Clock dial doesn't move - Intermatic T8845PV - Sprinkler-Irrigation Timer - 14-Day Skipper - NEMA 3R

Difficult to know without seeing it or having a make and model. If it is digital, it will be buttons, if analogue, a small dial/knob on the back as part of the battery housing. If the hands are not covered you can move the minute hand back one full turn.

Copy following link for setting analog timers by experimenting with features:
http://waterheatertimer.org/How-to-set-timers.html

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I assume you have looked on the Internet to find the manual. Even with all the trillions of things you can find, probably no one has uploaded that manual yet. I had a clock shop for over 30 years. Most grandfather calendar dials can be set by using a NEW pencil eraser. Try to use it near the center of the dial, not on the outside edge. Move the dial clockwise. I suggest a new pencil eraser because a used one can leave smudges on the dial.

Take out all 3 batteries. Move the hands to 5:50. Put batteries back. Start turning the white dial to correct time. As you're turning, if the clock is silent after 9 o'clock, you are on PM. For am, continue turning white dial to 6 o'clock when the bird sounds will start again and then to the correct AM time.

Clock motor has gone bad.
I have no source or part number for the clock motor.
Paragon is no longer making timers and parts.
Patriot shows they still sell 1015-00rs for $187
http://www.patriot-supply.com/products/showitem.cfm/55171

http://waterheatertimer.org/Paragon-timers-and-manuals.html#1015
Intermatic crossover shows T1975 is replacement 120V product T1976 for 240V
Clock motors and trippers are made for Intermatic product.
Grainger sell T1975 for $126
http://www.grainger.com/Grainger/INTERMATIC-Indoor-Multi-Operation-Timer-6X761?cm_mmc=GoogleBase-_-Electrical-_-Timers-_-6X761&ci_src=14110944&ci_sku=6X761
At Intermatic
http://www.intermatic.com/products/ec%204%20layer/mechanical%20time%20switches/24%20hour/t1900%20t1970%20series.aspx

Open following link to identify timer, with information for trippers and replacement clock motor:
http://waterheatertimer.org/Tork-timers-and-manuals.html#1101

The clock motor rotates analog timer dial clockwise as time passes.
Trippers on the dial move lever that rotates a cam that opens and closes electric circuit.
To set current time, manually rotate timer dial until current time lines up with the word Timer located near the 5 o'clock position.
If the dial is not rotating oe keeping good time, then clock motor is bad.
If trippers don't move the lever, then trippers are worn down.

Add a comment for more help.

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More information is needed.

Open following link for Intermatic-Malibu resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

You say clock doesn't work.
Add a comment with following information:
Do you have timer with analog dial?
Does dial rotate as time passes?
Does dial keep good time?
Have you put the black and red trippers in place?
Are trippers push all the way down?
Have you set current time by rotating clock dial 2 full turns before rotating dial to current time?

Intermatic/Malibu ML series timers come with 5-year warranty.
Product is covered by warranty.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
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The dial is turned by electric motor and it should have power.  

Yes.

Programming Instructions for the Intermatic T101 - 24 Hr. Dial Time Switch:
1. TO SET ON AND OFF TIMES: Hold trippers agains edge of clock-dial, pointing to time (AM or PM) when ON and OFF operations are desired, tighten tripper screws firmly. For additional tripper pairs on CLOCK-DIAL order 156T1978A.

2. TO SET TIME-OF-DAY: Pull CLOCK-DIAL outward. Turn in either direction and align the exact time-of-day on the CLOCK-DIAL (the time now, when switch is being put into operation) to the pointer. DO NOT MOVE POINTER.

Operating Instructions:
* To operate switch manually: move manual lever below clock-dial left or right as indicate by arrows (graphics) This will not efect next operation.
* In case of power failure, reset clock-dial to proper time-of-day. See Programing Instructions (top lines).

Good luck (reemmber rated this help).

Will the unit spin if you manually turn the timer dial to spin? If so, remove power, remove the clock motor from the timer, and inspect the clock and mating timer gearing for debris or damaged gear teeth. At the worst, replace the timer. You may be able to scrape or file the damaged teeth so that the timer will progress.