Java Date Convert convertDoubleTimeToDate(Number d)

Description

convert Double Time To Date

License

Open Source License

Parameter

Parameter	Description
d	a value in [0..1[ representing a day

Return

the time value as date in the range from 00:00 - 23:59:59

Declaration

public static Date convertDoubleTimeToDate(Number d) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2010 BSI Business Systems Integration AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:/*from ww w.  j  av  a  2  s. c om*/
 *     BSI Business Systems Integration AG - initial API and implementation
 ******************************************************************************/

import java.util.Calendar;
import java.util.Date;

public class Main {
    public static final long DAY_MILLIS = 24L * 3600L * 1000L;

    /**
     * @param d
     *          a value in [0..1[ representing a day
     * @return the time value as date in the range from 00:00 - 23:59:59
     * @see #convertDateToDoubleTime(Date) inverse function
     */
    public static Date convertDoubleTimeToDate(Number d) {
        if (d == null) {
            return null;
        }
        int m;
        if (d.doubleValue() < 0) {
            m = (int) (((long) (d.doubleValue() * DAY_MILLIS - 0.5)) % DAY_MILLIS);
        } else {
            m = (int) (((long) (d.doubleValue() * DAY_MILLIS + 0.5)) % DAY_MILLIS);
        }

        Calendar c = Calendar.getInstance();
        c.clear();
        c.set(Calendar.MILLISECOND, m % 1000);
        m = m / 1000;
        c.set(Calendar.SECOND, m % 60);
        m = m / 60;
        c.set(Calendar.MINUTE, m % 60);
        m = m / 60;
        c.set(Calendar.HOUR_OF_DAY, m % 24);
        if (m < 0) {
            c.add(Calendar.DAY_OF_MONTH, 1);
        }
        return c.getTime();
    }
}

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