Java Parse Date Pattern YYYY parse(String DateString)

Description

Attempts to parse a date string with various formats including "- ,/, and ."

License

Open Source License

Parameter

Parameter	Description
DateString	a String that represents a data

Return

The Date object corresponding to the DateString

Declaration

public static Date parse(String DateString)

Method Source Code

//package com.java2s;
/*//from   w  ww.ja va  2 s .  c  o  m
 * File:  NxNodeUtils.java 
 *             
 * Copyright (C) 2001, Ruth Mikkelson
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 *
 * Contact : Ruth Mikkelson <mikkelsonr@uwstout.edu>
 *           Department of Mathematics, Statistics and Computer Science
 *           University of Wisconsin-Stout
 *           Menomonie, WI 54751, USA
 *
 * This work was supported by the Intense Pulsed Neutron Source Division
 * of Argonne National Laboratory, Argonne, IL 60439-4845, USA.
 *
 * For further information, see <http://www.pns.anl.gov/ISAW/>
 *
 * Modified:
 *
 * $Log$
 * Revision 1.25  2007/08/26 23:55:44  rmikk
 * Changed package name for the NeXus package
 *
 * Revision 1.24  2005/02/03 08:18:07  kramer
 *
 * Fixed an error in the getISO8601String(Date date) method, the current date
 * was used instead of 'date'.
 *
 * Commented out the section that writes fractions of a second because
 * parseISO8601(String dateString) can't read a ISO8601 string written to a
 * fraction of a second.
 *
 * Revision 1.23  2005/02/03 06:36:50  kramer
 *
 * Added the parseISO8601(String dateString) and getISO8601String(Date date)
 * methods which get a Date from an String written in ISO8601 format and a
 * String written in ISO8601 format from a Date.
 *
 * Revision 1.22  2004/12/23 18:47:05  rmikk
 * Fixed indentation and added lines between code.
 *
 * Revision 1.21  2004/05/14 15:03:27  rmikk
 * Removed unused variables
 *
 * Revision 1.20  2004/03/15 03:36:01  dennis
 * Moved view components, math and utils to new source tree
 * gov.anl.ipns.*
 *
 * Revision 1.19  2004/02/16 02:15:55  bouzekc
 * Removed unused import statements.
 *
 * Revision 1.18  2003/10/19 20:01:57  rmikk
 * Added some documentation
 * Fixed new units for time to be us
 * Fixed error in calculating factor with a numeric prefix
 *
 * Revision 1.17  2003/10/15 03:05:44  bouzekc
 * Fixed javadoc errors.
 *
 * Revision 1.16  2003/09/14 16:35:34  rmikk
 * -incorporated leading factors like 100us for times and
 * lengths
 * -Finished incorporating the time units up to hours.
 *
 * Revision 1.15  2003/06/18 20:32:54  pfpeterson
 * Removed deprecated method.
 *
 * Revision 1.14  2003/06/18 19:38:55  pfpeterson
 * ShowW() now calls method in StringUtil.
 *
 * Revision 1.13  2002/11/27 23:28:17  pfpeterson
 * standardized header
 *
 * Revision 1.12  2002/11/20 16:14:50  pfpeterson
 * reformating
 *
 * Revision 1.11  2002/06/19 16:27:04  rmikk
 * Eliminated commented out code.
 * Eliminated reference to deprecated Date.getYear()
 * Fixed code alignment and spacing
 *
 * Revision 1.10  2002/06/19 15:55:22  rmikk
 * Fixed the order of Date formats so that the seconds, when
 * there, is found
 *
 * Revision 1.9  2002/04/01 20:45:41  rmikk
 * Fixed Date Format exception report in jdk1.4
 * Added some support for the Nexus NXChar type
 *
 * Revision 1.8  2002/02/26 15:46:41  rmikk
 * Fixed the utility Showw routine
 * Added a utility routine to getConversion factors
 *
 */

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Vector;

public class Main {
    static String[] Months = { "JAN", "FEB", "MAR", "APR", "MAY", "JUN",
            "JUL", "AUG", "SEP", "OCT", "NOV", "DEC" };

    /**
     * Attempts to parse a date string with various formats including
     * "- ,/, and ." separators for month,year,day specifiers.
     * @param  DateString  a String that represents a data
     * @return The Date object corresponding to the DateString
     */
    public static Date parse(String DateString) {
        return parse1(DateString, " ");
    }

    /**
     * Attempts to parse a date string with various formats including
     * "- ,/, and ." separators for month,year,day specifiers.
     * @param  DateString  a String that represents a data
     * @return The Date object corresponding to the DateString
     */
    private static Date parse(String DateString, char dateTimeSeparator) {

        if (DateString == null || DateString.length() < 1)
            return null;
        int k = DateString.indexOf(dateTimeSeparator);
        if (k < 0)
            k = DateString.length();

        String[] Splits = SplitUpString(DateString.substring(0, k), " ,/-");
        if (Splits == null || Splits.length < 1)
            return null;
        int monthIndx, yearIndx, dayIndx;
        monthIndx = yearIndx = dayIndx = -1;
        if (!Character.isDigit(Splits[0].charAt(0)))
            monthIndx = 0;
        else if (Splits.length > 2
                && !Character.isDigit(Splits[2].charAt(0)))
            monthIndx = 2;

        if (monthIndx != 0)
            yearIndx = 0;
        else if (monthIndx == 0)
            yearIndx = Splits.length - 1;

        if (yearIndx < 0)
            if (Splits[0].length() >= 3 && monthIndx != 0)
                yearIndx = 0;
            else if (monthIndx != Splits.length - 1
                    && Splits[Splits.length - 1].length() >= 3)
                yearIndx = Splits.length - 1;

        if (Splits.length < 2)
            yearIndx = 0;
        //defaults for yearIndx for 2 digit yearsif no Jan
        if (yearIndx < 0)
            if ("/ ".indexOf(Splits[1].charAt(0)) >= 0)
                yearIndx = Splits.length - 1;
            else
                yearIndx = 0;

        if (yearIndx == 0)
            if (monthIndx == 2)
                dayIndx = 4;
            else if (monthIndx == 4)
                dayIndx = 2;
            else if (Splits.length >= 2)
                if (Splits[1].equals("/") || Splits[1].equals(" ")) {
                    monthIndx = 2;
                    dayIndx = 4;
                } else {

                    monthIndx = 4;
                    dayIndx = 2;

                }
        if (yearIndx > 0)
            if (monthIndx == 0) {
                if (yearIndx > 2)
                    dayIndx = 2;
            } else if (monthIndx > 0) {
                dayIndx = 0;
            } else if (Splits.length >= 2)
                if (Splits[1].equals("/") || Splits[1].equals(" ")) {
                    monthIndx = 0;
                    if (yearIndx > 2)
                        dayIndx = 2;
                } else if (yearIndx > 2) {
                    dayIndx = 0;
                    monthIndx = 2;

                } else {
                    monthIndx = 0;
                }
        int year, day;
        int month;
        try {
            year = Integer.parseInt(Splits[yearIndx]);
        } catch (Exception s) {
            return null;
        }
        if (year < 1000)
            if (year < 30)
                year += 2000;
            else

                year += 1900;

        year = year - 1900;
        try {
            month = Integer.parseInt(Splits[monthIndx]);
            ;

        } catch (Exception s1) {
            month = -1;
            if (monthIndx >= 0 && monthIndx < Splits.length
                    && Splits[monthIndx].length() >= 3) {
                String Mnth = Splits[monthIndx].toUpperCase().substring(0,
                        3);
                for (int i = 0; i < 11 && month < 0; i++)
                    if (Mnth.equals(Months[i]))
                        month = i + 1;
            }

        }
        month = month - 1;
        try {
            day = Integer.parseInt(Splits[dayIndx]);
        } catch (Exception s2) {
            day = 1;
        }

        //------------------ Now do hours minutes and seconds
        String SS = DateString.substring(k);
        if (SS != null)
            SS = SS.trim();
        Splits = SplitUpString(SS, " :");
        int hours, minutes;
        float seconds;
        hours = minutes = -1;
        seconds = -1;
        boolean done = false;
        try {
            hours = Integer.parseInt(Splits[0]);
        } catch (Exception s2) {
            hours = -1;
        }
        if (hours >= 0 && Splits.length > 2 && Splits[1].equals(":"))
            try {
                minutes = Integer.parseInt(Splits[2]);
            } catch (Exception s3) {
                minutes = -1;
            }

        if (minutes >= 0 && Splits.length > 4 && Splits[3].equals(":"))
            try {
                seconds = Float.parseFloat(Splits[4]);
            } catch (Exception s3) {
                seconds = -1;
            }

        int kk = Splits.length - 1;
        if (hours >= 0 && kk - 1 > 0 && Splits[kk - 1] == " ")
            if (Splits[kk].toUpperCase().charAt(0) == 'P')
                hours += 12;
        if (hours < 0)
            hours = 0;
        if (minutes < 0)
            minutes = 0;
        if (seconds < 0)
            seconds = 0;

        return new Date(year, month, day, hours, minutes,
                (int) (seconds + .5));

    }

    /**
     * Attempts to parse a date string with various formats including
     * "- ,/, and ." separators for month,year,day specifiers.
     * @param  DateString  a String that represents a data
     * @return The Date object corresponding to the DateString
     */
    private static Date parse1(String DateString, String dateTimeSeparator) {
        Date Result;
        SimpleDateFormat fmt = new SimpleDateFormat();

        fmt.setLenient(true);
        //yyyy matches with yy
        String Date_formats[] = {
                "yyyy",
                "yyyy-MM",
                "yyyy-MM-dd",
                "yyyy.MM.dd",
                "yy-MMM-dd",//"yyyy-MMM-dd" , "yyyy.MMM.dd" , 
                "yyyy-M-d", "yyyy.M.d", "yy.MM.dd", "yy.N.d", "MM/dd/yyyy",
                "MM/dd/yy", "M/d/yyyy", "M/d/yy", "MMM/dd/yyyy",
                "MMM/d/yyyy", "MMM/dd/yy", "MMM/d/yy", "MMM dd/yyyy",
                "MMM d/yyyy", "MMM dd/yy", "MMM d/yy", "dd-MMM-yyyy",
                "dd/MMM/yyyy", "dd-MMM-yy", "d/MMM/yy", "MMM dd,yy" };

        String Time_formats[] = { "HH:mm:ss", "HH:mm", "hh:mm a", "hh:mma",
                "H:mm:ss", "H:mm", "h:mm a", "h:mma", "H:m:ss", "H:m",
                "h:m a", "h:ma", "" };

        for (int i = 0; i < Date_formats.length; i++) {
            for (int k = 0; k < Time_formats.length; k++) {
                String pattern = Date_formats[i] + dateTimeSeparator
                        + Time_formats[k];

                pattern = pattern.trim();

                try {
                    fmt.applyPattern(pattern);
                    Result = fmt.parse(DateString);
                    if (Result != null) {
                        return Result;
                    }
                } catch (Exception s) {// let it drop on the floor
                }

            }
        }//for i
        return null;

    }

    private static String[] SplitUpString(String toBsplit, String SplitChars) {
        Vector<String> Res = new Vector<String>();
        String CurrentLetters = null;
        if (toBsplit == null || toBsplit.length() < 1)
            return null;
        for (int i = 0; i < toBsplit.length(); i++) {
            char c = toBsplit.charAt(i);
            if (SplitChars.indexOf(c) >= 0) {
                if (CurrentLetters != null)
                    Res.add(CurrentLetters);
                CurrentLetters = null;
                if (Res.size() > 0 && c == ' ' && Res.lastElement() == " ") {

                } else
                    Res.add("" + c);

            } else {
                if (CurrentLetters == null)
                    CurrentLetters = "" + c;
                else
                    CurrentLetters += c;
            }

        }
        if (CurrentLetters != null)
            Res.add(CurrentLetters);
        return Res.toArray(new String[0]);

    }
}

Java Parse Date Pattern YYYY parse(String DateString)

Description

License

Parameter

Return

Declaration

Method Source Code

Related