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Apache OODT Common Utilities Project
/*
* 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.
*/
package org.apache.oodt.commons.date;
//JDK imports
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.SimpleTimeZone;
import java.util.TimeZone;
/**
*
* @author bfoster
* @version $Revision$
*
*/
public class DateUtils {
public static enum FormatType { UTC_FORMAT, LOCAL_FORMAT, TAI_FORMAT };
public static Calendar tai93epoch = new GregorianCalendar(1993, GregorianCalendar.JANUARY, 1);
public static Calendar julianEpoch = new GregorianCalendar(1970, GregorianCalendar.JANUARY, 1);
private static SimpleDateFormat utcFormat = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
private static SimpleDateFormat taiFormat = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss.SSS");
private static SimpleDateFormat localFormat = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss.SSSZ");
static {
utcFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
taiFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
}
static enum IndexType {
DATE(0),
LEAP_SECS(1);
public int index;
IndexType(int index) {
this.index = index;
}
}
//Info taken from ftp://oceans.gsfc.nasa.gov/COMMON/leapsec.dat
static long[][] dateAndLeapSecs = {
{ 0 , 10 },
{ new GregorianCalendar(1972, GregorianCalendar.JULY, 1).getTimeInMillis() , 11 },
{ new GregorianCalendar(1973, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 12 },
{ new GregorianCalendar(1974, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 13 },
{ new GregorianCalendar(1975, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 14 },
{ new GregorianCalendar(1976, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 15 },
{ new GregorianCalendar(1977, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 16 },
{ new GregorianCalendar(1978, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 17 },
{ new GregorianCalendar(1979, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 18 },
{ new GregorianCalendar(1980, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 19 },
{ new GregorianCalendar(1981, GregorianCalendar.JULY, 1).getTimeInMillis() , 20 },
{ new GregorianCalendar(1982, GregorianCalendar.JULY, 1).getTimeInMillis() , 21 },
{ new GregorianCalendar(1983, GregorianCalendar.JULY, 1).getTimeInMillis() , 22 },
{ new GregorianCalendar(1985, GregorianCalendar.JULY, 1).getTimeInMillis() , 23 },
{ new GregorianCalendar(1988, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 24 },
{ new GregorianCalendar(1990, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 25 },
{ new GregorianCalendar(1991, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 26 },
{ new GregorianCalendar(1992, GregorianCalendar.JULY, 1).getTimeInMillis() , 27 },
{ new GregorianCalendar(1993, GregorianCalendar.JULY, 1).getTimeInMillis() , 28 },
{ new GregorianCalendar(1994, GregorianCalendar.JULY, 1).getTimeInMillis() , 29 },
{ new GregorianCalendar(1996, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 30 },
{ new GregorianCalendar(1997, GregorianCalendar.JULY, 1).getTimeInMillis() , 31 },
{ new GregorianCalendar(1999, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 32 },
{ new GregorianCalendar(2006, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 33 },
{ new GregorianCalendar(2009, GregorianCalendar.JANUARY, 1).getTimeInMillis() , 34 },
};
private DateUtils() {}
public static int getLeapSecsForDate(Calendar utcCal) throws Exception {
long timeInMillis = utcCal.getTimeInMillis();
for (int i = dateAndLeapSecs.length - 1; i >= 0; i--) {
if (dateAndLeapSecs[i][IndexType.DATE.index] < timeInMillis)
return (int) dateAndLeapSecs[i][IndexType.LEAP_SECS.index];
}
throw new Exception("No Leap Second found for given date!");
}
public static synchronized Calendar toTai(Calendar cal) throws Exception {
Calendar taiCal = Calendar.getInstance(createTaiTimeZone(getLeapSecsForDate(cal)));
taiCal.setTimeInMillis(cal.getTimeInMillis() + getLeapSecsForDate(cal) * 1000);
return taiCal;
}
private static synchronized Calendar taiToUtc(Calendar taiCal) throws Exception {
Calendar calUtc = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calUtc.setTimeInMillis(taiCal.getTimeInMillis() - taiCal.getTimeZone().getRawOffset());
return calUtc;
}
private static Calendar taiToLocal(Calendar taiCal) throws Exception {
return toLocal(taiToUtc(taiCal));
}
public static synchronized Calendar toLocal(Calendar cal) throws Exception {
if (cal.getTimeZone().getID().equals("TAI")) {
return taiToLocal(cal);
} else {
Calendar calLocal = Calendar.getInstance();
calLocal.setTimeInMillis(cal.getTimeInMillis());
return calLocal;
}
}
public static synchronized Calendar toUtc(Calendar cal) throws Exception {
if (cal.getTimeZone().getID().equals("TAI")) {
return taiToUtc(cal);
} else {
Calendar calUtc = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calUtc.setTimeInMillis(cal.getTimeInMillis());
return calUtc;
}
}
public static Calendar getCurrentUtcTime() throws Exception {
return toUtc(getCurrentLocalTime());
}
public static Calendar getCurrentLocalTime() throws Exception {
return Calendar.getInstance();
}
public static Calendar getCurrentTaiTime() throws Exception {
return toTai(getCurrentUtcTime());
}
public static String toCustomLocalFormat(Calendar cal, String format) {
return new SimpleDateFormat(format).format(cal.getTime());
}
public static String toString(Calendar cal) {
String timeZoneId = cal.getTimeZone().getID();
if (timeZoneId.equals("UTC")) {
return utcFormat.format(cal.getTime());
}else if (timeZoneId.equals("TAI")) {
return taiFormat.format(cal.getTime()) + "-0000"
+ (cal.getTimeZone().getRawOffset() / 1000);
}else {
return localFormat.format(cal.getTime());
}
}
public static synchronized Calendar toLocalCustomFormatCalendar(String calString, String format) throws ParseException {
Calendar localCal = Calendar.getInstance();
localCal.setTime(new SimpleDateFormat(format).parse(calString));
return localCal;
}
public static synchronized Calendar toCalendar(String calString, FormatType formatType)
throws ParseException {
Calendar cal = Calendar.getInstance();
switch (formatType) {
case LOCAL_FORMAT:
cal.setTimeInMillis(localFormat.parse(calString).getTime());
break;
case TAI_FORMAT:
cal.setTimeZone(createTaiTimeZone(Integer.parseInt(calString
.substring(calString.length() - 2))));
calString = calString.substring(0, calString.length() - 5);
cal.setTimeInMillis(taiFormat.parse(calString).getTime());
break;
case UTC_FORMAT:
cal.setTimeZone(TimeZone.getTimeZone("UTC"));
cal.setTimeInMillis(utcFormat.parse(calString).getTime());
break;
default:
cal.setTimeInMillis(localFormat.parse(calString).getTime());
}
return cal;
}
public static double getTimeInSecs(Calendar cal, Calendar epoch) throws Exception {
return getTimeInMillis(cal, epoch) / 1000.0;
}
public static String toString(double seconds) {
return new DecimalFormat("#.000").format(seconds);
}
public static long getTimeInMillis(Calendar cal, Calendar epoch) throws Exception {
long epochDiffInMilli = epoch.getTimeInMillis() - julianEpoch.getTimeInMillis() ;
if (cal.getTimeZone().getID().equals("TAI"))
epochDiffInMilli += getLeapSecsForDate(epoch) * 1000;
long milliseconds = cal.getTimeInMillis();
return milliseconds - epochDiffInMilli;
}
private static TimeZone createTaiTimeZone(int leapSecs) {
return new SimpleTimeZone(leapSecs * 1000, "TAI");
}
public static void main(String[] args) throws Exception {
Calendar curTime = getCurrentLocalTime();
System.out.println("Test Time: " + toString(toCalendar(toString(toTai(toCalendar("2008-01-20T16:29:55.000Z",
FormatType.UTC_FORMAT))), FormatType.TAI_FORMAT)));
System.out.println("Current Local Time: " + toString(curTime) + " " + curTime.getTimeInMillis());
System.out.println("Current UTC Time: " + toString((curTime = toCalendar("2008-01-20T16:29:55.000Z",
FormatType.UTC_FORMAT))) + " " + toString(getTimeInSecs(curTime, tai93epoch)));
System.out.println("Current TAI Time: " + toString((curTime = toTai(toCalendar("2008-01-20T16:29:55.000Z",
FormatType.UTC_FORMAT)))) + " " + toString(getTimeInSecs(curTime, tai93epoch)));
System.out.println("Current UTC Time: " + toString(taiToUtc(curTime)));
}
}