mountain time is how far behind central time
In the United States and Canada, the Mountain Time Zone is one hour ahead of the Pacific Time Zone and one hour behind the Central Time Zone. In some areas, starting in 2007, the local time changes from MST to MDT at 2 am MST to 3 am MDT on the second Sunday in March and returns at 2 am MDT to 1 am MST on the first Sunday in November.