MDT (Mountain Daylight Time) is one of the well-known names of UTC-6 time zone which is 6h. behind of UTC (Coordinated Universal Time).The time offset from UTC can be written as -06:00.
It's used as a DST (summer daylight saving time).During the winter, MST - Mountain Standard Time(UTC-7) is in use.
Some locations use MST all year long.
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