ttj - Tom Jones

Crossing the Pacific westwards, the ship's time gets set back one hour at a time.  The ship's management arranges it so that at land stops, it is synchronised with the location.  Changes between one stop and the next are somewhat arbitrary, but the idea should be to keep changes smooth and have dawn and dusk at sensible wall times. I set around 5 clocks at each change. The Casio F-91W is the easiest.  I set the hour back using the three buttons on the watch.  The only annoyance is that I have to cycle +23 hours, as one can not decrement the hour directly.  It's not that annoying, and one knows it's going to work. For the Debian (Linux) laptop, I change the /etc/localtime symlink to point to location in /usr/share/zoneinfo/*/*, such as /usr/share/zoneinfo/America/Vancouver.  This is fine when there is a well-known city to select.  It sometimes involves research and experimentation to choose one with the correct (current) offset.  Once the symlink c...

Following on from " difference between timezone and offset ", Apple makes this mistake right in the middle of MacOS: No, dipshits, "British Summer Time" is not a time zone.  It is an offset, of plus one.  The time zone is London or what-have-you.  They are COMPLETELY DIFFERENT THINGS.

This is something I tried and failed to explain to a Computer Science graduate some years ago.  The Computer Science graduate assumed I was trying to make a point about seconds difference between UTC and GMT.  No.  I hope this doesn't count as slop, but Gemini can put it pretty well: User Question 1 what is the conceptual difference betwen a timezone and an offset AI Response 1 While they both help us tell time across the globe, a time zone and an offset are fundamentally different concepts. An offset is a static mathematical calculation, while a time zone is a dynamic geographic region governed by local laws. What is an Offset? An offset is the exact amount of time added to or subtracted from Coordinated Universal Time (UTC) to get the local time. Format: It is always expressed as a plus or minus sign followed by hours and minutes (e.g., +01:00 or -05:00). Nature: It is purely digital and mathematical. Limitation: It does not account for daylight saving time (DST) o...