utildatetime.java

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     */
    public static java.util.Date toDate(String dateTime) {
        // dateTime must have one space between the date and time...
        String date = dateTime.substring(0, dateTime.indexOf(" "));
        String time = dateTime.substring(dateTime.indexOf(" ") + 1);

        return toDate(date, time);
    }

    /** Converts a date String and a time String into a Date
     * @param date The date String: MM/DD/YYYY
     * @param time The time String: either HH:MM or HH:MM:SS
     * @return A Date made from the date and time Strings
     */
    public static java.util.Date toDate(String date, String time) {
        if (date == null || time == null) return null;
        String month;
        String day;
        String year;
        String hour;
        String minute;
        String second;

        int dateSlash1 = date.indexOf("/");
        int dateSlash2 = date.lastIndexOf("/");

        if (dateSlash1 <= 0 || dateSlash1 == dateSlash2) return null;
        int timeColon1 = time.indexOf(":");
        int timeColon2 = time.lastIndexOf(":");

        if (timeColon1 <= 0) return null;
        month = date.substring(0, dateSlash1);
        day = date.substring(dateSlash1 + 1, dateSlash2);
        year = date.substring(dateSlash2 + 1);
        hour = time.substring(0, timeColon1);

        if (timeColon1 == timeColon2) {
            minute = time.substring(timeColon1 + 1);
            second = "0";
        } else {
            minute = time.substring(timeColon1 + 1, timeColon2);
            second = time.substring(timeColon2 + 1);
        }

        return toDate(month, day, year, hour, minute, second);
    }

    /** Makes a Date from separate Strings for month, day, year, hour, minute, and second.
     * @param monthStr The month String
     * @param dayStr The day String
     * @param yearStr The year String
     * @param hourStr The hour String
     * @param minuteStr The minute String
     * @param secondStr The second String
     * @return A Date made from separate Strings for month, day, year, hour, minute, and second.
     */
    public static java.util.Date toDate(String monthStr, String dayStr, String yearStr, String hourStr,
        String minuteStr, String secondStr) {
        int month, day, year, hour, minute, second;

        try {
            month = Integer.parseInt(monthStr);
            day = Integer.parseInt(dayStr);
            year = Integer.parseInt(yearStr);
            hour = Integer.parseInt(hourStr);
            minute = Integer.parseInt(minuteStr);
            second = Integer.parseInt(secondStr);
        } catch (Exception e) {
            return null;
        }
        return toDate(month, day, year, hour, minute, second);
    }

    /** Makes a Date from separate ints for month, day, year, hour, minute, and second.
     * @param month The month int
     * @param day The day int
     * @param year The year int
     * @param hour The hour int
     * @param minute The minute int
     * @param second The second int
     * @return A Date made from separate ints for month, day, year, hour, minute, and second.
     */
    public static java.util.Date toDate(int month, int day, int year, int hour, int minute, int second) {
        Calendar calendar = Calendar.getInstance();

        try {
            calendar.set(year, month - 1, day, hour, minute, second);
        } catch (Exception e) {
            return null;
        }
        return new java.util.Date(calendar.getTime().getTime());
    }

    /** Makes a date String in the format MM/DD/YYYY from a Date
     * @param date The Date
     * @return A date String in the format MM/DD/YYYY
     */
    public static String toDateString(java.util.Date date) {
        if (date == null) return "";
        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);
        int month = calendar.get(Calendar.MONTH) + 1;
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int year = calendar.get(Calendar.YEAR);
        String monthStr;
        String dayStr;
        String yearStr;

        if (month < 10) {
            monthStr = "0" + month;
        } else {
            monthStr = "" + month;
        }
        if (day < 10) {
            dayStr = "0" + day;
        } else {
            dayStr = "" + day;
        }
        yearStr = "" + year;
        return monthStr + "/" + dayStr + "/" + yearStr;
    }

    /** Makes a time String in the format HH:MM:SS from a Date. If the seconds are 0, then the output is in HH:MM.
     * @param date The Date
     * @return A time String in the format HH:MM:SS or HH:MM
     */
    public static String toTimeString(java.util.Date date) {
        if (date == null) return "";
        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);
        return (toTimeString(calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), calendar.get(Calendar.SECOND)));
    }

    /** Makes a time String in the format HH:MM:SS from a separate ints for hour, minute, and second. If the seconds are 0, then the output is in HH:MM.
     * @param hour The hour int
     * @param minute The minute int
     * @param second The second int
     * @return A time String in the format HH:MM:SS or HH:MM
     */
    public static String toTimeString(int hour, int minute, int second) {
        String hourStr;
        String minuteStr;
        String secondStr;

        if (hour < 10) {
            hourStr = "0" + hour;
        } else {
            hourStr = "" + hour;
        }
        if (minute < 10) {
            minuteStr = "0" + minute;
        } else {
            minuteStr = "" + minute;
        }
        if (second < 10) {
            secondStr = "0" + second;
        } else {
            secondStr = "" + second;
        }
        if (second == 0)
            return hourStr + ":" + minuteStr;
        else
            return hourStr + ":" + minuteStr + ":" + secondStr;
    }

    /** Makes a combined data and time string in the format "MM/DD/YYYY HH:MM:SS" from a Date. If the seconds are 0 they are left off.
     * @param date The Date
     * @return A combined data and time string in the format "MM/DD/YYYY HH:MM:SS" where the seconds are left off if they are 0.
     */
    public static String toDateTimeString(java.util.Date date) {
        if (date == null) return "";
        String dateString = toDateString(date);
        String timeString = toTimeString(date);

        if (dateString != null && timeString != null)
            return dateString + " " + timeString;
        else
            return "";
    }

    /** Makes a Timestamp for the beginning of the month
     * @return A Timestamp of the beginning of the month
     */
    public static java.sql.Timestamp monthBegin() {
        Calendar mth = Calendar.getInstance();

        mth.set(Calendar.DAY_OF_MONTH, 1);
        mth.set(Calendar.HOUR_OF_DAY, 0);
        mth.set(Calendar.MINUTE, 0);
        mth.set(Calendar.SECOND, 0);
        mth.set(Calendar.AM_PM, Calendar.AM);
        return new java.sql.Timestamp(mth.getTime().getTime());
    }

    /**
     * datetime is the String of System.currentTimeMillis()
     * 返回标准中国（缺省）的时间格式
     *
     */
    public static String getDateTimeDisp(String datetime) {
      if ((datetime == null) || (datetime.equals("")))
        return "";

      DateFormat formatter
          = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);
      long datel = Long.parseLong(datetime);
      return formatter.format(new Date(datel));

    }
}