Time difference between You and Moscow Time
In June & July 2018 you are X hours ahead/behind Moscow time.
All matches during 2018 FIFA World Cup in Russia will be played at 12 venues located in 4 time zones. Moscow time (MSK, UTC+3) will be observed
at 9 venues. USZ1 (UTC+2) is observed in Kaliningrad, SAMT (UTC+4) is observed in Samara and YEKT (UTC+5) is observed in Yekaterinburg.
There is no daylight saving time (DST) in Russia, so Moscow time (3 hours ahead UTC) is observed throughout the whole year.
In June and July you are X hours ahead/behind UTC. So, time difference between your local time and MSK time during FIFA World Cup in Russia is Y hours.
That means you should add/subtract X hours to/from Moscow time to get your local time, and subtract/add X hours from/to your time
to get Moscow time.