Set the time component of the calendar to midnight. - Java java.util

Java examples for java.util:Calendar Calculation

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Description

Set the time component of the calendar to midnight.

Demo Code

/*/*from   ww w .  j  a va 2  s  . co  m*/
 * = License =
 * 
 * McLean Computer Services Open Source Software License
 * 
 * (Looks like the BSD license, but less restrictive.)
 * 
 * Copyright (c) 2006-2011 Evan McLean. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 2. Neither the names "Evan McLean", "McLean Computer Services", "EvLib" nor
 * the names of any contributors may be used to endorse or promote products
 * derived from this software without prior written permission.
 * 
 * 3. Products derived from this software may not be called "Evlib", nor may
 * "Evlib" appear in their name, without prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
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 * = License =
 */
//package com.java2s;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class Main {
    public static void main(String[] argv) throws Exception {
        Calendar cal = Calendar.getInstance();
        setMidnight(cal);
    }

    /**
     * Set the time component of the calendar to midnight.
     * 
     * @param cal
     */
    public static void setMidnight(final Calendar cal) {
        cal.set(Calendar.MILLISECOND, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.HOUR_OF_DAY, 0);
    }

    /**
     * Set the time component of the date to midnight, using the local time zone.
     * 
     * @param dt
     */
    public static void setMidnight(final Date dt) {
        final Calendar cal = Calendar.getInstance();
        cal.setTime(dt);
        setMidnight(cal);
        dt.setTime(cal.getTimeInMillis());
    }

    /**
     * Set the time component of the date to midnight.
     * 
     * @param dt
     * @param tz
     */
    public static void setMidnight(final Date dt, final TimeZone tz) {
        final Calendar cal = Calendar.getInstance(tz);
        cal.setTime(dt);
        setMidnight(cal);
        dt.setTime(cal.getTimeInMillis());
    }
}

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