From the man page...
date [OPTION] [MMDDhhmm[[CC]YY][.ss]]
This has to be run as root. you have to specify at least the month, day, hour, and minute, so to set the time to 4:00 PM on August 7th, you would run the command date 08071600.
If you need to change the year you can add the year onto the end of the number, and if you want to set it down to the second, you use a period, then the number of seconds, at the very end of the number. So, to set it to 4:00:23 PM on August 7th, you would use date 08071600.23. And in the case of it having been set back to 1977 like digiot mentioned, you would just use the command date 080716002003.23 to set it to the appropriate year.
Last edited by Locura; 08-08-2003 at 10:04 AM.