java 中將日期轉換爲毫秒 ,將毫秒轉換爲日期

     將毫秒轉換爲日期

public static String getHmToDate(String hm){

DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
long now = Long.parseLong(hm);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(now);
return dateFormat.format(calendar.getTime());

}

      將日期轉換爲毫秒

public static long getDateToHm(String date){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
try {
return simpleDateFormat.parse(date).getTime();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return 0;
}