java学习-获取当前毫秒数,毫秒转时间,时间计算,时间转毫秒,时间相关

时间有关

+1s

1、获取当前毫秒数

long t1=System.currentTimeMillis();

2、毫秒数转换为时间

Date date2=new Date();
date2.setTime(t1);
System.err.println(date2);

3、时间格式化

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");
String fmDate=simpleDateFormat.format(date2);
System.err.println(fmDate);

4、字符串格式时间获取毫秒数

String sdate = "2018-06-01 06-06-06";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");
long time = simpleDateFormat.parse(sdate).getTime();
System.err.println(time);

5、毫秒数的计算

把两个毫秒数差值传进来就可以看见相差多久

原贴：https://blog.csdn.net/sunshinestation/article/details/4568946

public static String formatDuring(long mss) {  
	    long days = mss / (1000 * 60 * 60 * 24);  
	    long hours = (mss % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60);  
	    long minutes = (mss % (1000 * 60 * 60)) / (1000 * 60);  
	    long seconds = (mss % (1000 * 60)) / 1000;  
	    return days + " days " + hours + " hours " + minutes + " minutes "  
	            + seconds + " seconds ";  
	}