SPARQL Calculating the difference between two date -


what function calculate difference between 2 sparql xsd:datetime ?

i have found reference datediff, not working. such built in function exist in sparql other query languages?

some sparql engines may support date arithmetic directly. instance, mention in this answers.semanticweb.com question , answer, jena supports date arithmetic, , can subtract 1 date , xsd:duration. other implementations may support datediff function. instance, this virtuoso example includes use of bif:datediff. however, these extensions , not guaranteed present in particular sparql implementation.

for more portable, though possibly less efficient solution, can use year extract year parts datetime. lets do, instance, 

select ?age {    bind( "1799-12-14"^^<http://www.w3.org/2001/xmlschema#date> ?death )   bind( "1732-02-22"^^<http://www.w3.org/2001/xmlschema#date> ?birth )   bind( year(?death)-year(?birth) ?age ) }

and results

------- | age | ======= | 67  | -------

this has potential off one, depending on months , days of 2 dates, can work around using month , day functions. this thread describes of sort of implementation.


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