时间java

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一、当前时间

1.
Calendar now=Calendar.getInstance();
String time=now.get(Calendar.YEAR)+"-"+(now.get(Calendar.MONTH)+1)+"-"+now.get(Calendar.DAY_OF_MONTH)+" "
    +now.get(Calendar.HOUR_OF_DAY)+":"+now.get(Calendar.MINUTE)+":"+now.get(Calendar.SECOND);


2.
24小时制
SimpleDateFormat tempDate = new SimpleDateFormat("yyyy-MM-dd" + " " + "HH:mm:ss");
String datetime = tempDate.format(new java.util.Date());
12小时制
SimpleDateFormat tempDate = new SimpleDateFormat("yyyy-MM-dd" + " " + "hh:mm:ss");
String datetime = tempDate.format(new java.util.Date());

二、程序运行时间

long begin,end,time;
Date mydate=new Date();
begin=mydate.getTime();

Date mydate2=new Date();
end=mydate2.getTime();
time=end-begin;