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Daylight Shifting Time
The daylight bit is encoded so if the National Bureau of Standards
fixed their watches, yours will be okay too. Except my nine identical La Crosse radio wall clocks http://home.att.net/~rhhardin3/clock01.jpg mostly hung in pairs so as to see the lockstep seconds ticking off, which were on sale at Kroger for $8.99 each apparently because of a software bug, namely : They change times perfectly, but the next UTC midnight they revert back to the previous time, then at local 2am revert back to the correct time. Thus changing (in lockstep) six times a year. You can see the bug's source with a little thinking. WWV indicates UTC daylight time; which has to be remembered in a bit somewhere until 2am local time. They got that right. But then the UTC day changes, and the logic is screwed up, and the clock resets back until 2am local time again. Someday there LaCrosse clocks will be collectors' items, like the original HP-35 calculator with the error for log(2.02). Too bad if you sent it in to get fixed. LaCrosse denies there's anything wrong (``the clock is probably overloaded by the WWVB signal, which they increase in power when they go to daylight time'' no kidding) as long as the warranty is in effect. -- Ron Hardin On the internet, nobody knows you're a jerk. |
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