Android 之Date常见的方法使用

1. /**
   
   • 描述：Date类型转化为String类型.
   • @param date the dateo
   • @param format 类型如 yyyy-MM-dd HH:mm:ss
     */

    public static String getStringByFormat(Date date, String format) {        SimpleDateFormat mSimpleDateFormat = new SimpleDateFormat(format);        String strDate = null;        try {            strDate = mSimpleDateFormat.format(date);        } catch (Exception e) {            e.printStackTrace();        }        return strDate;    }

1. /**获取当前时间
   
   • pattern 类型 yyyy-MM-dd HH:mm:ss
   • @return
     */

    public static String getCurrentDate(String pattern) {        SimpleDateFormat formatter = new SimpleDateFormat(pattern);        Date curDate = new Date(System.currentTimeMillis());// 获取当前时间        String timestamp = formatter.format(curDate);        return timestamp;    }

1. /**
   
   • 获取当前日期的day天后的日期
   • @param pattern 格式类型
   • @param day 天数
   • @return
     */

    public static String getNewData(String pattern, int day) {        Format format = new SimpleDateFormat(pattern);        long time = 0;        Date today = new Date();        time = (today.getTime() / 1000) + 60 * 60 * 24 * day;        Date newDate = new Date();        newDate.setTime(time * 1000);        String date = format.format(newDate);        return date;    }

/** *  *  * @param DATE1  判断日期是否超过当前日期  超过当前日期为true * @return */    public static boolean compare_date(String DATE1) {        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");        try {            Date dt1 = df.parse(DATE1);            Date dt2 = new Date();            if (dt1.getTime() > dt2.getTime()) {//传入时间小于当前时间  4.7大于4.8                System.out.println("还没到...");                return false;            } else if (dt1.getTime() <= dt2.getTime()) {                System.out.println("超过当期日期...");                return true;            }        } catch (Exception exception) {            exception.printStackTrace();        }        return false;    }

1. /** 描述：比较两个日期的大小
   
   • old 表示之前的时间
   • now 现在的时间
   • @return
     */

    public static String DateCompare(String old,String now){        java.text.DateFormat df=new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        java.util.Calendar c1=java.util.Calendar.getInstance();        java.util.Calendar c2=java.util.Calendar.getInstance();        try {            c1.setTime(df.parse(old));            c2.setTime(df.parse(now));        } catch (Exception e) {            System.out.println("格式不正确");            e.printStackTrace();        }        int result=c1.compareTo(c2);        if(result==0){            return "相等";        }else if(result<0){            return "小于";        }else        return "大于";    }

1. /**描述
   
   • 根据出生日期获得年龄
     
     • data 输入的生日 pattern 转换的类型 如：yyyyMM-dd
   • @return
     */

public static String getAge(String data,String pattern) {        SimpleDateFormat formatter = new SimpleDateFormat(pattern);        Date curDate = new Date();//        String timestamp = formatter.format(curDate);        String brith = data.substring(0, 4);        String now = timestamp.substring(0, 4);        int age = Integer.valueOf(now) - Integer.valueOf(brith);        return age + "岁";    }

1. //通过String类型的日期判断是星期几

 /** *  * 根据String 类型的日期判断是星期几？？ * @param date     String 类型的日期  * @param format   格式类型 * @return */    public static String getWeekOfDate(String date, String format) {        String[] dayofweek = new String[] { "星期日", "星期一", "星期二", "星期三", "星期四",                "星期五", "星期六" };        Calendar c = Calendar.getInstance();        try {            c.setTime((new SimpleDateFormat(format)).parse(date));        } catch (ParseException e) {            e.printStackTrace();        }        return dayofweek[c.get(Calendar.DAY_OF_WEEK) - 1];    }

1.把String类型转换为Date类型

// strTime要转换的string类型的时间，formatType要转换的格式yyyy-MM-dd HH:mm:ss//yyyy年MM月dd日    // HH时mm分ss秒，    // strTime的时间格式必须要与formatType的时间格式相同    public static Date stringToDate(String strTime, String formatType) {        SimpleDateFormat formatter = new SimpleDateFormat(formatType);        Date date = null;        try {            date = formatter.parse(strTime);        } catch (ParseException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return date;    }

/**
*
* 项目中用的这个方法比较仿扣扣评论发送时间
* @param startDate 开始日期
* @param endDate 结束日期
* @return
*/

public static String twoDateDistance(Date startDate, Date endDate) {        if (startDate == null || endDate == null) {            return null;        } else {            long timeLong = endDate.getTime() - startDate.getTime();            if (timeLong < 60 * 1000) {                return "刚刚";            } else if (timeLong < 60 * 60 * 1000) {                timeLong =timeLong/1000/60;                return timeLong+"分钟前";            }else if(timeLong<60*60*24*1000){                timeLong = timeLong/60/60/1000;                 return timeLong+"小时前";            }else if(timeLong<60*60*24*1000*7){                timeLong = timeLong/1000/ 60 / 60 / 24;                return timeLong+"天前";            }else if(timeLong<60*60*24*1000*7*4){                timeLong = timeLong/1000/ 60 / 60 / 24/7;                return timeLong+"周前";            }            else {                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");                 sdf.setTimeZone(TimeZone.getTimeZone("GMT+08:00"));                 return  sdf.format(startDate);            }        }    }

    private static String strYear;    private static String strMonth;    private static String strDay;    private static String sex;/** *  * @param mesg     根据生份证号获取生日 * @return */    public static String SetbirthDay(String mesg){        if(mesg!=null&&mesg!=""){            strYear = mesg.substring(6, 10);            strMonth = mesg.substring(10, 12);            strDay = mesg.substring(12, 14);        }        return strYear+"-"+strMonth+"-"+strDay;    }/** *  * @param mesg  根据省份证号获取性别 * @return */    public static String setSex(String mesg){        if(mesg!=null &&mesg!=""){            sex = mesg.substring(16, 17);        }        if(Integer.parseInt(sex)%2==0){            sex = "女";        }else{            sex ="男";        }        return sex;    }/**     * 根据传入的count数，来获取count天后的日期集合     *      * @param count     表示要获取多少天数     * @param flag   默认false     * @return     */    public static List<String> getDateTimeStr(int count, boolean flag) {        List<String> timestr = new ArrayList<String>();        for (int i = 0; i < count; i++) {            String dateStr = getDateStr(i + 1, flag);            timestr.add(dateStr);        }        return timestr;    }    public static String getDateStr(int mon, boolean flag) {        String time = "";        if (flag) {            if (mon % 2 == 1) {                time = "01 ";                mon = mon / 2 + 1;            } else if (mon % 2 == 0) {                time = "02 ";                mon = mon / 2;            }        }        Calendar cal = Calendar.getInstance();        int _year = cal.get(Calendar.YEAR);        int _month = cal.get(Calendar.MONTH) + 1;        int _day = cal.get(Calendar.DAY_OF_MONTH) + mon;        int hour = cal.get(Calendar.HOUR_OF_DAY);        if (hour > 23) {            _day = _day + 1;        }        int lastday = getLastDay();        if (_day > lastday) {            _month = _month + 1;            _day = _day - lastday;        }        String month = "";        String day = "";        if (_month < 10) {            month = "0" + _month;        } else {            month = _month + "";        }        if (_day < 10) {            day = "0" + _day;        } else {            day = _day + "";        }        if (_month > 12) {            month = "01";            _year = _year + 1;        }        time = time + _year + "-" + month + "-" + day;        return time;    }    public static int getLastDay() {        int lastday;        Calendar d = Calendar.getInstance();        int month = d.get(Calendar.MONTH);        do {            lastday = d.get(Calendar.DAY_OF_MONTH);            d.add(Calendar.DAY_OF_MONTH, 1);        } while (d.get(Calendar.MONTH) == month);        return lastday;    }