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Re: The UNIX epoch, or time since Jan 01, 1970

Subject: Re: The UNIX epoch, or time since Jan 01, 1970
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 21 May 2012 12:33:35 -0400
Re:  The UNIX epoch
See pages 340 and 344 of my "Practical Transformation Using XSLT and XPath" book for a bit more detail.

For those without a copy, I've made it available from our web site on a "Try and buy" premise: you download the complete book and if you like it I ask you to be honest about it and pay for it ... if you don't like it, then please delete it.

The book is a superset of the material I use in the instructor-led class (not including hands-on exercises) that I have the privilege of teaching around the world. If you have questions about the book or the teaching, please ask directly and not on the list.

. . . . . . . . . . . Ken

At 2012-05-21 12:28 -0400, G. Ken Holman wrote:
At 2012-05-21 17:06 +0100, Florent Georges wrote:
  As part of sending an OAuth request to connect to Twitter, I have to
get a timestamp, as the number of seconds elapsed from Jan 01, 1970
(AKA the UNIX epoch).  The simplest solution I could come with is the

Remember you can do arithmetic with durations. I think this is even simpler:

T:\ftemp>xslt2 florent.xsl florent.xsl
<?xml version="1.0" encoding="UTF-8"?>1337617644.811
T:\ftemp>xslt2 florent.xsl florent.xsl
<?xml version="1.0" encoding="UTF-8"?>1337617649.455
T:\ftemp>type florent.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

<xsl:template match="/">
  <xsl:value-of select="my:current-timestamp()"/>

<xsl:function name="my:current-timestamp" as="xs:string">
<!-- the UNIX epoch -->
<xsl:variable name="epoch" select="xs:dateTime('1970-01-01T00:00:00Z')"/>

       <!-- time since then -->
       <xsl:variable name="diff"  select="current-dateTime() - $epoch"/>
       <!-- number of seconds -->
       <xsl:sequence select="string($diff div xs:dayTimeDuration('PT1S'))"/>


I hope this helps.

. . . . . . . . Ken

Public XSLT, XSL-FO, UBL and code list classes in Europe -- Oct 2012
Contact us for world-wide XML consulting and instructor-led training
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