4 ms·

I love these clocks! I've had a few in every house I've lived in, from all along the West Coast and Midwest.

lxgr 2y ago
Since the equivalent European signal I'm familiar with only covers a single timezone, with unified DST rules, I'm curious: Do these usually have an adjustment button for a time zone offset? And how do they handle DST – do they have an "I'm in Arizona (but not in the Navajo Nation), leave me on standard time" switch?
- V99 2y ago
  They usually have an offset and a DST option. So in Arizona you'd choose -7/Off, and never touch it again. In Colorado you'll have to toggle DST twice a year manually, because it doesn't know the rules for when it starts/ends.
  - lxgr 2y ago
    Oh, is there no “DST in effect” flag in the signal? As I understand it, the US switches at the same day across the country (for the states that do have it), so that should theoretically be possible.
    - deleted 2y ago
      [deleted]
    - quintushoratius 2y ago
      Not every region of the continental US respects DST.
      - lxgr 2y ago
        I know, but if it does, it switches on the same day as all the others, which could be encoded in the signal, and it seems like it is [1]. So instead of a switch to “add an hour”, there could be one that says “add an hour if the signal says DST is currently in effect”. [1] https://en.wikipedia.org/wiki/WWVB#Amplitude-modulated_time_code https://en.wikipedia.org/wiki/WWVB#Amplitude-modulated_time_...
    - joezydeco 2y ago
      The time code format does include a DST bit. https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwv/wwv-and-wwvh-digital-time-code https://www.nist.gov/pml/time-and-frequency-division/time-di...
  - o11c 2y ago
    You shouldn't have to toggle DST manually; it's encoded at :57-58. That said, my clock stopped syncing for some reason, so ...
    - wglb 2y ago
      The one remaining clock I have took a hard fall, and no longer syncs.
deleted 2y ago
[deleted]

lxgr 2y ago

Since the equivalent European signal I'm familiar with only covers a single timezone, with unified DST rules, I'm curious: Do these usually have an adjustment button for a time zone offset? And how do they handle DST – do they have an "I'm in Arizona (but not in the Navajo Nation), leave me on standard time" switch?

V99 2y ago
They usually have an offset and a DST option. So in Arizona you'd choose -7/Off, and never touch it again. In Colorado you'll have to toggle DST twice a year manually, because it doesn't know the rules for when it starts/ends.
- lxgr 2y ago
  Oh, is there no “DST in effect” flag in the signal? As I understand it, the US switches at the same day across the country (for the states that do have it), so that should theoretically be possible.
  - deleted 2y ago
    [deleted]
  - quintushoratius 2y ago
    Not every region of the continental US respects DST.
    - lxgr 2y ago
      I know, but if it does, it switches on the same day as all the others, which could be encoded in the signal, and it seems like it is [1]. So instead of a switch to “add an hour”, there could be one that says “add an hour if the signal says DST is currently in effect”. [1] https://en.wikipedia.org/wiki/WWVB#Amplitude-modulated_time_code https://en.wikipedia.org/wiki/WWVB#Amplitude-modulated_time_...
  - joezydeco 2y ago
    The time code format does include a DST bit. https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwv/wwv-and-wwvh-digital-time-code https://www.nist.gov/pml/time-and-frequency-division/time-di...
- o11c 2y ago
  You shouldn't have to toggle DST manually; it's encoded at :57-58. That said, my clock stopped syncing for some reason, so ...
  - wglb 2y ago
    The one remaining clock I have took a hard fall, and no longer syncs.

deleted 2y ago

[deleted]