date_diff

The date function used to return the difference between two date or datetime values as a given unit of duration. Takes three arguments, the start date, the end date, and the unit of duration (one of "year", "decade", "century", "quarter", "month", "week", "day", "hour", "minute", "second", or "millisecond").

Returns: integer

PREFIX : <https://ddw-doccorp.linked.data.world/d/sparql-function-sample-queries/>
PREFIX fn: <http://data.world/function/functions#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT (fn:date_diff("2001-01-01"^^xsd:date, "2001-01-15"^^xsd:date, "day") as ?date_diff)
{
}