Russia spans 11 official time zones — more than any other country in the world — ranging from UTC+2 in Kaliningrad to UTC+12 in Kamchatka. Russia abolished daylight saving time in 2014 and all zones remain fixed year-round.
Moscow Time (MSK, UTC+3) is the national reference: Moscow, St. Petersburg, Kazan, Nizhny Novgorod, and Volgograd all use MSK. Kaliningrad (the Baltic exclave) uses UTC+2, one hour behind Moscow. Samara and Udmurtia use UTC+4 (MSK+1). Yekaterinburg, Chelyabinsk, and Tyumen use UTC+5 (MSK+2). Omsk uses UTC+6. Novosibirsk, Krasnoyarsk, and Tomsk use UTC+7 (MSK+4). Irkutsk and Buryatia use UTC+8 (MSK+5). Yakutsk and Chita use UTC+9 (MSK+6). Vladivostok and Khabarovsk use UTC+10 (MSK+7). Magadan and Sakhalin use UTC+11. Kamchatka and Chukotka use UTC+12.
The span from Kaliningrad to Kamchatka is 10 hours — when it is noon in Moscow, it is 10 PM in Vladivostok and midnight in Kamchatka. Scheduling across Russian time zones requires knowing the specific city's UTC offset, not just 'Russia time'.