so the app at dayjob has an internal scheduler, one of the formats for which handles, like, "on the 12th at 8am" tests for it were failing intermittently, in daily CI job only i'm curious if there are any devs out there whose trauma runs deep enough they already know the story
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okay, so here we go every day has a 2 AM, right? wrong. on, for example, March 14th, 2021, 2 AM Eastern time *will not exist* so if you specified "on the 14th at 2am", the scheduled job would *correctly* not run in March of 2021
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which is to say, this feature is *architecturally* broken by a 5-dimensional corner case that a sufficiently thorough test suite will catch in our case, it showed up because the CI job was run at 6 AM, which the UTC to Eastern offset from server to application converted to 2 AM
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oh, for a little extra cherry on top can you guess how many cases of this specific type of schedule being used exist in the app, outside of the test suite go on i bet you can guess if you try
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It would have taken less man-hours to have the team learn cron than it did to develop and debug this mess
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correct in one
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