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Infinite loop in macOS Night Shift in the summer near the Arctic Circle (twitter.com)

588 points by guessmyname · 2671 days ago · 164 comments on HN

Article summary

The article appears to discuss an issue with macOS Night Shift near the Arctic Circle during the summer, where the feature gets stuck in an infinite loop. The exact details of the article are not available, but the comments suggest it is related to the software's handling of time and daylight hours. The problem is likely due to the unique daylight patterns near the Arctic Circle, where the sun does not set below the horizon for part of the year. This creates an edge case that the software is not designed to handle.

Main themes

  • time and daylight handling
  • edge cases in software
  • geographical exceptions
  • Arctic Circle daylight patterns
  • software development challenges

What commenters say

  • The issue highlights the importance of considering unusual geographical locations when developing software that handles time and daylight hours.
  • Assuming every day has a sunrise and sunset is a common falsehood that programmers believe, and it can lead to bugs like this one.
  • It is unreasonable to expect software to handle 100% of edge cases, but knowing about common exceptions like the Arctic Circle's daylight patterns is a reasonable expectation.
  • The complexity of time zones and daylight saving time is a significant challenge in software development, and it can lead to confusing and inconsistent rules.
  • Simplifying time zone handling by using general terms like 'Eastern' instead of 'EST' or 'EDT' can help avoid confusion and inaccuracies.
  • The solution to avoiding bugs like this one is not to reduce arrogance, but to stop assuming that problems are simple and to consider a wide range of edge cases.
  • Daylight saving time is a complex and sometimes confusing system that can lead to inconsistencies and errors in software that handles time zones.
  • Considering the complexity of time zones and daylight saving time, it may be more practical to use alternative methods, such as mechanical watches or local time standards, to avoid the confusion and inconsistencies of modern time-keeping systems.