To create and test a schedulable class, let’s take a look at how to schedule the class using the user interface.

1. Create an apex which implemented the schedulable.

   global class ScheduleServiceExample implements Schedulable
   {
       global void execute(SchedulableContext SC)
       {     
           YourServiceClass.serviceExecute();
       }    
   }
   

2. Your Name -> Setup
3. App Setup -> Develop -> Apex Classes
4. Schedule Apex button at the top -> Click Schedule Apex button
5. Here you can manually schedule an apex class which implemented the schedulable interface.