package com.why.project.datetimehelperdemo.utils;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.Locale;import java.util.TimeZone;/** * Create By HaiyuKing * Used 实现日期和字符串之间的转换以及日期的相关操作 * 注意 new SimpleDateFormat的构造函数中必须含有Locale.CHINA或者Locale.getDefault() *  SimpleDateFormat format = new SimpleDateFormat(parse,Locale.CHINA);//区域设置为中文 *  SimpleDateFormat format = new SimpleDateFormat(parse,Locale.getDefault());//区域设置为本地 *  解决黄色感叹号：http://www.blogchen.com/archives/392.html */public class DateTimeHelper {    public static final String FORMAT_24 = "yyyy-MM-dd HH:mm:ss";//24小时制    public static final String FORMAT_12 = "yyyy-MM-dd hh:mm:ss";//12小时制    public static final String FORMAT_TEXT_24 = "yyyy年MM月dd日 HH时mm分ss秒";    public static final String FORMAT_TEXT_12 = "yyyy年MM月dd日 hh时mm分ss秒";    public static final String FORMAT_DAY = "yyyy-MM-dd";//显示年月日    /**     * 将未指定格式的字符串转换成日期类型     * @param date - 20151123 或者 2015/11/23 或者2015-11-23     * @return Mon Nov 23 00:00:00 GMT+08:00 2015     */    public static Date parseStringToDate(String date) throws ParseException {        Date result = null;        String parse = date;        parse = parse.replaceFirst("^[0-9]{4}([^0-9]?)", "yyyy$1");        parse = parse.replaceFirst("^[0-9]{2}([^0-9]?)", "yy$1");        parse = parse.replaceFirst("([^0-9]?)[0-9]{1,2}([^0-9]?)", "$1MM$2");        parse = parse.replaceFirst("([^0-9]?)[0-9]{1,2}( ?)", "$1dd$2");        parse = parse.replaceFirst("( )[0-9]{1,2}([^0-9]?)", "$1HH$2");        parse = parse.replaceFirst("([^0-9]?)[0-9]{1,2}([^0-9]?)", "$1mm$2");        parse = parse.replaceFirst("([^0-9]?)[0-9]{1,2}([^0-9]?)", "$1ss$2");        SimpleDateFormat format = new SimpleDateFormat(parse,Locale.CHINA);        result = format.parse(date);        return result;    }    /**     * 将日期以指定格式输出     * @param date - new Date()     * @param format - "yyyy-MM-dd"     * @return 2015-11-23     */    public static String formatToString(Date date, String format) {        try {            SimpleDateFormat sdf = new SimpleDateFormat(format,Locale.CHINA);            return sdf.format(date);        } catch (Exception e) {            e.printStackTrace();        }        return "";    }    /**     * 将日期格式的字符串以指定格式输出     * @param date - "2015/11/23"     * @param format - "yyyy-MM-dd"     * @return 2015-11-23     */    public static String formatToString(String date, String format) {        try {            Date dt = DateTimeHelper.parseStringToDate(date);            SimpleDateFormat sdf = new SimpleDateFormat(format,Locale.CHINA);            return sdf.format(dt);        } catch (ParseException e) {            e.printStackTrace();        }        return date;    }    /**     * 将时间戳转化为固定格式的日期字符串 （yyyy-MM-dd HH:mm:ss）     * @param time - new Date().getTime()+""     * @return 2015-11-23 14:05:20     */    public static String getStrTime(String time) {        if (time.trim().equals("") || time == null)            return "";        String strTime = null;        time = time.substring(0, 10);        SimpleDateFormat mFormat = new SimpleDateFormat(FORMAT_24,Locale.CHINA);        long ltime = Long.valueOf(time);        strTime = mFormat.format(new Date(ltime * 1000L));        return strTime;    }    /**     * 将时间戳转化为指定格式日期的字符串     * @param time - new Date().getTime()+""     * @param format - "yyyy年MM月dd日 hh时mm分ss秒"     * @return 2015年11月23日 02时05分36秒     */    public static String getStrTime(String time, String format) {        if (time.trim().equals("") || time == null || time.equals("null"))            return "";        String strTime = null;        time = time.substring(0, 10);        SimpleDateFormat mFormat = new SimpleDateFormat(format, Locale.CHINA);        long ltime = Long.valueOf(time);        strTime = mFormat.format(new Date(ltime * 1000L));        return strTime;    }        /**     * 当前时间提前一个月     * @return 2015-10-23     */    public static String getPerMonthDate(){        Date date = new Date();//当前日期        SimpleDateFormat sdf = new SimpleDateFormat(FORMAT_DAY,Locale.CHINA);//格式化对象        Calendar calendar = Calendar.getInstance();//日历对象        calendar.setTime(date);                        //设置当前日期        calendar.add(Calendar.MONTH, -1);           //月份减一        return sdf.format(calendar.getTime());    }        /**     * 当前时间延后一个月     * @return 2015-12-23     */    public static String getLastMonthDate(){        Date date = new Date();//当前日期        SimpleDateFormat sdf = new SimpleDateFormat(FORMAT_DAY,Locale.CHINA);//格式化对象        Calendar calendar = Calendar.getInstance();//日历对象        calendar.setTime(date);                        //设置当前日期        calendar.add(Calendar.MONTH, 1);           //月份加一        return sdf.format(calendar.getTime());    }        /**     * 计算时间差（单位：天）     * @param startDate - "2015-11-23"     * @param endDate - "2015-12-20"     * @return 27（天）     */    public static String getTimeDifferenceDate(String startDate, String endDate) {        try {            Date d1 = parseStringToDate(endDate);            Date d2 = parseStringToDate(startDate);            long diff = d1.getTime() - d2.getTime();            long days = diff / (1000 * 60 * 60 * 24);            return days + "";        } catch (Exception e) {        }        return "";    }    /**     * 计算两个日期型的时间相差多少时间     * @param startDate - DateTimeHelper.parseStringToDate("2015-11-23")     * @param endDate - DateTimeHelper.parseStringToDate("2015-12-20")     * @return 3周前     */    public static String twoDateDistance(Date startDate, Date endDate) {        if (startDate == null || endDate == null) {            return null;        }        long timeLong = endDate.getTime() - startDate.getTime();        if (timeLong < 60 * 1000l)            return timeLong / 1000 + "秒前";        else if (timeLong < 60 * 60 * 1000l) {            timeLong = timeLong / 1000 / 60;            return timeLong + "分钟前";        } else if (timeLong < 24 * 60 * 60 * 1000l) {            timeLong = timeLong / 60 / 60 / 1000;            return timeLong + "小时前";        } else if (timeLong < 7 * 24 * 60 * 60 * 1000l) {            timeLong = timeLong / 1000 / 60 / 60 / 24;            return timeLong + "天前";        } else if (timeLong < 4 * 7 * 24 * 60 * 60 * 1000l) {            timeLong = timeLong / 1000 / 60 / 60 / 24 / 7;            return timeLong + "周前";        } else {            SimpleDateFormat sdf = new SimpleDateFormat(FORMAT_DAY,Locale.CHINA);            sdf.setTimeZone(TimeZone.getTimeZone("GMT+08:00"));            return sdf.format(startDate);        }    }    /**     * 判断两个日期的大小     *      * @param DATE1 -- "2015-11-23     * @param DATE2 --"2015-12-20"     * @return true 默认第一个比第二个时间小，所以如果第一个大于第二个，返回false     */    public static boolean compare_date(String DATE1, String DATE2) {        //DateFormat df = new SimpleDateFormat();                //getDateInstance方法——获取日期格式器 2015-11-23        //getDateTimeInstance方法——获取日期/时间格式器  2015-11-23 09:37:50        //getInstance方法用于获取为日期和时间使用SHORT风格的默认日期/时间格式器        DateFormat df = DateFormat.getDateInstance();        try {            Date dt1 = parseStringToDate(DATE1);            Date dt2 = parseStringToDate(DATE2);            if (dt1.getTime() >= dt2.getTime()) {                return false;            } else if (dt1.getTime() < dt2.getTime()) {                return true;            }        } catch (Exception exception) {            exception.printStackTrace();        }        return false;    }        /**     * 将时间time字符串转化为Date对象     * @param strTime - 1448208000000     * @return Mon Nov 23 00:00:00 GMT+08:00 2015     */    public static Date parseFormatTimeToDate(String strTime) {                Date date = new Date();        try{            date.setTime(Long.parseLong(strTime));        }        catch(NumberFormatException nfe){            nfe.printStackTrace();        }                return date;    }        /**     * 获取格式化后Date字符串的Time值     * @param dateStr 20151123 或者 2015/11/23 或者2015-11-23     * @return 1448208000000     * */    public static long getParseDateTime(String dateStr){        long daterTime = 0;        try {            Date dt1 = parseStringToDate(dateStr);            daterTime = dt1.getTime();        } catch (Exception exception) {            exception.printStackTrace();        }        return daterTime;    }        /**     * 当前时间延后一个星期     * @param startDate 2016-03-16     * @return 2015-03-23     */    public static String getLastWeekDate(String startDate){        String endDate = "";        try {            Date date = parseStringToDate(startDate);            long startTime = date.getTime();            long endTime = startTime + 7 * 24 * 60 * 60 * 1000;            endDate = getStrTime(endTime+"",FORMAT_DAY);        } catch (Exception e) {        }        return endDate;    }        /**     * 判断是否同一天【一般用来判断是否是今天】     * @param date  new Date()     * @param sameDate  DateTimeHelper.parseStringToDate("2015-12-20")     * @return boolean false     */    public static boolean isSameDay(Date date, Date sameDate) {        if (null == date || null == sameDate) {            return false;        }        Calendar nowCalendar = Calendar.getInstance();        nowCalendar.setTime(sameDate);        Calendar dateCalendar = Calendar.getInstance();        dateCalendar.setTime(date);        if (nowCalendar.get(Calendar.YEAR) == dateCalendar.get(Calendar.YEAR)                && nowCalendar.get(Calendar.MONTH) == dateCalendar.get(Calendar.MONTH)                && nowCalendar.get(Calendar.DATE) == dateCalendar.get(Calendar.DATE)) {            return true;        }        return false;    }}