Convert the date to the given timezone
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* Funambol is a mobile platform developed by Funambol, Inc.
* Copyright (C) 2003 - 2007 Funambol, Inc.
*
* This program is free software; you can redistribute it and/or modify it under
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
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import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
/**
* Utility class for date manipulation.
* This class gives a simple interface for common Date, Calendar and Timezone
* operations.
* It is possible to apply subsequent transformations to an initial date, and
* retrieve the changed Date object at any point.
*
*/
public class DateUtil {
//-------------------------------------------------------------- Attributes
private Calendar cal;
//------------------------------------------------------------ Constructors
/** Inizialize a new instance with the current date */
public DateUtil() {
this(new Date());
}
/** Inizialize a new instance with the given date */
public DateUtil(Date d) {
cal = Calendar.getInstance();
cal.setTime(d);
}
//---------------------------------------------------------- Public methods
/** Set a new time */
public void setTime(Date d) {
cal.setTime(d);
}
/** Get the current time */
public Date getTime() {
return cal.getTime();
}
/** Get the current TimeZone */
public String getTZ() {
return cal.getTimeZone().getID();
}
/**
* Convert the time to the midnight of the currently set date.
* The internal date is changed after this call.
*
* @return a reference to this DateUtil, for concatenation.
*/
public DateUtil toMidnight() {
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND,0);
return this;
}
/**
* Make the date go back of the specified amount of days
* The internal date is changed after this call.
*
* @return a reference to this DateUtil, for concatenation.
*/
public DateUtil removeDays(int days) {
Date d = cal.getTime();
long time = d.getTime();
time -= days * 24 * 3600 * 1000;
d.setTime(time);
cal.setTime(d);
return this;
}
/**
* Make the date go forward of the specified amount of minutes
* The internal date is changed after this call.
*
* @return a reference to this DateUtil, for concatenation.
*/
public DateUtil addMinutes(int minutes) {
Date d = cal.getTime();
long time = d.getTime();
time += minutes * 60 * 1000;
d.setTime(time);
cal.setTime(d);
return this;
}
/**
* Convert the date to GMT. The internal date is changed
*
* @return a reference to this DateUtil, for concatenation.
*/
public DateUtil toGMT() {
return toTZ("GMT");
}
/**
* Convert the date to the given timezone. The internal date is changed.
*
* @param tz The name of the timezone to set
*
* @return a reference to this DateUtil, for concatenation.
*/
public DateUtil toTZ(String tz) {
cal.setTimeZone(TimeZone.getTimeZone(tz));
return this;
}
/**
* Get the days passed from the specified date up to the date provided
* in the constructor
*
* @param date The starting date
*
* @return number of days within date used in constructor and the provided
* date
*/
public int getDaysSince(Date date) {
long millisecs = date.getTime();
Date d = cal.getTime();
long time = d.getTime();
long daysMillisecs = time - millisecs;
int days = (int)((((daysMillisecs / 1000)/60)/60)/24);
return days;
}
/**
* Utility method wrapping Calendar.after method
* Compares the date field parameter with the date provided with the constructor
* answering the question: date from constructor is after the given param date ?
*
* @param date The date to be used for comparison
*
* @return true if date from constructor is after given param date
*/
public boolean isAfter(Date date) {
Calendar cal2 = Calendar.getInstance();
cal2.setTime(date);
return cal.after(cal2);
}
}
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