Keystone, South Dakota is located in the Mountain Time Zone, which means that the time is Mountain Standard Time (MST) during regular time
and Mountain Daylight Time (MDT) when daylight savings is in effect.
Mountain Standard Time
When it is Mountain Standard Time, Keystone, South Dakota is UTC-07:00 which means that it is -7 hours offset from
Coordinated Universal Time (UTC).
The Mountain Standard Time in Keystone, South Dakota (UTC-07:00) is shown in blue below:
Mountain Daylight Time
When it is Mountain Daylight Time, Keystone, South Dakota will be UTC-06:00 which means that it is -6 hours
offset from Coordinated Universal Time (UTC) and the time will be as follows in green:
As you can see, the difference between MST and MDT in Keystone, South Dakota is one hour, because the daylight savings is
adjusted by one hour.
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