Universal Time is a standard by which all science data sets can be coordinated. It is based on a 24-hour clock.

Some simple conversions to local times are as follows:

Eastern Standard Time (EST) = Universal Time - 5 hours
Eastern Daylight Time (EDT) = Universal Time - 4 hours
Pacific Standard Time (PST) = Universal Time - 8 hours
Pacific Daylight Time (PDT) = Universal Time - 7 hours

For further information on time zones, go here.