Java时间

1.获取当前时间的时间戳

//方法1
Date date = new Date();
Long times = date.getTime();
Timestamp timestamp =new Timestamp(times);
//方法2
long times = System.currentTimeMillis();
Timestamp timestamp =new Timestamp(times);
//方法3
long times= Calendar.getInstance().getTimeInMillis();
Timestamp timestamp =new Timestamp(times);

获取年月

		String start = "2020-5";
        if(StringUtils.isNotBlank(start)){
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            try {
                //起始月份
                Date billMonth = sdf.parse(start);
                Calendar startCal = Calendar.getInstance();
                startCal.setTime(billMonth);
                int startYear = startCal.get(Calendar.YEAR);
                int startMonth = startCal.get(Calendar.MONTH)+1;
                String startYearMonth = null;
                if(startMonth < 10){
                    startYearMonth = startYear + "0" + startMonth;
                }else{
                    startYearMonth = startYear + "" + startMonth;
                }
                System.out.println(startYearMonth);
            }catch (ParseException e){
                e.printStackTrace();
            }
        }

Date转ISO8601时间格式

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
String localTime = sdf.format(new Date());