Here you can find the source of convertToEpochMillis(String logTimestamp, DateTimeFormatter logTimeFormat)
private static long convertToEpochMillis(String logTimestamp, DateTimeFormatter logTimeFormat)
//package com.java2s; /**// w ww . j av a 2s.c om * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.ZonedDateTime; import java.time.format.DateTimeFormatter; public class Main { private static long convertToEpochMillis(String logTimestamp, DateTimeFormatter logTimeFormat) { ZonedDateTime timestamp = ZonedDateTime.parse(logTimestamp, logTimeFormat); return timestamp.toInstant().toEpochMilli(); } }