You want the PCs you support to have the right time for more reasons than keeping the users happy; for one thing, if every PC has a slightly different time, finding which version of a file was updated most recently gets much more complicated. Get your head around the Windows Time Service at http://technet.microsoft.com/en-us/library/cc773013.aspx, get the commands for making a PC get its time from the domain at http://technet.microsoft.com/en-us/library/cc758905.aspx and if you want a an alternative time server use uk.pool.ntp.org to get the time from a random time server in the NTP Pool Project (read about the project at http://www.pool.ntp.org/use.html) read more