import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
 
public class Test {
    public static void main(String[] args) {
        Date date = new Date();
        List<Date> ds = test(date);
         
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        for (Date d : ds) {
            System.out.println(sdf.format(d));
        }
    }
     
    static List<Date> test(Date date) {
        Date start = dayStartDate(date);//转换为天的起始date
        Date nextDayDate = nextDay(start);//下一天的date
         
        List<Date> result = new ArrayList<Date>();
        while (start.compareTo(nextDayDate) < 0) {
            result.add(start);
            //日期加15分钟
            start = addFiveMin(start, 15);
        }
         
        return result;
    }
 
    private static Date addFiveMin(Date start, int offset) {
        Calendar c = Calendar.getInstance();
        c.setTime(start);
        c.add(Calendar.MINUTE, offset);
        return c.getTime();
    }
 
    private static Date nextDay(Date start) {
        Calendar c = Calendar.getInstance();
        c.setTime(start);
        c.add(Calendar.DATE, 1);
        return c.getTime();
    }
 
    private static Date dayStartDate(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        return c.getTime();
    }
}