n\r\n## Actual behavior\r\n\r\n```\r\nPowerShell version: 7.0.3\r\nOriginal string: 2020-09-07T09:44:13.769Z\r\nCast to Datetime: 09/07/2020 11:44:13\r\nJSON data: [{\"start\":\"2020-09-07T09:44:13.769Z\"}]\r\nDateTime resulting from ConvertFrom-JSON: 09/07/2020 09:44:13\r\n```\r\n\r\n## Environment data\r\n\r\n```\r\nName                           Value\r\n----                           -----\r\nPSVersion                      7.0.3\r\nPSEdition                      Core\r\nGitCommitId                    7.0.3\r\nOS                             Microsoft Windows 10.0.17763\r\nPlatform                       Win32NT\r\nPSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}\r\nPSRemotingProtocolVersion      2.3\r\nSerializationVersion           1.1.0.1\r\nWSManStackVersion              3.0\r\n```\r\n\r\nThe same issue is still present in 7.1.0-preview.6.\r\n","author":{"url":"https://github.com/sba923","@type":"Person","name":"sba923"},"datePublished":"2020-09-07T11:12:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":32},"url":"https://github.com/13592/PowerShell/issues/13592"}