dateconversion.js revision 1311:b8ea01a76cbc 
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30 */
31
32// Converting between #javascript Date and #java8 LocalDateTime with #nashorn
33
34// JavaScript Date with current time
35var d = new Date();
36print(d);
37
38// Java 8 java.time classes used
39var Instant = java.time.Instant;
40var LocalDateTime = java.time.LocalDateTime;
41var ZoneId = java.time.ZoneId;
42
43// Date.prototype.getTime
44
45// getTime() method returns the numeric value corresponding to the time
46// for the specified date according to universal time. The value returned
47// by the getTime() method is the number of milliseconds since 1 January 1970 00:00:00 UTC.
48// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTime
49
50// Java Instant.ofEpochMilli to convert time in milliseconds to Instant object
51// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#ofEpochMilli-long-
52
53var instant = Instant.ofEpochMilli(d.getTime());
54
55// Instant to LocalDateTime using LocalDateTime.ofInstant
56// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#ofInstant-java.time.Instant-java.time.ZoneId-
57
58var ldt = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
59print(ldt);
60
61// converting a LocalDateTime to JavaScript Date
62// convert LocalDateTime to Instant first
63// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#atZone-java.time.ZoneId-
64
65var instant = ldt.atZone(ZoneId.systemDefault()).toInstant();
66
67// instant to to epoch milliseconds
68// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#toEpochMilli--
69// and then to JavaScript Date from time in milliseconds
70// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date
71
72var d1 = new Date(instant.toEpochMilli());
73print(d1);
74