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// Converting between #javascript Date and #java8 LocalDateTime with #nashorn

// 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);