Nov. 23, 2007
9:41 p.m.
On Fri, Nov 23, 2007 at 12:34:10PM -0600, Bill Seymour wrote:
What happens when switching to a named rule, but no such rule exists?
The Europe/Zurich example in zic.8.txt has an example of that (switches to Swiss rules in 1894, but there are no Swiss rules before 1940), but doesn't say what to do.
The important thing to remember is that the rules specify *transitions*. If there is no transition, then nothing changes, so the fact that the Swiss rules lack any transitions between 1894 and 1940 means that Europe/Zurich keeps their clocks at the same offset from UTC (or rather, given the time frame involved, from GMT) during the interval in question. --Ken Pizzini