Saxon

Legacy ID: #4237681 Legacy Poster: Michael Kay (mhkay)

These functions disappeared between the time the book went to press and the final XSLT 2.0 Recommendation. You can use the "-" operator to subtract dates or dateTimes to get a dayTimeDuration, for example xs:date('2007-04-26') - xs:date('2007-04-25') The option to get the difference between two dates in months or years disappeared because no-one could agree on exactly how it should be defined, for example what should be the result of 2004-02-29 minus 2004-01-31. So you have to define your own function, which can implement whatever you think the right semantics are. Regards Michael Kay

Legacy ID: #4239470 Legacy Poster: Giulio_Buccini (giulio_buccini)

Thanks for your fast answer and solution you proposed. I will do so. Giulio Buccini

Legacy ID: #4609080 Legacy Poster: Colin Green (colgreen)

So to confirm. We have the need to calculate a person's age in years based on their date of birth and today's date. And then say, ensuring it is 18 or more. So we can determine if they are 18 or over with something like: (xs:date("1989-11-06") + xs:yearMonthDuration("P18Y")) <= current-date() But there is no direct way of actually calculating the age? e.g. so that we can store the result in a variable and re-use it. Cheers, Colin Green

Legacy ID: #4609119 Legacy Poster: Michael Kay (mhkay)

Correct, there is no direct way to calculate someone's age in years by subtracting two dates. Sounds like a candidate for a third-party function library. Suggestion: extract the year components of the two dates, subtract giving $A; if birth date + $a*yearMonthDuration('P1Y') < current-date() then age is $A else age is $A - 1.

Legacy ID: #4612626 Legacy Poster: Colin Green (colgreen)

Thanks. We have indeed implemented our own function to do this as calculating ages is quite a common requirement for us.