时间的常用操作

最新推荐文章于 2022-04-23 14:27:52 发布

原创最新推荐文章于 2022-04-23 14:27:52 发布 · 759 阅读

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1：获取当前的年月日：

public static String[] getCurrentMonthRequestDate(){

Calendar ca = Calendar.getInstance();

int year = ca.get(Calendar.YEAR);

int month = ca.get(Calendar.MONTH)+1;

int day = ca.get(Calendar.DATE);

String monthString = null;

if(String.valueOf(month).length()==1){

monthString = "0"+month;

}else{

monthString = String.valueOf(month);

}

String dayString = null;

if(String.valueOf(day).length()==1){

dayString = "0"+day;

}else{

dayString = String.valueOf(day);

}

String end = String.valueOf(year)+monthString+dayString;

String start = String.valueOf(year)+monthString+"01";

return new String[]{start,end};

}

2：判断某年某月有几天:

Calendar c= Calendar.getInstance();

c.set(Calendar.YEAR, Integer.parseInt("2013"));

c.set(Calendar.MONTH, Integer.parseInt("1"));

System.out.println(c.getActualMaximum(Calendar.DAY_OF_MONTH));

3:格式化当前时分秒：

private static SimpleDateFormat dateFormat = new SimpleDateFormat(
"MM-dd HH:mm:ss");

String timeCurrent = dateFormat.format(new Date(System.currentTimeMillis()));

4：返回昨天日期

public String getYesteday(){
long today = 0;
String yestedayString ;
SimpleDateFormat oldDateFormat = new SimpleDateFormat("yyyy-MM-dd");
try {
String oldDa = new Date().toLocaleString();

Date oldDate = oldDateFormat.parse(oldDa);
today = oldDate.getTime();
System.out.println(today);
long yesteday = today -(24*60*60*1000); //单位是毫秒

Date lastDate = new Date(yesteday);

5、其他

package com.zftlive.android.tools;

import android.util.Log;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class ToolDateTime {

	/** 日期格式：yyyy-MM-dd HH:mm:ss **/
	public static final String DF_YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";

	/** 日期格式：yyyy-MM-dd HH:mm **/
	public static final String DF_YYYY_MM_DD_HH_MM = "yyyy-MM-dd HH:mm";

	/** 日期格式：yyyy-MM-dd **/
	public static final String DF_YYYY_MM_DD = "yyyy-MM-dd";

	/** 日期格式：HH:mm:ss **/
	public static final String DF_HH_MM_SS = "HH:mm:ss";

	/** 日期格式：HH:mm **/
	public static final String DF_HH_MM = "HH:mm";

	private final static long minute = 60 * 1000;// 1分钟
	private final static long hour = 60 * minute;// 1小时
	private final static long day = 24 * hour;// 1天
	private final static long month = 31 * day;// 月
	private final static long year = 12 * month;// 年

	/** Log输出标识 **/
	private static final String TAG = ToolDateTime.class.getSimpleName();

	/**
	 * 将日期格式化成友好的字符串：几分钟前、几小时前、几天前、几月前、几年前、刚刚
	 * 
	 * @param date
	 * @return
	 */
	public static String formatFriendly(Date date) {
		if (date == null) {
			return null;
		}
		long diff = new Date().getTime() - date.getTime();
		long r = 0;
		if (diff > year) {
			r = (diff / year);
			return r + "年前";
		}
		if (diff > month) {
			r = (diff / month);
			return r + "个月前";
		}
		if (diff > day) {
			r = (diff / day);
			return r + "天前";
		}
		if (diff > hour) {
			r = (diff / hour);
			return r + "个小时前";
		}
		if (diff > minute) {
			r = (diff / minute);
			return r + "分钟前";
		}
		return "刚刚";
	}

	/**
	 * 将日期以yyyy-MM-dd HH:mm:ss格式化
	 * 
	 * @param dateL
	 *            日期
	 * @return
	 */
	public static String formatDateTime(long dateL) {
		SimpleDateFormat sdf = new SimpleDateFormat(DF_YYYY_MM_DD_HH_MM_SS);
		Date date = new Date(dateL);
		return sdf.format(date);
	}

	/**
	 * 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));
	}

}