/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS 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 COPYRIGHT OWNER OR

 * CONTRIBUTORS 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.

 */

// converting b/w JavaScript Date and Java LocalDateTime

// JavaScript Date with current time

var d = new Date();

print(d);

// Java 8 java.time classes used

var Instant = java.time.Instant;

var LocalDateTime = java.time.LocalDateTime;

var ZoneId = java.time.ZoneId;

// Date.prototype.getTime

// getTime() method returns the numeric value corresponding to the time

// for the specified date according to universal time. The value returned

// by the getTime() method is the number of milliseconds since 1 January 1970 00:00:00 UTC.

// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTime

// Java Instant.ofEpochMilli to convert time in milliseconds to Instant object

// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#ofEpochMilli-long-

var instant = Instant.ofEpochMilli(d.getTime());

// Instant to LocalDateTime using LocalDateTime.ofInstant

// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#ofInstant-java.time.Instant-java.time.ZoneId-

var ldt = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());

print(ldt);

// converting a LocalDateTime to JavaScript Date

// convert LocalDateTime to Instant first

// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#atZone-java.time.ZoneId-

var instant = ldt.atZone(ZoneId.systemDefault()).toInstant();

// instant to to epoch milliseconds

// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#toEpochMilli--

// and then to JavaScript Date from time in milliseconds

// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date

var d1 = new Date(instant.toEpochMilli());

print(d1);