按照时间毫秒的计算
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Test {
public static void main(String[] args) throws ParseException {
String startDateStr = "2018-08-20";
String endDateStr = "2018-09-29";
int dayNum = differentDays(startDateStr, endDateStr);
System.out.println(dayNum);
}
public static int differentDays(String startDateStr, String endDateStr) throws ParseException {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date endTime = format.parse(endDateStr);
Date startTime = format.parse(startDateStr);
int days = (int) ((endTime.getTime() - startTime.getTime()) / (1000 * 3600 * 24));
return days;
}
}