Irkutsk Time
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| KALT | Kaliningrad Time | UTC+2 | (MSK−1) | |
| MSK | Moscow Time | UTC+3 | (MSK±0) | |
| SAMT | Samara Time | UTC+4 | (MSK+1) | |
| YEKT | Yekaterinburg Time | UTC+5 | (MSK+2) | |
| OMST | Omsk Time | UTC+6 | (MSK+3) | |
| KRAT | Krasnoyarsk Time | UTC+7 | (MSK+4) | |
| IRKT | Irkutsk Time | UTC+8 | (MSK+5) | |
| YAKT | Yakutsk Time | UTC+9 | (MSK+6) | |
| VLAT | Vladivostok Time | UTC+10 | (MSK+7) | |
| MAGT | Magadan Time | UTC+11 | (MSK+8) | |
| PETT | Kamchatka Time | UTC+12 | (MSK+9) |
Irkutsk Time Zone (IRKT) is the time zone five hours ahead of Moscow Time (MSK+5).
Before 27 March 2011, Irkutsk Time was eight hours ahead of UTC in winter (UTC+8) and nine hours ahead of UTC in summer (Irkutsk Summer Time (IRKST), UTC+9, MSD+5).
On 27 March 2011, Russia moved to year-round daylight saving time. Instead of switching between UTC+8 in winter and UTC+9 in summer, Irkutsk Time became fixed at UTC+9.
The time zone may be also referred to as Buryatia Time.