Java Date Parse convertStringToDate(String dateTime)

Description

Converts a datetime string into and instance of java.util.Date using the date format: yyyy-MM-ddTHH:mm:ss.SSSZ.

License

fedora commons license

Parameter

Parameter	Description
dateTime	A datetime string

Return

Corresponding instance of java.util.Date (returns null if dateTime string argument is empty string or null)

Declaration

public static Date convertStringToDate(String dateTime)

Method Source Code

//package com.java2s;
/* The contents of this file are subject to the license and copyright terms
 * detailed in the license directory at the root of the source tree (also
 * available online at http://fedora-commons.org/license/).
 *///w  w  w  . ja  v a 2  s .  co  m

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

public class Main {
    /**
     * Converts a datetime string into and instance of java.util.Date using the
     * date format: yyyy-MM-ddTHH:mm:ss.SSSZ.
     *
     * @param dateTime
     *        A datetime string
     * @return Corresponding instance of java.util.Date (returns null if
     *         dateTime string argument is empty string or null)
     */
    public static Date convertStringToDate(String dateTime) {
        return parseDateAsUTC(dateTime);
    }

    /**
     * Attempt to parse the given string of form: yyyy-MM-dd[THH:mm:ss[.SSS][Z]]
     * as a Date. If the string is not of that form, return null.
     *
     * @param dateString
     *        the date string to parse
     * @return Date the date, if parse was successful; null otherwise
     */
    public static Date parseDateAsUTC(String dateString) {
        if (dateString == null || dateString.length() == 0) {
            return null;
        }

        SimpleDateFormat formatter = new SimpleDateFormat();
        formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
        int length = dateString.length();
        if (dateString.startsWith("-")) {
            length--;
        }
        if (dateString.endsWith("Z")) {
            if (length == 11) {
                formatter.applyPattern("yyyy-MM-dd'Z'");
            } else if (length == 20) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss'Z'");
            } else if (length == 22) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.S'Z'");
            } else if (length == 23) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SS'Z'");
            } else if (length == 24) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
            }
        } else {
            if (length == 10) {
                formatter.applyPattern("yyyy-MM-dd");
            } else if (length == 19) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss");
            } else if (length == 21) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.S");
            } else if (length == 22) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SS");
            } else if (length == 23) {
                formatter.applyPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");
            } else if (dateString.endsWith("GMT") || dateString.endsWith("UTC")) {
                formatter.applyPattern("EEE, dd MMMM yyyyy HH:mm:ss z");
            }
        }
        try {
            return formatter.parse(dateString);
        } catch (ParseException e) {
            return null;
        }
    }
}