【一】SimpleDateFormat 格式化程式碼------

// 輸出"年-月-日 時:分:秒 星期"

// 其中時間顯示是12小時制的，如果需要顯示24小時制，只需將hh換成kk
// 星期的表示 4個E是完全形式，一個E是縮寫
// 格式可以隨便改的

SimpleDateFormat simpleDateFormat = new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss EEEE");

Calendar calendar = Calendar.getInstance();

// 返回這個calendar的Date物件
 

Date calendarDate = calendar.getTime();
// 已yyyy-MM-dd kk:mm:ss格式化calendarDate物件，並轉化成String物件
String time =simpleDateFormat.format(calendarDate );

public static String format24HourString(Context context, String time) {
        boolean is24Hour = DateFormat.is24HourFormat(context);
        Log.d("ljb", "time:" + time + ";is24Hour:" + is24Hour);
        String[] timeStrings = time.split(":");
        if (timeStrings.length < 2) {
            return time;
        }
        if (!is24Hour) {
            String hourString = timeStrings[0];
            String minString = timeStrings[1];
            int hour = Integer.parseInt(hourString);
            if (hour > 12) {
                hour = hour - 12;
                return hour + ":" + minString + " "
                        + context.getResources().getString(R.string.str_pm);
            } else if (hour == 12) {
                return hour + ":" + minString + " "
                        + context.getResources().getString(R.string.str_pm);
            } else {
                return hour + ":" + minString + " "
                        + context.getResources().getString(R.string.str_am);
            }
        } else {
            return time;
        }
    }
    public static String converHourFormat(Context context, String hour) {
        boolean is24hFormart = DateFormat.is24HourFormat(context);
        if (!is24hFormart) {
            String AmOrPm = context.getResources().getString(R.string.str_am);
            int hourTemp = Integer.parseInt(hour);
            if (hourTemp > 12) {
                AmOrPm = context.getResources().getString(R.string.str_pm);
                hourTemp -= 12;
            } else if (hourTemp == 12) {
                AmOrPm = context.getResources().getString(R.string.str_pm);
            } else {
                AmOrPm = context.getResources().getString(R.string.str_am);
            }
            return AmOrPm + " " + hourTemp;
        } else {
            return hour;
        }
    }
    public static String dateFormate(Context context, Time curTime) {
        String dateformat = SystemProperties.get("persist.sys.dateformat", "1");
        if ("0".equals(dateformat)) {
            dateformat = "%m/%d/%Y";
        } else if ("1".equals(dateformat)) {
            dateformat = "%d/%m/%Y";
        } else {
            dateformat = "%Y/%m/%d";
        }
        return curTime.format(dateformat);
    }
    public static String dateFormate(Context context, Date curDate) {
        String dateformat = SystemProperties.get("persist.sys.dateformat", "1");
        if ("0".equals(dateformat)) {
            dateformat = "MM-dd-yyyy";
        } else if ("1".equals(dateformat)) {
            dateformat = "dd-MM-yyyy";
        } else {
            dateformat = "yyyy-MM-dd";
        }
        return DateFormat.format(dateformat, curDate).toString();
    }