Check the accuracy of your System Clock on a Windows computer. Time.is is a free online service that lets you do it using an Atomic Clock.

Type the following command at the prompt, replacing the date, time and time zone with the date, time and time zone you want to set, and then press "Enter." This command sets the system clock.date ...

Change time on remote system from command prompt [or ... BR><BR>If he ran the command "net time \\computername /set" on a machine with the correct time, it would set the clock on that ...