java日期格式(年月日时分秒毫秒)

package test.remote.tools.combine;  

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;  

public class TestOutDate
{
    public static void main(String[] args)
    {
        //method 1
        Calendar nowtime = new GregorianCalendar();
        String strDateTime="["+String.format("%04d", nowtime.get(Calendar.YEAR))+"/"+
                String.format("%02d", nowtime.get(Calendar.MONTH))+"/" +
                String.format("%02d", nowtime.get(Calendar.DATE))+" " +
                String.format("%02d", nowtime.get(Calendar.HOUR))+":" +
                String.format("%02d", nowtime.get(Calendar.MINUTE))+":" +
                String.format("%02d", nowtime.get(Calendar.SECOND))+"." +
                String.format("%03d", nowtime.get(Calendar.MILLISECOND))+"]";
        System.out.println(strDateTime);  

        //method 2
        String msg="";
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("YYYY/MM/dd HH:mm:ss.SSS");
        msg+="["+sdf.format(date)+"]";  

        System.out.println(msg);
    }
}  

运行结果：

[2018/04/25 02:51:33.379]

[2018/05/25 14:51:33.393]