Java BigInteger Calculate getDateOf(final BigInteger fileTime)

Description

Date values in ASF files are given in 100 ns (10 exp -4) steps since first

License

Open Source License

Parameter

Parameter	Description
fileTime	Time in 100ns since 1 jan 1601

Return

Calendar holding the date representation.

Declaration

public static GregorianCalendar getDateOf(final BigInteger fileTime) 

Method Source Code

//package com.java2s;
/*//from  w  ww  . j  av  a2s . c om
 * Entagged Audio Tag library
 * Copyright (c) 2004-2005 Christian Laireiter <liree@web.de>
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *  
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

import java.math.BigInteger;

import java.util.Date;
import java.util.GregorianCalendar;

public class Main {
    public static final long DIFF_BETWEEN_ASF_DATE_AND_JAVA_DATE = 11644470000000l;

    /**
     * Date values in ASF files are given in 100 ns (10 exp -4) steps since first
     *
     * @param fileTime Time in 100ns since 1 jan 1601
     * @return Calendar holding the date representation.
     */
    public static GregorianCalendar getDateOf(final BigInteger fileTime) {
        final GregorianCalendar result = new GregorianCalendar();

        // Divide by 10 to convert from -4 to -3 (millisecs)
        BigInteger time = fileTime.divide(new BigInteger("10"));
        // Construct Date taking into the diff between 1601 and 1970
        Date date = new Date(time.longValue() - DIFF_BETWEEN_ASF_DATE_AND_JAVA_DATE);
        result.setTime(date);
        return result;
    }
}

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