TimeUtil.java Source code

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Here is the source code for TimeUtil.java

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/**
 * Copyright (c) 2006 Richard Rodgers
 *
 * 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.
 */

//package com.monad.homerun.util;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * TimeUtil is a utility class with static methods to convert times in various
 * formats into other formats
 */

public class TimeUtil {
    private static final int MINS_PER_DAY = 60 * 24;
    private static final long MS_PER_DAY = 1000 * 60 * MINS_PER_DAY;

    private static final int SEC = 1000;
    private static final int MIN = SEC * 60;
    private static final int HOUR = MIN * 60;
    private static final int DAY = HOUR * 24;
    private static final long WEEK = DAY * 7;
    private static final long YEAR = WEEK * 52;

    private static final long[] buckets = { YEAR, WEEK, DAY, HOUR, MIN, SEC };
    private static final String[] bucketNames = { "year", "week", "day", "hour", "minute", "second" };

    private static GregorianCalendar statFmtCal = new GregorianCalendar();

    private static final String ts24Pat = "H:mm:ss yy-MM-dd";

    // convert date in minute of the week format into millisecond format
    public static long dateFormat(short weekMins) {
        long dateMillis = System.currentTimeMillis();

        synchronized (statFmtCal) {
            statFmtCal.setTime(new Date(dateMillis));

            // get the day of the week
            int nowDay = statFmtCal.get(Calendar.DAY_OF_WEEK) - 1;
            // get day of the week of stat time
            int statDay = weekMins / 1440;

            if (nowDay > statDay) {
                dateMillis -= (nowDay - statDay) * 1440 * 60 * 1000;
            } else if (nowDay < statDay) {
                dateMillis += (statDay - nowDay) * 1440 * 60 * 1000;
            }

            // now get the hour of the day
            int nowHour = statFmtCal.get(Calendar.HOUR_OF_DAY);
            int statHour = (weekMins % 1440) / 60;

            if (nowHour > statHour) {
                dateMillis -= (nowHour - statHour) * 60 * 60 * 1000;
            } else if (nowHour < statHour) {
                dateMillis += (statHour - nowHour) * 60 * 60 * 1000;
            }

            // finally minutes
            int nowMins = statFmtCal.get(Calendar.MINUTE);
            int statMins = (weekMins % 1440) % 60;

            if (nowMins > statMins) {
                dateMillis -= (nowMins - statMins) * 60 * 1000;
            } else if (nowMins < statMins) {
                dateMillis += (statMins - nowMins) * 60 * 1000;
            }
        }

        return dateMillis;
    }
}