Here you can find the source of format(long epochMilliSecond)
public static String format(long epochMilliSecond)
//package com.java2s; /*/*from w w w . j a v a 2 s. com*/ * Copyright 2017 Organizations participating in ISAAC, ISAAC's KOMET, and SOLOR development include the US Veterans Health Administration, OSHERA, and the Health Services Platform Consortium.. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.time.Instant; import java.time.ZoneOffset; import java.time.format.DateTimeFormatter; public class Main { private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"); public static String format(long epochMilliSecond) { return FORMATTER.format(Instant.ofEpochMilli(epochMilliSecond).atZone(ZoneOffset.UTC)); } public static String format(Instant instant) { return FORMATTER.format(instant); } }