timezone-history
This little program produces a list of the time zone offset for every day since 1880.
Here are some examples:
Timezone offsets for Berlin
Timezone offsets for Cairo
Timezone offsets for London
Timezone offsets for Paris
Timezone offsets for Vienna
C source code is in my Git repo
$Date: 2021-09-04 23:13:07 +0200 (Sat, 04 Sep 2021) $
