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Solve: Format Date Method

Created By: Geoffrey Challen
/ Version: 2020.10.0

Complete the method below formatDate. It should accept a positive long representing milliseconds since 1970 and return a String containing the ISO-8601 representation of this time. Here is one example for a recent timestamp: given 1602106609897 your function should return "2020-10-07T21:36:49.897Z".

Do not overthink this. The solution we are after is a single line of code. We suggest that you explore the various built-in Java libraries for working with dates and times.

We have provided starter code so that you can tell where the import statements should go. Ignore the public class Question stuff, since we haven't covered that yet.

// Import statements here
public class Question {
String formatDate(long millis) {
return "";

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