Andorid 日期时间工具类

日期时间工具类
格式化日期时间

 Date currentTime = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateString = formatter.format(currentTime);

解析字符串格式的日期时间

  SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date dateformatter.parse("2017-07-10 12：23：00");
        } catch (ParseException e) {
            return null;
        }

封装 TimeUtil

public class TimeUtil {

   /**
   *一些时间格式
   */
    public final static String FORMAT_TIME = "HH:mm";
    public final static String FORMAT_DATE_TIME = "yyyy-MM-dd HH:mm";
    public final static String FORMAT_DATE_TIME_SECOND = "yyyy-MM-dd HH:mm:ss";
    public final static String FORMAT_MONTH_DAY_TIME = "MM-dd HH:mm";
    public final static String FORMAT_DATE = "yyyy-MM-dd";

    public static String getFormatToday(String dateFormat) {
        Date currentTime = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);
        return formatter.format(currentTime);
    }

    public static Date stringToDate(String dateStr, String dateFormat) {
        SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);
        try {
            return formatter.parse(dateStr);
        } catch (ParseException e) {
            return null;
        }
    }
    public static String dateToString(Date date, String dateFormat) {
        SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);
        return formatter.format(date);
    }

   /**
   *类似QQ/微信 聊天消息的时间
   */
    public static String getChatTime(boolean hasYear, long timesamp) {
        long clearTime = timesamp;
        String result;
        SimpleDateFormat sdf = new SimpleDateFormat("dd");
        Date today = new Date(System.currentTimeMillis());
        Date otherDay = new Date(clearTime);
        int temp = Integer.parseInt(sdf.format(today))
                - Integer.parseInt(sdf.format(otherDay));
        switch (temp) {
            case 0:
                result = "今天 " + getHourAndMin(clearTime);
                break;
            case 1:
                result = "昨天 " + getHourAndMin(clearTime);
                break;
            case 2:
                result = "前天 " + getHourAndMin(clearTime);
                break;
            default:
                result = getTime(hasYear,clearTime);
                break;
        }
        return result;
    }

    private static String getTime(boolean hasYear, long time) {
        String pattern=FORMAT_DATE_TIME;
        if(!hasYear){
            pattern = FORMAT_MONTH_DAY_TIME;
        }
        SimpleDateFormat format = new SimpleDateFormat(pattern);
        return format.format(new Date(time));
    }

    private static String getHourAndMin(long time) {
        SimpleDateFormat format = new SimpleDateFormat(FORMAT_TIME);
        return format.format(new Date(time));
    }

    /**
     * 获取当前日期是星期几

     *
     * @param date
     * @return 当前日期是星期几
     */
    public static String getWeekOfDate(Date date) {
        String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0)
            w = 0;
        return weekDays[w];
    }
    /**
     * 判断某个日期与今天相差 x年x天
     * 如果大于1年，显示x年x天 。否则显示 x天
     * @param timeStamp
     * @return
     */
    public static String getOffsetYearAndDayByTimeStamp(long timeStamp) {
        String result;
        long currentTimeStamp = System.currentTimeMillis();
        long targetTimestamp = timeStamp * 1000L;
        int days = (int) ((currentTimeStamp - targetTimestamp) / ONE_YEAr);
        if (days > 365) {
            //大于1年
            Calendar calendar1 = Calendar.getInstance();
            calendar1.setTimeInMillis(currentTimeStamp);
            Calendar calendar2 = Calendar.getInstance();
            calendar2.setTimeInMillis(targetTimestamp);
            //先判断是否同年
            int y1 = calendar1.get(Calendar.YEAR);
            int y2 = calendar2.get(Calendar.YEAR);
            int d1 = calendar1.get(Calendar.DAY_OF_YEAR);
            int d2 = calendar2.get(Calendar.DAY_OF_YEAR);
            result = (y1 - y2) + "年" + (d1 - d2);
        } else {
            //不满一年，直接返回天数
            result = String.valueOf(days);
        }
        return result;
    }

    /**
     * 描述：计算两个日期所差的天数.
     *
     * @param date1 第一个时间的毫秒表示
     * @param date2 第二个时间的毫秒表示
     * @return int 所差的天数
     */
    public static int getOffsetDay(long date1, long date2) {
        Calendar calendar1 = Calendar.getInstance();
        calendar1.setTimeInMillis(date1);
        Calendar calendar2 = Calendar.getInstance();
        calendar2.setTimeInMillis(date2);
        //先判断是否同年
        int y1 = calendar1.get(Calendar.YEAR);
        int y2 = calendar2.get(Calendar.YEAR);
        int d1 = calendar1.get(Calendar.DAY_OF_YEAR);
        int d2 = calendar2.get(Calendar.DAY_OF_YEAR);
        int maxDays = 0;
        int day = 0;
        if (y1 - y2 > 0) {
            maxDays = calendar2.getActualMaximum(Calendar.DAY_OF_YEAR);
            day = d1 - d2 + maxDays;
        } else if (y1 - y2 < 0) {
            maxDays = calendar1.getActualMaximum(Calendar.DAY_OF_YEAR);
            day = d1 - d2 - maxDays;
        } else {
            day = d1 - d2;
        }
        return day;
    }

    /**
     * 描述：计算两个日期所差的小时数.
     *
     * @param date1 第一个时间的毫秒表示
     * @param date2 第二个时间的毫秒表示
     * @return int 所差的小时数
     */
    public static int getOffsetHour(long date1, long date2) {
        Calendar calendar1 = Calendar.getInstance();
        calendar1.setTimeInMillis(date1);
        Calendar calendar2 = Calendar.getInstance();
        calendar2.setTimeInMillis(date2);
        int h1 = calendar1.get(Calendar.HOUR_OF_DAY);
        int h2 = calendar2.get(Calendar.HOUR_OF_DAY);
        int h = 0;
        int day = getOffsetDay(date1, date2);
        h = h1 - h2 + day * 24;
        return h;
    }

    /**
     * 描述：计算两个日期所差的分钟数.
     *
     * @param date1 第一个时间的毫秒表示
     * @param date2 第二个时间的毫秒表示
     * @return int 所差的分钟数
     */
    public static int getOffsetMinutes(long date1, long date2) {
        Calendar calendar1 = Calendar.getInstance();
        calendar1.setTimeInMillis(date1);
        Calendar calendar2 = Calendar.getInstance();
        calendar2.setTimeInMillis(date2);
        int m1 = calendar1.get(Calendar.MINUTE);
        int m2 = calendar2.get(Calendar.MINUTE);
        int h = getOffsetHour(date1, date2);
        int m = 0;
        m = m1 - m2 + h * 60;
        return m;
    }
  /**
     * 描述：获取本周的某一天.
     *
     * @param format        the format
     * @param calendarField the calendar field
     * @return String String类型日期时间
     */
    private static String getDayOfWeek(String format, int calendarField) {
        String strDate = null;
        try {
            Calendar c = new GregorianCalendar();
            SimpleDateFormat mSimpleDateFormat = new SimpleDateFormat(format);
            int week = c.get(Calendar.DAY_OF_WEEK);
            if (week == calendarField) {
                strDate = mSimpleDateFormat.format(c.getTime());
            } else {
                int offectDay = calendarField - week;
                if (calendarField == Calendar.SUNDAY) {
                    offectDay = 7 - Math.abs(offectDay);
                }
                c.add(Calendar.DATE, offectDay);
                strDate = mSimpleDateFormat.format(c.getTime());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return strDate;
    }
    /**
     * 获取当前日期是星期几
     *
     * @param date
     * @return 当前日期是星期几
     */
    public static String getWeekOfDate(Date date) {
        String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0)
            w = 0;
        return weekDays[w];
    }


    /**
     * 描述：获取本月第一天.
     *
     * @param format the format
     * @return String String类型日期时间
     */
    public static String getFirstDayOfMonth(String format) {
        String strDate = null;
        try {
            Calendar c = new GregorianCalendar();
            SimpleDateFormat mSimpleDateFormat = new SimpleDateFormat(format);
            //当前月的第一天
            c.set(GregorianCalendar.DAY_OF_MONTH, 1);
            strDate = mSimpleDateFormat.format(c.getTime());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return strDate;
    }

    /**
     * 描述：获取本月最后一天.
     *
     * @param format the format
     * @return String String类型日期时间
     */
    public static String getLastDayOfMonth(String format) {
        String strDate = null;
        try {
            Calendar c = new GregorianCalendar();
            SimpleDateFormat mSimpleDateFormat = new SimpleDateFormat(format);
            // 当前月的最后一天
            c.set(Calendar.DATE, 1);
            c.roll(Calendar.DATE, -1);
            strDate = mSimpleDateFormat.format(c.getTime());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return strDate;
    }
}

希望这些总结对大家有所帮助，如果有不正确的地方也可以提出来一起进步。 如果觉的还不错的话，就给个赞哈！