[转] android 日期时间格式转换

android日期时间格式转换：

private static int flagsDate = DateUtils.FORMAT_SHOW_DATE;
private static int flagsTime = DateUtils.FORMAT_SHOW_TIME ;
private static int flagsWeek = DateUtils.FORMAT_SHOW_WEEKDAY;
String dateStr = (String)DateUtils.formatDateTime(context, System.currentTimeMillis(), flagsDate);//5月11日
String timeStr = (String)DateUtils.formatDateTime(context, System.currentTimeMillis(), flagsTime);//16：40
String weekStr = (String)DateUtils.formatDateTime(context, System.currentTimeMillis(), flagsWeek);//星期二

12小时格式时，获取上午还是下午：

String smPmStr = DateUtils.getAMPMString(Calendar.getInstance().get(Calendar.AM_PM));//上午（下午）

 

12小时时间格式时，只显示时间，不显示“上午“这样的字符串：

 

private final static String M12 = "h:mm";
private final static String M24 = "kk:mm";
formatTime = android.text.format.DateFormat.is24HourFormat(context)? M24 : M12;
String timeStr = (String) DateFormat.format(formatTime,System.currentTimeMillis());

 将系统当前事件，转化为所需格式：

long dateTaken = System.currentTimeMillis();
if (dateTaken != 0) {
        String datetime = DateFormat.format("yyyy:MM:dd kk:mm:ss", dateTaken).toString();
        Log.e(TAG,"datetime : " +  datetime);
                
}

 如果为今天，则显示时间，如果不是今天则显示日期：

private String getDate(long dateTime)
	    {
	    	int flags = 0;
			String date = "";
			
			if (DateUtils.isToday(dateTime))
			{
				flags = DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_24HOUR;
				date = (String)DateUtils.formatDateTime(mContext, dateTime, flags);
			} 
			else
			{
				flags = DateUtils.FORMAT_SHOW_DATE;
				date = (String)DateUtils.formatDateTime(mContext, dateTime, flags);
			}
	        return date;
	    }

 在源码短信息模块中MessageUtils.java中有这样一个函数，与上面的功能相同：

public static String formatTimeStampString(Context context, long when, boolean fullFormat) {
        Time then = new Time();
        then.set(when);
        Time now = new Time();
        now.setToNow();
        // Basic settings for formatDateTime() we want for all cases.
        int format_flags = DateUtils.FORMAT_NO_NOON_MIDNIGHT |
                           DateUtils.FORMAT_ABBREV_ALL |
                           DateUtils.FORMAT_CAP_AMPM;
        // If the message is from a different year, show the date and year.
        if (then.year != now.year) {
            format_flags |= DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_SHOW_DATE;
        } else if (then.yearDay != now.yearDay) {
            // If it is from a different day than today, show only the date.
            format_flags |= DateUtils.FORMAT_SHOW_DATE;
        } else {
            // Otherwise, if the message is from today, show the time.
            format_flags |= DateUtils.FORMAT_SHOW_TIME;
        }
        // If the caller has asked for full details, make sure to show the date
        // and time no matter what we've determined above (but still make showing
        // the year only happen if it is a different year from today).
        if (fullFormat) {
            format_flags |= (DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_TIME);
        }
        return DateUtils.formatDateTime(context, when, format_flags);
    }

 

转自http://blog.csdn.net/dany1202/article/details/6164322