Given date + Days = Next Date?

[Thomas Lehmann]

Hi,

Assume the start of a project is defined by attribute "start": 13.9.2011 (just an example)
Now I calculate a value in days for a project (basing on estimations).
How do I calculate the end date?

Folgendes funktioniert nicht:
<xsl:value-of select="@start + $days"/>

Grüße
Thomas

[Christian Wahl]

I think you need support for XPath 2.0 like http://www.exslt.org/ to calculate dates.

You can see a list of functions here:
http://www.w3.org/TR/xquery-operators/#comp.duration.datetime
or here:
http://www.w3schools.com/xpath/xpath_functions.asp#datetime

– otherwise you are on your one with string manipulation.

How are you doing your transformations?

[Thomas Lehmann]

Usually I'm using the automatic transforming by defining it in the XML.
I know .... the transformation depends then on the browser.

The advantage is that a change in the XML does not require
manual work also a final HTML is just a one line command.

I solved the problem - for now - by generating a dates.xml
with dates and offset as attributes and inside of the tag the
result of the calculation $date + $days. A simple python
script does the job. The final query is simple:
<xsl:value-of select="document('dates.xml')/*/date[@start=$start-date and @days=$calculated-days]"/>

I know - most will shake their heads - including me.