This code set test start and end time
Calendar cal = new GregorianCalendar();
cal.setTimeInMillis(0);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.YEAR, 2013);
cal.set(Calendar.MONTH, Calendar.JANUARY);
cal.set(Calendar.HOUR_OF_DAY, 0);
Calendar cal2 = new GregorianCalendar();
cal2.setTimeInMillis(0);
cal2.set(Calendar.DAY_OF_MONTH, 1);
cal2.set(Calendar.YEAR, 2015);
cal2.set(Calendar.MONTH, Calendar.APRIL);
cal2.set(Calendar.HOUR_OF_DAY, 0);
client.setDataInterval(ITesterClient.DataLoadingMethod.ALL_TICKS, cal.getTimeInMillis(), cal2.getTimeInMillis());