How can I calculate the absolute value of a number in XSLT?

Question

I have

DifferenceInDays has a value that can be a negative or a posi

Answer 1

In XPath 1.0 use the following expression:

   $vNum*($vNum >=0) - $vNum*($vNum < 0)

In case this expression is embedded in an XSLT (XML) attribute, the < character must be escaped:

   $vNum*($vNum >=0) - $vNum*($vNum < 0)

In XPath 2.0 (XSLT 2.0) use the abs() function.