74 lines
3.2 KiB
JavaScript
74 lines
3.2 KiB
JavaScript
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// converting b/w JavaScript Date and Java LocalDateTime
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// JavaScript Date with current time
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var d = new Date();
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print(d);
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// Java 8 java.time classes used
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var Instant = java.time.Instant;
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var LocalDateTime = java.time.LocalDateTime;
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var ZoneId = java.time.ZoneId;
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// Date.prototype.getTime
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// getTime() method returns the numeric value corresponding to the time
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// for the specified date according to universal time. The value returned
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// by the getTime() method is the number of milliseconds since 1 January 1970 00:00:00 UTC.
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// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTime
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// Java Instant.ofEpochMilli to convert time in milliseconds to Instant object
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// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#ofEpochMilli-long-
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var instant = Instant.ofEpochMilli(d.getTime());
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// Instant to LocalDateTime using LocalDateTime.ofInstant
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// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#ofInstant-java.time.Instant-java.time.ZoneId-
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var ldt = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
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print(ldt);
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// converting a LocalDateTime to JavaScript Date
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// convert LocalDateTime to Instant first
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// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#atZone-java.time.ZoneId-
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var instant = ldt.atZone(ZoneId.systemDefault()).toInstant();
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// instant to to epoch milliseconds
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// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#toEpochMilli--
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// and then to JavaScript Date from time in milliseconds
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// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date
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var d1 = new Date(instant.toEpochMilli());
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print(d1);
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