Java Date Format formatDate(Date date)

Description

format Date

License

Open Source License

Declaration

public static boolean formatDate(Date date) 

Method Source Code

//package com.java2s;

import java.text.SimpleDateFormat;

import java.util.Date;

public class Main {
    /**/*from  w w w.j  ava  2s.  co m*/
     * Method formatDate.
     * 
     * @param date
     * @param includeTime
     * @return
     */
    public static String formatDate(Date date, boolean includeTime) {
        if (date != null) {
            if (includeTime)
                return new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a").format(date);
            else
                return new SimpleDateFormat("MM/dd/yyyy").format(date);
        } else
            return null;
    }

    public static boolean formatDate(Date date) {
        boolean isValid = false;
        String formatDate = null;
        try {
            if (date != null) {
                SimpleDateFormat df = new SimpleDateFormat("MM/dd/yyyy");
                formatDate = df.format(date);
                isValid = isValidDate(formatDate);
            }
        } catch (Exception e) {
            isValid = false;
        }
        return isValid;
    }

    /**
     * Method isValidDate. Validates that the given date string contains a valid date part (MM/DD/YYYY).
     * The "parseDate" method allows for a lot of garbage (e.g. "13/32/2000" translates as "02/01/2001")
     * @param dateVal
     * @return boolean
     */
    public static boolean isValidDate(String dateString) {
        // Null conditions
        if (dateString == null)
            return false;

        dateString = dateString.trim();
        if (dateString.length() == 0)
            return false;

        String datePart = null;
        int firstSpacePos = dateString.indexOf(' ');
        if (firstSpacePos > -1) {
            datePart = dateString.substring(0, firstSpacePos);
        } else {
            datePart = dateString;
        }

        // Validate date part: M/D/YYYY or MM/DD/YYYY
        if (datePart.length() < 8)
            return false;
        if (datePart.length() > 10)
            return false;
        int firstSlashPos = datePart.indexOf('/');
        if (firstSlashPos == -1)
            return false;
        int secondSlashPos = datePart.indexOf('/', firstSlashPos + 1);
        if (secondSlashPos == -1)
            return false;
        int month = getIntValue(datePart.substring(0, firstSlashPos), -1);
        if (month < 1 || month > 12)
            return false;
        int day = getIntValue(datePart.substring(firstSlashPos + 1, secondSlashPos), -1);
        if (day < 1 || day > 31)
            return false;
        int year = getIntValue(datePart.substring(secondSlashPos + 1), -1);
        if (year < 1000 || year > 9999)
            return false;

        // Month - day cross-checks
        switch (month) {
        case 4:
        case 6:
        case 9:
        case 11:
            if (day > 30)
                return false;
            break;

        case 2:

            if (day > 29)
                return false;

            if (year % 4 != 0) {
                if (day > 28)
                    return false;
            }

            else if (year % 100 == 0 && year % 400 != 0) {
                if (day > 28)
                    return false;
            }

            break;
        }

        return true;
    }

    /**
     * Method getIntValue. Returns the integer value associated with the passed string. Note Leading and Trailing blanks
     * are removed from the string before converting the value to an integer.
     * 
     * @param str
     *            The String being converted to an integer.
     * @param value
     *            Return this value instead if data when non-numeric character or null object is passed.
     * @return int The converted integer result
     */
    public static final int getIntValue(String str, int value) {
        int retVal = value;
        try {
            // String has a value
            if (str != null) {

                // Remove leading and trailing spaces.
                str = str.trim();

                // Chop decimal point and later
                int decimalPos = str.indexOf('.');
                if (decimalPos > -1)
                    str = str.substring(0, decimalPos);

                // Convert String to integer value
                retVal = Integer.parseInt(str);
            }

        } catch (Exception ignore) {
        }

        return retVal;
    }
}

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