Java TimeUnit Usage millisToDays(long millisLocal)

Description

Return number of days since the unix epoch.

License

Apache License

Declaration

private static int millisToDays(long millisLocal) 

Method Source Code

//package com.java2s;
/*//w w  w.j a  v  a  2s. c  o m
 * Copyright 2017 StreamSets Inc.
 *
 * 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.util.Calendar;

import java.util.TimeZone;
import java.util.concurrent.TimeUnit;

public class Main {
    private static final long MILLIS_PER_DAY = TimeUnit.DAYS.toMillis(1);
    private static TimeZone localTimeZone = Calendar.getInstance().getTimeZone();

    /**
     * Return number of days since the unix epoch.
     *
     * This function has been copied from Apache Hive project.
     */
    private static int millisToDays(long millisLocal) {
        // We assume millisLocal is midnight of some date. What we are basically trying to do
        // here is go from local-midnight to UTC-midnight (or whatever time that happens to be).
        long millisUtc = millisLocal + localTimeZone.getOffset(millisLocal);
        int days;
        if (millisUtc >= 0L) {
            days = (int) (millisUtc / MILLIS_PER_DAY);
        } else {
            days = (int) ((millisUtc - 86399999 /*(MILLIS_PER_DAY - 1)*/) / MILLIS_PER_DAY);
        }
        return days;
    }
}

Related

1. logWatchStop(long start, String... params)
2. mergeResults(List>> futures)
3. millisBetweenNanoTimes(long startNanos, long endNanos)
4. millisecondsToHumanReadable(long duration)
5. millisElapsedSince(long startNanoTime)
6. millisToHMSms(long millis)
7. millisToReadableTime(long milliseconds)
8. millisToString(double millis)
9. millisToString(long millis)