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  • If you can un-sync your machine from an NTP time source, can you set the date/time to something just before the changeover and watch what happens as you approach the DST changeover? Or use an isolated virtual machine?
    – Doug Deden
    Commented Apr 1, 2020 at 13:55
  • @DougDeden - If I unsync from a NTP time source, won't that mean that my computer won't switch to/from Daylight saving time? Or is daylight saving hard-coded from some internal calendar? Commented Apr 1, 2020 at 14:33
  • It should still switch. All the NTP source tells you is UTC. Your local machine then gets to decide how to display that to the user, and if/when to change by an hour for DST.
    – Doug Deden
    Commented Apr 1, 2020 at 14:35