Java BigInteger Calculate getDateOf(BigInteger fileTime)

Description

Since date values in asf files are given in 100 ns steps since first january of 1601 a little conversion must be done.

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(BigInteger fileTime) 

Method Source Code

//package com.java2s;
/*/*from w  w w.  j  av  a  2 s  . com*/
 * 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.Calendar;
import java.util.GregorianCalendar;

public class Main {
    /**
     * Since date values in asf files are given in 100 ns steps since first
     * january of 1601 a little conversion must be done. <br>
     * This method converts a date given in described manner to a calendar.
     * 
     * @param fileTime Time in 100ns since 1 jan 1601
     * @return Calendar holding the date representation.
     */
    public static GregorianCalendar getDateOf(BigInteger fileTime) {
        GregorianCalendar result = new GregorianCalendar(1601, 0, 1);
        // lose anything beyond milliseconds, because calendar can't handle
        // less value
        fileTime = fileTime.divide(new BigInteger("10000")); //$NON-NLS-1$
        BigInteger maxInt = new BigInteger(String.valueOf(Integer.MAX_VALUE));
        while (fileTime.compareTo(maxInt) > 0) {
            result.add(Calendar.MILLISECOND, Integer.MAX_VALUE);
            fileTime = fileTime.subtract(maxInt);
        }
        result.add(Calendar.MILLISECOND, fileTime.intValue());
        return result;
    }
}

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