How to change date and time on a apple ibook g4?

My ibook won't boot past the gray screen. I went into the open firmware and I saw my ibook has the wrong date and time. It has 01/01/1904 for the date. Could the wrong date and time be why it will not boot past the gray screen? Can you change the date and time inside of firmware. I am new to apple I don't know much at all about it.How to change date and time on a apple ibook g4?
Incorrect date in open firmware is a reflection of a change in the setting but does not affect startup. The most common cause of fall back to 1904 is resetting the PMU. Did you do that for any power management issue recently? Oddly enough, I would suggest resetting it now. See the link below.



Hang at the grey screen with no Apple logo can be caused by a logic board fault (very slight chance of this), hard drive fault, or a UNIX base system fault. To eliminate a logic board fault as a possibility, reset the PMU, and then restart while holding the alt / option key for 30 seconds. If you get the Startup Manager screen (two large arrow icons), the board is likely fine. Next, put the OS X install DVD in, wait about ten seconds for it to spin up, and then click the curved arrow. When the DVD icon appears and the cursor returns to a normal arrow, click the DVD icon, and press Return. Go past the language choice, and open Disk Utility from the Utilities menu. Select the hard drive at left. Select the ';First Aid'; tab. Click the ';Repair Disk'; button. Three paths to follow after that:



* If it finds problems, and repairs, click the ';Repair Disk'; button again.

* If it finds no problems, quit Disk Utility and move forward to click the ';Options'; button, and select ';Archive and Install'; (if there is enough available space on the drive) with a check / tick for ';Preserve Users and network settings';, or select ';Erase and install'; (if not enough available space).

* If it finds problems, and cannot repair, either buy a more robust disk repair utility such as TechTool Pro or Disk Warrior, or quit Disk Utility, and go forward to click the ';Options'; button, and select ';Erase and install';.