Daylight saving time
Moscow (Russia) does not change clocks: UTC+3 all year. Seoul (South Korea) does not change clocks: UTC+9 all year.
Russia has not changed clocks since 2014; Moscow stays on UTC+3 all year.
Best time for a call
If both sides work 9:00–18:00 local time, the shared window is 09:00–12:00 in Moscow = 15:00–18:00 in Seoul (3 hours). Put recurring calls in this window and state the time with the city name (for example “14:00 Moscow time”) to avoid confusion. How to schedule a meeting across time zones.
How to read the chart
The left column is the local time in Moscow, the other column shows the same moment in Seoul. “+1 day” means it is already the next calendar day in Seoul, “−1 day” — still the previous one. Rows outside 9:00–18:00 are dimmed. The converter above works the other way too: press “Swap” to enter a time in Seoul.