}



/**

 * 将日期以yyyy-MM-dd HH:mm:ss格式化

 * 

 * @param dateL

 *            日期

 * @return

 */

public static String formatDateTime(long dateL, String formater) {

	SimpleDateFormat sdf = new SimpleDateFormat(formater);

	return sdf.format(new Date(dateL));

}



/**

 * 将日期以yyyy-MM-dd HH:mm:ss格式化

 * 

 * @param dateL

 *            日期

 * @return

 */

public static String formatDateTime(Date date, String formater) {

	SimpleDateFormat sdf = new SimpleDateFormat(formater);

	return sdf.format(date);

}



/**

 * 将日期字符串转成日期

 * 

 * @param strDate

 *            字符串日期

 * @return java.util.date日期类型

 */

public static Date parseDate(String strDate) {

	DateFormat dateFormat = new SimpleDateFormat(DF_YYYY_MM_DD_HH_MM_SS);

	Date returnDate = null;

	try {

		returnDate = dateFormat.parse(strDate);

	} catch (ParseException e) {

		Log.v(TAG, "parseDate failed !");



	}

	return returnDate;



}



/**

 * 获取系统当前日期

 * 

 * @return

 */

public static Date gainCurrentDate() {

	return new Date();

}



/**

 * 验证日期是否比当前日期早

 * 

 * @param target1

 *            比较时间1

 * @param target2

 *            比较时间2

 * @return true 则代表target1比target2晚或等于target2，否则比target2早

 */

public static boolean compareDate(Date target1, Date target2) {

	boolean flag = false;

	try {

		String target1DateTime = ToolDateTime.formatDateTime(target1,

				DF_YYYY_MM_DD_HH_MM_SS);

		String target2DateTime = ToolDateTime.formatDateTime(target2,

				DF_YYYY_MM_DD_HH_MM_SS);

		if (target1DateTime.compareTo(target2DateTime) <= 0) {

			flag = true;

		}

	} catch (Exception e1) {

		System.out.println("比较失败，原因：" + e1.getMessage());

	}

	return flag;

}



/**

 * 对日期进行增加操作

 * 

 * @param target

 *            需要进行运算的日期

 * @param hour

 *            小时

 * @return

 */

public static Date addDateTime(Date target, double hour) {

	if (null == target || hour < 0) {

		return target;

	}



	return new Date(target.getTime() + (long) (hour * 60 * 60 * 1000));

}



/**

 * 对日期进行相减操作

 * 

 * @param target

 *            需要进行运算的日期

 * @param hour

 *            小时

 * @return

 */

public static Date subDateTime(Date target, double hour) {

	if (null == target || hour < 0) {

		return target;

	}



	return new Date(target.getTime() - (long) (hour * 60 * 60 * 1000));

}

}

MainActivity  

package com.yqy.yqy_date;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.widget.TextView;

public class MainActivity extends Activity {

private TextView tv_week, tv_month;



@Override

protected void onCreate(Bundle savedInstanceState) {

	super.onCreate(savedInstanceState);

	setContentView(R.layout.activity_main);

	tv_week = (TextView) findViewById(R.id.tv_week);

	tv_month = (TextView) findViewById(R.id.tv_month);



	Date mDate = new Date();

	Date sDate = null;

	Date eDate = null;

	String sstr = "";

	String estr = "";

	sDate = ToolDateTime.subDateTime(mDate, (mDate.getDay() - 1) * 24);

	for (int i = 0; i < 15; i++) {

		eDate = ToolDateTime.addDateTime(sDate, 6 * 24);

		sstr = ToolDateTime.formatDateTime(sDate,

				ToolDateTime.DF_YYYY_MM_DD);

		estr = ToolDateTime.formatDateTime(eDate,

				ToolDateTime.DF_YYYY_MM_DD);

		tv_week.append(sstr + "~" + estr + "\n");

		sDate = ToolDateTime.addDateTime(eDate, 24);

	}

	

	SimpleDateFormat format = new SimpleDateFormat(ToolDateTime.DF_YYYY_MM_DD);

	// 获取当前月第一天：

	

	String first = "";

	String last = "";

	

	for (int i = 0; i < 10; i++) {

		Calendar c = Calendar.getInstance();

		Calendar ca = Calendar.getInstance();

		c.add(Calendar.MONTH, i);

		c.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天

		first = format.format(c.getTime());



		// 获取当前月最后一天

		ca.add(Calendar.MONTH, i);

		ca.set(Calendar.DAY_OF_MONTH,

				ca.getActualMaximum(Calendar.DAY_OF_MONTH));

		last = format.format(ca.getTime());

		tv_month.append(first+"~"+last+"\n");

	}



}



@Override

public boolean onCreateOptionsMenu(Menu menu) {

	// Inflate the menu; this adds items to the action bar if it is present.

	getMenuInflater().inflate(R.menu.main, menu);

	return true;

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(Menu menu) {

	// Inflate the menu; this adds items to the action bar if it is present.

	getMenuInflater().inflate(R.menu.main, menu);

	return true;

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