DateFormatHelper.java

package com.sogouchat.util;


import java.util.Calendar;

import android.text.format.Time;

public class DateFormatHelper {
	public static final int DAY_S = 24*60*60*1000;
	public static final String YESTERDAY = "昨天";
	public static final String TDBY = "前天";
	public static final String  MONDAY= "周一";
	public static final String  TUESDAY= "周二";
	public static final String  WEDNESDAY= "周三";
	public static final String  THURSDAY= "周四";
	public static final String  FRIDAY= "周五";
	public static final String  SATURDAY= "周六";
	public static final String  SUNDAY= "周日";

	public static final String  LASTMONDAY= "上周一";
	public static final String  LASTTUESDAY= "上周二";
	public static final String  LASTWEDNESDAY= "上周三";
	public static final String  LASTTHURSDAY= "上周四";
	public static final String  LASTFRIDAY= "上周五";
	public static final String  LASTSATURDAY= "上周六";
	public static final String  LASTSUNDAY= "上周日";
	public static String FormatDate(long tm){
		String str = "";
		String strDate="";
		Time tmNow = new Time();
		tmNow.setToNow();
		Time tmItem = new Time();
		tmItem.set(tm);
		String strTime = tmItem.format("%H:%M");
		int nWeekDays = 0;
		//int nWeekDays = 6- tmNow.weekDay+1;
		if (tmNow.weekDay==0) {
			nWeekDays = 7;
		}else {
			nWeekDays = tmNow.weekDay;
		}
		nWeekDays-=1;
		int nLastWeekDays =nWeekDays+7;
		//int nDays = tmNow.yearDay-tmItem.yearDay;
		
		tmNow.hour = 0;
		tmNow.minute = 0;
		tmNow.second = 0;
		tmItem.hour = 0;
		tmItem.minute = 0;
		tmItem.second = 0;

		int nDays = (int) ((tmNow.toMillis(true)-tmItem.toMillis(true))/DAY_S);
		if (tmItem.year != tmNow.year) {
			strDate = tmItem.format("%y-%m-%d");
			str = strDate;
		}else {
			strDate = tmItem.format("%m-%d");
			str = strDate;
		}

		if (2<nDays && nDays<=nWeekDays) {
			switch (tmItem.weekDay) {
			case 1:
				str = MONDAY;
				break;
			case 2:
				str = TUESDAY;
				break;
			case 3:
				str = WEDNESDAY;
				break;
			case 4:
				str = THURSDAY;
				break;
			case 5:
				str = FRIDAY;
				break;
			case 6:
				str = SATURDAY;
				break;
			case 0:
				str = SUNDAY;
				break;
			
			default:
				break;
			}
		}
		if (nWeekDays<nDays && nDays<=nLastWeekDays) {
			switch (tmItem.weekDay) {
			case 1:
				str = LASTMONDAY;
				break;
			case 2:
				str = LASTTUESDAY;
				break;
			case 3:
				str = LASTWEDNESDAY;
				break;
			case 4:
				str = LASTTHURSDAY;
				break;
			case 5:
				str = LASTFRIDAY;
				break;
			case 6:
				str = LASTSATURDAY;
				break;
			case 0:
				str = SUNDAY;
				break;
			default:
				break;
			}
		}
		switch (nDays) {
		case 0:
			str = strTime;
			break;
		case 1:
			str = YESTERDAY+strTime;
			break;
		case 2:
			str = TDBY + strTime;
			break;
		default:
			break;
		}
		
		return str;
	}

}