You posted under Intermatic T100R (R for raintight) series timer.
Add a comment if you have different timer.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler
To set timer, lift and rotate dial clockwise until current time on dial lines up with silver pointer.
If dial is lagging or falling behind, then replace clock motor.
Add a comment for more help.
Upvote the help.
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