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package org.uic.barcode.ticket.api.utils;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
public class DateTimeUtils {
public static Long getDateDifference(Date issuingDate, Date localDate) {
if (issuingDate == null || localDate == null) return null;
Calendar startCal = Calendar.getInstance();
startCal.clear();
startCal.setTime(issuingDate);
startCal.setTimeZone(TimeZone.getTimeZone("UTC"));
startCal.set(Calendar.HOUR_OF_DAY, 0);
startCal.set(Calendar.MINUTE, 0);
startCal.set(Calendar.SECOND, 0);
startCal.set(Calendar.MILLISECOND, 0);
Date start = startCal.getTime();
Calendar endCal = Calendar.getInstance();
endCal.clear();
endCal.setTime(localDate);
endCal.setTimeZone(TimeZone.getTimeZone("UTC"));
endCal.set(Calendar.HOUR_OF_DAY, 0);
endCal.set(Calendar.MINUTE, 0);
endCal.set(Calendar.SECOND, 0);
endCal.set(Calendar.MILLISECOND, 0);
Date end = endCal.getTime();
long diff = TimeUnit.DAYS.convert(end.getTime() - start.getTime(), TimeUnit.MILLISECONDS );
//long diff = localDate.getTime() - issuingDate.getTime();
//long dayDiff = TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS);
return new Long(diff);
}
public static Long getDateDifferenceLocal(Date referenceDate, Date localDate) {
if (referenceDate == null || localDate == null) return null;
Calendar issuingCal = Calendar.getInstance();
issuingCal.clear();
issuingCal.setTime(referenceDate);
issuingCal.set(Calendar.HOUR_OF_DAY, 0);
issuingCal.set(Calendar.MINUTE, 0);
issuingCal.set(Calendar.SECOND, 0);
issuingCal.set(Calendar.MILLISECOND, 0);
Calendar fromCal = Calendar.getInstance();
fromCal.clear();
fromCal.setTime(localDate);
fromCal.set(Calendar.HOUR_OF_DAY, 0);
fromCal.set(Calendar.MINUTE, 0);
fromCal.set(Calendar.SECOND, 0);
fromCal.set(Calendar.MILLISECOND, 0);
long diff = localDate.getTime() - referenceDate.getTime();
long dayDiff = TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS);
return new Long(dayDiff);
}
public static Date getLocalDateFromDifference(Date issuingDate, int diff , Long time ) {
if (issuingDate == null) return null;
Calendar cal = Calendar.getInstance();
cal.clear();
cal.setTime(issuingDate);
cal.add(Calendar.DAY_OF_YEAR, diff);
if (time != null) {
int hours = time.intValue() / 60;
int minutes = time.intValue() - hours * 60;
cal.set(Calendar.HOUR_OF_DAY, hours);
cal.set(Calendar.MINUTE,minutes);
}
return cal.getTime();
}
public static void setTime(Calendar cal, Long time){
if (time != null) {
int hours = time.intValue() / 60;
int minutes = time.intValue() - hours * 60;
cal.set(Calendar.HOUR_OF_DAY, hours);
cal.set(Calendar.MINUTE,minutes);
}
}
public static Long getTime (Calendar cal) {
if (cal == null ||
!cal.isSet(Calendar.HOUR_OF_DAY) ||
!cal.isSet(Calendar.MINUTE) ) {
return null;
}
int time = cal.get(Calendar.HOUR_OF_DAY) * 60 + cal.get(Calendar.MINUTE);
return new Long (time );
}
public static Long getTime (Date date) {
Calendar cal = Calendar.getInstance();
cal.clear();
cal.setTime(date);
int time = cal.get(Calendar.HOUR_OF_DAY) * 60 + cal.get(Calendar.MINUTE);
return new Long (time );
}
public static Date getDate(Date issuingDate, Long date, Long time){
if (issuingDate == null) return null;
if (date == null) {
date = 0L;
}
Calendar issuingCal = Calendar.getInstance();
issuingCal.clear();
issuingCal.setTime(issuingDate);
Calendar cal = Calendar.getInstance();
cal.clear();
cal.set(Calendar.YEAR,issuingCal.get(Calendar.YEAR) );
cal.set(Calendar.DAY_OF_YEAR,issuingCal.get(Calendar.DAY_OF_YEAR) );
cal.add(Calendar.DAY_OF_YEAR, date.intValue());
if (time == null) {
DateTimeUtils.setTime(cal,0L);
} else {
DateTimeUtils.setTime(cal,time);
}
return cal.getTime();
}
/**
* Gets the UTC offset.
*
* @param date and time of the issuing date
* @param date and time of the departure
* @return the UTC offset in multiples of 15 minutes
* the offset needs to be added to local time to get the UTC time (UTC = local + offset)
*/
public static Long getUTCoffset(Date local) {
Calendar cal = Calendar.getInstance();
cal.clear();
cal.setTime(local);
/*
* Returns the amount of time in milliseconds to add to UTC to get standard time in this
* time zone. Because this value is not affected by daylight saving time, it is called raw offset.
* If an underlying TimeZone implementation subclass supports historical GMT offset changes, the method
* returns the raw offset value of the current date. In Honolulu, for example, its raw offset
* changed from GMT-10:30 to GMT-10:00 in 1947, and this method
* always returns -36000000 milliseconds (i.e., -10 hours).
*/
int minuteOffset = - cal.getTimeZone().getRawOffset()/ ( 1000 * 60 * 15 );
return new Long (minuteOffset);
}
public static Date getUTCDate(Date issuingDate, Long date, Long time, Long UTCOffset) {
if (issuingDate == null) return null;
if (UTCOffset == null) return null;
if (time == null) return null;
if (date == null) {
date = 0L;
}
Calendar issuingCal = Calendar.getInstance();
issuingCal.clear();
issuingCal.setTime(issuingDate);
Calendar cal = Calendar.getInstance();
cal.clear();
cal.set(Calendar.YEAR,issuingCal.get(Calendar.YEAR) );
cal.set(Calendar.DAY_OF_YEAR,issuingCal.get(Calendar.DAY_OF_YEAR) );
cal.add(Calendar.DAY_OF_YEAR, date.intValue());
int hours = time.intValue() / 60;
int minutes = time.intValue() - hours * 60;
cal.set(Calendar.HOUR_OF_DAY, hours);
cal.set(Calendar.MINUTE,minutes);
cal.add(Calendar.MINUTE, (int) (UTCOffset * 15) );
cal.setTimeZone(TimeZone.getTimeZone("UTC"));
return cal.getTime();
}
public static Collection<Long> getActivatedDays(Date referenceDate, Collection<Date> days) {
ArrayList<Long> lDays = new ArrayList<Long>();
if (referenceDate == null) return lDays;
for (Date day : days) {
long dateDiff2 = DateTimeUtils.getDateDifference(referenceDate,day);
lDays.add(dateDiff2);
}
return lDays;
}
public static Date dateToUTC(Date date){
return new Date(date.getTime() - Calendar.getInstance().getTimeZone().getOffset(date.getTime()));
}
}
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