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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`datetime.fromtimestamp(t).astimezone()` fails for `0`\u003c=`t`\u003c`86400` in Windows","articleBody":"# Bug report\r\n\r\n`dt.datetime.fromtimestamp(t).astimezone()` fails for `0`\u003c=`t`\u003c`86400` in Windows for at least python 3.9, 3.10, 3.11.\r\nWorks fine in Linux, Mac.\r\n\r\n```python\r\n\u003e\u003e import datetime as dt\r\n\u003e\u003e dt.datetime.fromtimestamp(0)\r\ndatetime.datetime(1970, 1, 1, 1, 0)\r\n\r\n\u003e\u003e dt.datetime.fromtimestamp(86400)\r\ndatetime.datetime(1970, 1, 2, 1, 0)\r\n\r\n\u003e\u003e dt.datetime.fromtimestamp(0).astimezone()\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\nOSError: [Errno 22] Invalid argument\r\n\r\n\u003e\u003e dt.datetime.fromtimestamp(86399).astimezone()\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\nOSError: [Errno 22] Invalid argument\r\n\r\n\u003e\u003e dt.datetime.fromtimestamp(86400).astimezone()\r\ndatetime.datetime(1970, 1, 2, 1, 0, tzinfo=datetime.timezone(datetime.timedelta(seconds=3600), 'W. Europe Standard Time'))\r\n```\r\n\r\nA screenshot also:\r\n![F1qM1ZmXgAAVrTw](https://github.com/python/cpython/assets/1658405/5659938e-2523-4b48-98f2-dd7b4aeeed8c)\r\n\r\n# Your environment\r\n\r\n- CPython versions tested on: 3.9, 3.10, 3.11\r\n- Operating system and architecture: Windows\r\n\r\n# Additional information\r\n\r\nThis looks very very related to this issue: https://github.com/python/cpython/issues/73283 but now it seems to happen for `astimezone`.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-107176\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/LefterisJP","@type":"Person","name":"LefterisJP"},"datePublished":"2023-07-22T23:09:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/107078/cpython/issues/107078"}