For a simple app I'm using to test a devops pipeline I'm outputting the start time of a build to the homepage. On my development machine the year of the ISO-8601 timestamp I expect, 2019, is printed (specifically, "2019-09-12T20:11:00.000Z"). When the same codebase is built using AWS CodeBuild the ISO-8601 timestamp looks like "+051668-02-09T08:09:32.000Z". What is "+051668"? I presume it's the year; My best guess is it's the year represented as a different calendar. Thoughts?

AWS CodeBuild sets this environment variable for every build (CODEBUILD_START_TIME). I'm building with their latest, default, Ubuntu container (v2.0).

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    @AuxTaco wow, guess this is wrong/incomplete then? i.imgur.com/LgnmacQ.png , deleted my comment – hanshenrik Sep 14 '19 at 8:54
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    @hanshenrik That grammar doesn't appear to allow for five-digit years at all. I hesitate to say it's wrong, since expanded years are "only allowed by mutual agreement of the partners in information interchange." – AuxTaco Sep 14 '19 at 9:28

Most of the google hits show CODEBUILD_START_TIME being represented as the number of milliseconds since 1970. I suspect somewhere in your code you are treating that as if it were seconds.

If you convert +051668-02-09T08:09:32.000Z to seconds you get 1568320819772. If you divide+round that by 1000 you get 1568320819 then convert that back to a human readable time you get September 12, 2019 8:40:19.

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    Yep, test data was a unix timestamp in seconds! Thought I had grabbed that timestamp directly from CodeBuild logs, but guess not. – trycrmr Sep 12 '19 at 23:11
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    Bad docs too; Amazon just says "the start time of the build" 😒 – Lightness Races in Orbit Sep 13 '19 at 12:30
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    Provided some feedback for the docs to be more specific about the timestamp via the link in the bottom right docs.aws.amazon.com/codebuild/latest/userguide/… . – trycrmr Sep 13 '19 at 14:23

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