[tz] Europe/London Sat Oct 26 23:00:00 1968 UT

Paul Eggert eggert at cs.ucla.edu
Mon Sep 15 05:20:11 UTC 2014

> Looks like isdst should be 1 on
>      Europe/London  Sat Oct 26 23:00:00 1968

The convention is that if clocks are the same all year round and if this 
appears to be intended to be permanent, the isdst flag is zero even if 
the enabling legislation uses phrases like "daylight" or "summer".  An 
example of that is the Turks & Caicos change in November.

My vague impression is that that three-year period you're talking about 
was intended to be permanent.  I haven't researched this, though.

More information about the tz mailing list