Here you can find the source of toEpochMilli(Instant _instant)
public static final long toEpochMilli(Instant _instant)
//package com.java2s; //License from project: Open Source License import java.time.Instant; public class Main { /**//w w w .j a v a 2 s .co m * Get Instant as elapsed millisecond since Epoch origin <br> * */ public static final long toEpochMilli(Instant _instant) { return _instant.toEpochMilli(); } }