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The time relativity principle

on YouTube 15m
Talkat Devoxx Belgium 2019 · 2019-11-04..11-08· [java]

speaker

name:Jakub Marchwicki
links:none on file

resources

video:https://youtu.be/1sqlOQZeGJw
slides:none on file

summary

Shows that epoch and offsets are concrete sources of bugs: some databases use 30 Dec 1899 as zero, .NET uses year 1 and Oracle 2004, so parsing an XML timetable into java.time.Instant via GregorianCalendar yields wrong instants and surprising offsets (historical zones like UTC+1:24 or DST shifts change results). Notes Samoa’s 29 Dec 2011 jump across the dateline and recommends domain models: use minutes-since-midnight or Duration for timetables instead of a naïve LocalDateTime.

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chapters (12)

  1. 0:00Introduction
  2. 0:45Time table
  3. 1:17Time zero
  4. 2:20Epoch
  5. 3:02Java
  6. 5:44Timezone changes
  7. 6:32Some More Island
  8. 7:59American Samoa
  9. 8:28Wall time
  10. 9:11Converting to string
  11. 10:50Timetable example
  12. 14:00Conclusion

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