Here you can find the source of parse(final DateTimeFormatter formatter, final String value, final ZoneId zoneId)
private static ZonedDateTime parse(final DateTimeFormatter formatter, final String value, final ZoneId zoneId)
//package com.java2s; /*// w w w .j ava2s .c o m * Copyright 2017 Crown Copyright * * 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.LocalDate; import java.time.LocalDateTime; import java.time.ZoneId; import java.time.ZonedDateTime; import java.time.format.DateTimeFormatter; import java.time.temporal.TemporalAccessor; public class Main { private static ZonedDateTime parse(final DateTimeFormatter formatter, final String value, final ZoneId zoneId) { final TemporalAccessor temporalAccessor = formatter.parseBest(value, ZonedDateTime::from, LocalDateTime::from, LocalDate::from); if (temporalAccessor instanceof ZonedDateTime) { return ((ZonedDateTime) temporalAccessor).withZoneSameInstant(zoneId); } if (temporalAccessor instanceof LocalDateTime) { return ((LocalDateTime) temporalAccessor).atZone(zoneId); } return ((LocalDate) temporalAccessor).atStartOfDay(zoneId); } }