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From fazi <faisal.ans...@gmail.com>
Subject How do I persist timestamp in UTC timezone?
Date Tue, 17 Mar 2009 16:56:43 GMT

Hi 

I need to persist all timestamps in UTC timezone. I found this documentation
which talks about using Calendar by setting the timezone value to the
desired timezone
(http://openjpa.apache.org/builds/1.1.0/apache-openjpa-1.1.0/docs/manual/ref_guide_pc_scos.html#ref_guide_pc_calendar_timezone),
plus this JIRA (https://issues.apache.org/jira/browse/OPENJPA-322) that
gives me some idea on how I can initialize Calendar to insert/update time in
UTC but nothing has worked so far. The timestamps are always entered and
read in DB local timezone (PDT). I noticed that the Calendar timezone of the
retrieved object is set correctly to UTC, however, the time is still in
local timezone (PDT). I also noticed that the retrieved object has JPA
implementation of the Calendar object:
org.apache.openjpa.util.java$util$GregorianCalendar$proxy.  

We are using openJPA version 1.1.0. 

I am copying my artifacts below. The test class has two timestamp fields,
one is for UTC timezone and the other one is for local timezone to show that
both values are same. 

Please let me know if any other information can help understand this problem
better. 

Any help on this matter will be greatly appreciated. 

---------------------------------------------------------
TestDate table:
CREATE TABLE DATETEST (
                ID VARCHAR(255) NOT NULL,
                CREATEDTIME TIMESTAMP, 
                STARTTIME TIMESTAMP)
 
----------------------------------------------------------

----------------------------------------------------------
JPA class:
----------------------------------------------------------
package com.my.package.entity;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import javax.persistence.*;


@Entity
@Table(name="DATETEST")
public class DateTest implements Serializable  {

	@Id
	@Column(name="ID")
	private	 String  id;

	@Temporal(TemporalType.TIMESTAMP)
	@Column(name="CREATEDTIME")
	private	 Calendar  createdTime =
Calendar.getInstance(TimeZone.getTimeZone("UTC"));

	@Temporal(TemporalType.TIMESTAMP)
	@Column(name="STARTTIME")
	private	 Date  startTime;

	public Calendar getCreatedTime() {
		return createdTime;
	}

	public void setCreatedTime(Calendar createdTime) {
		this.createdTime = createdTime;
	}

	public Date getStartTime() {
		return startTime;
	}

	public void setStartTime(Date startTime) {
		this.startTime = startTime;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}
}
----------------------------------------------------------

----------------------------------------------------------
JUnit test:
----------------------------------------------------------
   @Test
   public void testDate()
   {
     
     DateTest dt = new DateTest();
     dt.setId(id);
     dt.setCreatedTime(Calendar.getInstance(TimeZone.getTimeZone("UTC")));
     dt.setStartTime(new Date());
 	
     try
     {
       //persist
     }
     catch (Exception e)
     {
       fail(e.getMessage());
     }
     
     // Check result
     DateTest returned = null;
     try
     {
       returned = //find by id;
       Calendar createdTimeC = returned.getCreatedTime();
       System.out.println("createdTime type    : " +
createdTimeC.getClass().getName());
       System.out.println("createdTime timezone: " +
createdTimeC.getTimeZone());
       System.out.println("Created time        : " +
createdTimeC.getTime());
       System.out.println("Start time          : " +
returned.getStartTime());
       System.out.println("Created time (millisecs): " +
createdTimeC.getTimeInMillis());
       System.out.println("Start time (millisecs)  : " +
returned.getStartTime().getTime());
     }
     catch (Exception e)
     {
       fail(e.getMessage());
     }
     
   }  
----------------------------------------------------------

The output is:

createdTime type    :
org.apache.openjpa.util.java$util$GregorianCalendar$proxy
createdTime timezone:
sun.util.calendar.ZoneInfo[id="UTC",offset=0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null]
Created time        : Tue Mar 17 09:40:39 PDT 2009
Start time          : Tue Mar 17 09:40:39 PDT 2009
Created time (millisecs): 1237308039662
Start time (millisecs)  : 1237308039662

----------------------------------------------------------
And the DB entry shows:

db2> select * from DATETEST

ID                       CREATEDTIME                               
STARTTIME
---------------    ----------------------------------  
-------------------------------------
utc_test1            2009-03-16-16.14.32.380000           
2009-03-16-16.14.32.380000


1 record(s) selected.

db2>

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