Universal Time

UT stands for Universal Time. UT is what used to be called Greenwich Mean Time or GMT.

Inside the continental United States, you can convert to the standard time in your timezone by subtracting the proper number of hours:

EST = UT - 5

CST = UT - 6

MST = UT - 7

PST = UT - 8

In the summer with daylight savings time, the conversion is:

EDT = UT - 4

CDT = UT - 5

MDT = UT - 6

PDT = UT - 7

For more information on timekeeping, see this link. For more on converting between standard time and universal time, go here.