How do I adjust the clock - 2000 Nissan Pathfinder

Somewhere on the lower part of the dash, you will find a small thumbwheel that increases the brightness.

It might be shown in here. 'Year make model' are important.

Hope this helps
If you are talking about the clock on the DVD display then.....

Audio display model
1. Turn the audio unit on by pushing the "PWR"
button.
2. Push the "MENU" button until the display
indicates the clock adjustment mode.
If the "CLOCK OFF" is indicated on the display,
push the "TUNE" button to change the mode
to "CLOCK ON". Then push the "MENU" button
The time indicator will flash.
3. Push the "SEEK TRACK" button to adjust
the hour.
Push the "TUNE" button to adjust the
minute.
Pushing the , buttons will advance
and , buttons will turn back
the time.
4. Push the "MENU" button to finish the
adjustment.

Push clock button in and hold until it blinks.
button #5 is hour adjust.
button #6 is the minute adjust.
button #4 is set.

Make sure the clock is set to the correct time zone before trying to set the time.

Press the radio on button and hold down.
A menu appears, displaying Adjust Initial Volume, release the power button.
Turn volume button to the right to display the Clock menu item.
Press the power button to select the Clock Menu item.
Rotate the volume button to adjust the hour.
Press the power button to move to minutes adjustment.
Rotate the volume button to adjust the minutes.

Clock Setting Procedure (digital clock page 242 of your owners manual)
1. Press and hold the time button until the hours blink.
2. Adjust the hours by turning the right side Tune/
Audio control.
3. After the hours are adjusted, press the right side
Tune/Audio control to set the minutes. The minutes will
begin to blink.
4. Adjust the minutes using the right side Tune/Audio
control.
5. To exit, press any button/knob or wait 5 seconds.

SETTING THE ANALOG CLOCK (page 238 of your owners manual)
To set the analog clock at the top center of the instrument
panel, press and hold the button until the setting is
correct. The clock will adjust slowly at first and then
quicker the longer the button is held.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Clock Setting Procedure (digital clock page 242 of your owners manual)
1. Press and hold the time button until the hours blink.
2. Adjust the hours by turning the right side Tune/
Audio control.
3. After the hours are adjusted, press the right side
Tune/Audio control to set the minutes. The minutes will
begin to blink.
4. Adjust the minutes using the right side Tune/Audio
control.
5. To exit, press any button/knob or wait 5 seconds.

SETTING THE ANALOG CLOCK (page 238 of your owners manual)
To set the analog clock at the top center of the instrument
panel, press and hold the button until the setting is
correct. The clock will adjust slowly at first and then
quicker the longer the button is held.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Clock set:

To adjust the clock, press the tune knob for longer than 1.5 seconds. A beep signals entry into the clock adjustment mode and
CL appears in the display. The hours will be blinking. Rotate the tune knob to adjust the hours to the desired level.

Press the tune knob a second time and the minutes will start to blink. Rotate the tune knob to adjust the minutes to the
desired level. After 10 seconds, the radio or CD display will reappear. Once the clock is set to the desired level, press the knob repeatedly until the radio or CD display reappears.

All done!

Turn the radio off then hit the clock button. You can then use the volumn button to adjust the time. It took me a while to figure it out too, LOL.

Here you can download user manual in pdf format
From page 107 on Manual:

"Clock operation:

The clock is on in the display regardless of
what mode, media, or function the radio is in
as long as the ignition is in ACC or ON.
Clock set
To adjust the clock, press the knob
for longer than 1.5 seconds. A beep signals
entry into the clock adjustment mode and
CL appears in the display. The hours will be
blinking. Rotate the knob to adjust
the hours to the desired level.
Press the knob a second time and
the minutes will start to blink. Rotate the
knob to adjust the minutes to the
desired level.
After 10 seconds, the radio or CD display
will reappear. Once the clock is set to the
desired level, press the knob repeatedly
until the radio or CD display reappears."