java timestamp | keyongtech

08-19-05, 11:41 PM

netkev

Ive search this newsgroup and google for a couple days now(off and on)
and have not been able to figure this out. How do I get the current
system time in the format: 2005-03-02T16:40:37.46Z ?

I beleive people call this Zulu time, or military time? I have a way
of "kludging" it together by pulling out each field of a Calendar
instance but I think there's got to be a better way.

Thanks in advance,
Kevin

08-21-05, 04:06 AM

Roedy Green

On 19 Aug 2005 15:41:53 -0700, netkev wrote or quoted :

>I beleive people call this Zulu time, or military time? I have a way
>of "kludging" it together by pulling out each field of a Calendar
>instance but I think there's got to be a better way.

to get anything like that you would need a SimpleDateFormat.

See http://mindprod.com/jgloss/calendar.html

08-21-05, 04:15 AM

Roedy Green

On 19 Aug 2005 16:04:12 -0700, "ninhoa" <ninhoa> wrote or
quoted :

>> system time in the format: 2005-03-02T16:40:37.46Z ?
>
>Something like this? (copied from the SimpleDateFormat javadocs)
>
>SimpleDateFormat sdf = new
>SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SS'Z'");
>System.out.println(sdf.format(new Date()));

SSS would give milliseconds. What does SS give? centiseconds or an
overflowing ms field?

08-21-05, 04:21 AM

Roedy Green

On 19 Aug 2005 16:04:12 -0700, "ninhoa" <ninhoa> wrote or
quoted :

>
>SimpleDateFormat sdf = new
>SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SS'Z'");
>System.out.println(sdf.format(new Date()));

That's not quite right. That will give you local time. I think he
wants UTC.

08-21-05, 04:34 AM

Roedy Green

On 19 Aug 2005 15:41:53 -0700, netkev wrote or quoted :

> How do I get the current
>system time in the format: 2005-03-02T16:40:37.46Z ?

this code is posted at http://mindprod.com/jgloss/calendar.html

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

public class Zulu
{
/**
* Display current Zulu/UTC military time,
* e.g. 2005-08-21T03:28:48.09Z
* @param args not used
*/
public static void main ( String[] args )
{
SimpleDateFormat sdf =
new SimpleDateFormat( "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'" );
TimeZone utc = TimeZone.getTimeZone( "UTC" );
sdf.setTimeZone ( utc );
String milliformat = sdf.format( new Date() );
// convert from milliseconds to centiseconds
// by chopping off last digit
String zulu = milliformat.substring( 0, 22 ) + 'Z' ;
System.out.println( zulu );
}
}

08-22-05, 04:43 PM

Roedy Green

On Sun, 21 Aug 2005 03:15:16 GMT, Roedy Green
<look-on> wrote or quoted :

>>SimpleDateFormat sdf = new
>>SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SS'Z'");
>>System.out.println(sdf.format(new Date()));
>
>SSS would give milliseconds. What does SS give? centiseconds or an
>overflowing ms field?

Actually it gives the same as SSS, a three digit field.

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