org.clapper.util.misc
Class XDate

java.lang.Object
  java.util.Date
      org.clapper.util.misc.XDate

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Comparable<java.util.Date>

public class XDate
extends java.util.Date

Version of java.util.Date that provides some extra utility functions.

Version:

$Revision: 6735 $

Author:

Copyright © 2006 Brian M. Clapper

See Also:

Serialized Form

Constructor Summary

XDate()
Create a new XDate so that it represents the time the object was constructed, measure to the nearest millisecond.

XDate(java.util.Date date)
Create a new XDate object and initialize it to represent the time contained in the specified, existing Date object (which may, itself, be an XDate).

XDate(long millis)
Create a new XDate object and initialize it to represent the specified number of milliseconds since the epoch.

Method Summary

XDate	convertToTimeZone(java.util.TimeZone tz) Convert this date from its time zone to another.
java.lang.String	formatInTimeZone(java.lang.String dateFormat, java.util.TimeZone tz) Convenience method to produce a printable date in a specified time zone, using a SimpleDateFormat.

Methods inherited from class java.util.Date

after, before, clone, compareTo, equals, getDate, getDay, getHours, getMinutes, getMonth, getSeconds, getTime, getTimezoneOffset, getYear, hashCode, parse, setDate, setHours, setMinutes, setMonth, setSeconds, setTime, setYear, toGMTString, toLocaleString, toString, UTC

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

XDate

public XDate()

Create a new XDate so that it represents the time the object was constructed, measure to the nearest millisecond.

XDate

public XDate(long millis)

Create a new XDate object and initialize it to represent the specified number of milliseconds since the epoch.

Parameters:

millis - the milliseconds

XDate

public XDate(java.util.Date date)

Create a new XDate object and initialize it to represent the time contained in the specified, existing Date object (which may, itself, be an XDate).

Parameters:

date - the date

Method Detail

convertToTimeZone

public XDate convertToTimeZone(java.util.TimeZone tz)

Convert this date from its time zone to another. Sample use:

 // Convert time in default time zone to UTC

 XDate now = new XDate();
 TimeZone tzUTC = TimeZone.getTimeZone ("UTC");
 Date utc = now.convertToTimeZone (tzUTC);
 DateFormat fmt = new SimpleDateFormat ("yyyy/MM/dd HH:mm:ss z");
 fmt.setTimeZone (tzUTC);
 System.out.println (fmt.format (utc));
 

Or, more simply:

 XDate now = new XDate();
 System.out.println (now.formatInTimeZone ("yyyy/MM/dd HH:mm:ss z",
                                           TimeZone.getTimeZone ("UTC")));
 

Parameters:

tz - the time zone to convert the date to

Returns:

a new XDate object, appropriately converted. This result can safely be stored in a java.util.Date reference.

See Also:

formatInTimeZone(java.lang.String, java.util.TimeZone)

formatInTimeZone

public java.lang.String formatInTimeZone(java.lang.String dateFormat,
                                         java.util.TimeZone tz)

Convenience method to produce a printable date in a specified time zone, using a SimpleDateFormat. Calling this method is roughly equivalent to:

 XDate now = new XDate();
 TimeZone tzUTC = TimeZone.getTimeZone ("UTC");
 Date utc = now.convertToTimeZone (tzUTC);
 DateFormat fmt = new SimpleDateFormat ("yyyy/MM/dd HH:mm:ss z");
 fmt.setTimeZone (tzUTC);
 String formattedDate = fmt.format (utc);
 

Parameters:

dateFormat - the date format string to use, in a form that's compatible with java.text.SimpleDateFormat

tz - the desired time zone

Returns:

the formatted date string