Nope, wrong for Soviet Union, it spanned 11 time zones: Kaliningrad (Königsberg) to Petropavlovsk-Kamchatsky, with summer/winter time. By the way, there's anot

Nope, wrong for Soviet Union, it spanned 11 time zones: Kaliningrad (Königsberg) to Petropavlovsk-Kamchatsky, with summer/winter time. By the way, there's another opportunity for oddity wrt. time: the change from summer to winter time and back can occur at different dates in different countries. And indeed, it does.