If you need to know the exact time, you want to synchronize your PC with a Time Serveror do not understand what they mean by GMT, below is the help you need.
The US Naval Observatory Master Clock provides us with the current eastern standard time.
Please note this feature is optimized for Netscape 3.0 or greater, it does not work with Internet Explorer.
PC Time Synchronization
Do you want to synchronize your PC with one of those time servers? To download Windows software to synchronize your local clock to UTC(NIST)over the Internet click here. To download Windows software to synchronize your local clock using a direct dial-up connection to NIST click here.
GMT stands for Greenwich Mean Time or Universal Time. Follow the link to learn more about. Greenwich 2000
Local Time in Miami, USA is: