Irkutsk Time (IRKT) is the time zone eight hours ahead of UTC (UTC+08:00) and 5 hours ahead of Moscow Time (MSK+5).
| 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) |
The time zone covers Buryatia and Irkutsk Oblast.
On 27 March 2011, Russia moved to year-round daylight saving time. Instead of switching between UTC+08:00 in winter and UTC+09:00 in summer, Irkutsk Time became fixed at UTC+09:00 until 2014, when it was reset back to UTC+08:00 year-round.[1]