Java Date Difference parseParamDate(final String diff)

Description

parse a string to get absolute date

License

Open Source License

Parameter

Parameter	Description
diff	format Yyear.Mmonth.Ddate.hhours.mminutes.sseconds e.g., "Y2016.M11.D10.h12"

Return

Date

Declaration

public static Date parseParamDate(final String diff) throws java.text.ParseException 

Method Source Code

//package com.java2s;
/*//from www .j  av  a2 s .  c  o m
 * *****************************************************************************
 *   Copyright 2014-2016 Spectra Logic Corporation. All Rights Reserved.
 *   Licensed under the Apache License, Version 2.0 (the "License"). You may not use
 *   this file except in compliance with the License. A copy of the License is located at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 *   or in the "license" file accompanying this file.
 *   This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 *   CONDITIONS OF ANY KIND, either express or implied. See the License for the
 *   specific language governing permissions and limitations under the License.
 * ***************************************************************************
 */

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

public class Main {
    /**
     * parse a string to get absolute date
     * @param diff format Yyear.Mmonth.Ddate.hhours.mminutes.sseconds e.g., "Y2016.M11.D10.h12"
     * @return Date
     */
    public static Date parseParamDate(final String diff) throws java.text.ParseException {
        final String dateString = "0000-01-01T00:00:00.000UTC";
        final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZ");
        final char[] dateChars = dateString.toCharArray();

        String timeZone = "UTC";
        final String[] units = diff.split("[.]");
        for (final String unit : units) {
            if (unit.matches("[YMDhms][0-9]+") || unit.matches("[Z]...")) {
                final char unitdesc = unit.charAt(0);
                switch (unitdesc) {
                case 's':
                    // pad to at least two chars and replace two chars at dateChars[19] and left
                    updateDateArray(dateChars, unit.replace("s", "00"), 19, 2);
                    break;
                case 'm':
                    updateDateArray(dateChars, unit.replace("m", "00"), 16, 2);
                    break;
                case 'h':
                    updateDateArray(dateChars, unit.replace("h", "00"), 13, 2);
                    break;
                case 'D':
                    updateDateArray(dateChars, unit.replace("D", "00"), 10, 2);
                    break;
                case 'M':
                    updateDateArray(dateChars, unit.replace("M", "00"), 7, 2);
                    break;
                case 'Y':
                    updateDateArray(dateChars, unit.replace("Y", "0000"), 4, 4);
                    break;
                case 'Z':
                    updateDateArray(dateChars, unit.replace("Z", ""), 26, 3);
                    timeZone = unit.replace("Z", "");
                    break;
                }
            } else {
                throw new ParseException("Cannot process date token: '" + unit + "'", diff.indexOf(unit));
            }
        }
        dateFormat.setTimeZone(TimeZone.getTimeZone(timeZone));
        return dateFormat.parse(new String(dateChars));
    }

    private static void updateDateArray(final char[] chars, final String value, final int rightPos,
            final int fieldWidth) {
        // value is a padded string copy the chars we need from the right
        for (int i = 1; i <= fieldWidth; i++) {
            chars[rightPos - i] = value.charAt(value.length() - i);
        }
    }
}

Related

1. getDiffToString(Date date, int n, String pattern)
2. getScoreDifferenceString(int newNumber, int oldNumber)
3. getSecondDiff(Date d1, Date d2)
4. getTimeDifferenceInSeconds(Date d, Date d2)
5. nextSeconds(Date date, int diff)
6. timeDiff(Calendar date1, Calendar date2)
7. timeDiffHourMinSec(Date start, Date end)