global class CaseBatchPendingSchedule implements Schedulable {

    public static String sched = '0 0 01 1 * ?';  //Every 1st of the Month at 1am

    global static String scheduleMe() {
        CaseBatchPendingSchedule SC = new CaseBatchPendingSchedule();
        return System.schedule('Case Batch Close Job', sched, SC);
    }

    global void execute(SchedulableContext sc) {
        CaseBatchPending b1 = new CaseBatchPending();
        ID batchprocessid = Database.executeBatch(b1);
    }
}