package com.yc.utils;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.GregorianCalendar;
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/**
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* @author 沈奕洲
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* 2011-11-16
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*/
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public class DateChange {
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private static String strDateSeparator = "-"; //日期分隔符
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/**
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* 格式化日期
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* @param strDate 字符串的日期格式
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* @return 如果格式正确，则返回正确的日期；否则，返回""。
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*/
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public static String formatDate(String strDate)
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{
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String result = "";
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Date date = null;
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try
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{
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SimpleDateFormat sdf = new SimpleDateFormat("yyyy"+strDateSeparator+"MM"+strDateSeparator+"dd");
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date = sdf.parse(strDate);
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result = formatDate(date);
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}
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catch(Exception e)
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{
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//System.out.println("date:" + e.getMessage());
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}
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return result;
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}
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/**
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* 格式化日期
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*
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* @param date Date
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* @return String
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*/
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public static String formatDate(Date date)
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{
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return formatDateByFormat(date,"yyyy"+strDateSeparator+"MM"+strDateSeparator+"dd");
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}
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/**
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* 格式化今天日期
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* @return
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*/
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public static String formatDate()
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{
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Date dToday = new Date();
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return formatDate(dToday);
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}
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public static String formatDateTime(Date date)
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{
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return formatDateByFormat(date,"yyyy"+strDateSeparator+"MM"+strDateSeparator+"dd HH:mm:ss");
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}
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public static String formatShortDateTime(Date date)
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{
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return formatDateByFormat(date,"yyyy"+strDateSeparator+"MM"+strDateSeparator+"dd");
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}
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/**
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* 以指定的格式来格式化日期
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*
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* @param date Date
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* @param format String
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* @return String
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*/
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public static String formatDateByFormat(Date date,String format)
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{
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String result = "";
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if(date != null)
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{
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try
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{
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SimpleDateFormat sdf = new SimpleDateFormat(format);
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result = sdf.format(date);
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}
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catch(Exception ex)
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{
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//System.out.println("date:" + date);
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ex.printStackTrace();
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}
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}
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return result;
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}
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/**
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* 紧缩格式化日期
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*
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* @param date Date
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* @return String
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*/
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public static String formatDateSN(Date date)
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{
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return formatDateByFormat(date,"yyyyMMdd");
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}
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/**
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* 取今天的紧缩格式化日期
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* @return 八位yyyyMMdd格式的字符
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*/
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public static String formatDateSN()
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{
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Date dToday = new Date();
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return formatDateSN(dToday);
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}
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/**
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* 根据字符串解析日期
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*
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* @param strDate String
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* @param division String
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* @return Date
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*/
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public static Date parseFormatDateTime(String strDate)
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{
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Date date = null;
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try
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{
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SimpleDateFormat sdf = new SimpleDateFormat("yyyy"+strDateSeparator+"MM"+strDateSeparator+"dd HH:mm:ss");
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date = sdf.parse(strDate);
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}
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catch(Exception ex)
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{
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ex.printStackTrace();
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}
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return date;
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}
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/**
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* 根据字符串解析日期
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*
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* @param strDate String
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* @param division String
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* @return Date
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*/
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public static String parseFormatDateTime_str(String strDate)
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{
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Date date = null;
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String sDate="";
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try
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{
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SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
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SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy"+strDateSeparator+"MM"+strDateSeparator+"dd HH:mm:ss");
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date = sdf.parse(strDate);
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sDate=sdf1.format(date);
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}
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catch(Exception ex)
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{
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ex.printStackTrace();
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}
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return sDate;
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}
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/**
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* 日期变换函数
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* @param dateformat 日期格式字符串：2005-09-13 14:17:06
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* @param iDay 日期天数 3
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* @return 2005-09-16 14:17:06
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*/
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public static String GetDate(String dateformat,int iDay)
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{
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String strOut="";
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Date date = parseFormatDateTime(dateformat);
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if(date!=null){
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GregorianCalendar worldTour = new GregorianCalendar(date.getYear()+1900,date.getMonth(),date.getDate());
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worldTour.add(Calendar.DATE,iDay);
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Date d = worldTour.getTime();
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strOut = formatDateByFormat(d,"yyyy"+strDateSeparator+"MM"+strDateSeparator+"dd")+" "+"00:00:00";
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//formatDateByFormat(date,"HH:mm:ss");
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}
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return strOut;
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}
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}
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