op:subtract-dayTimeDuration-from-date - XPath XQuery Reference

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XPath/XQuery subtract-dayTimeDuration-from-date function

Returns the xs:date that is a given duration before a specified xs:date (or after, if the duration is negative).

Defines the semantics of the "-" operator when applied to an xs:date and an xs:dayTimeDuration.

op:subtract-dayTimeDuration-from-date(

$arg1 as xs:date,
$arg2 as xs:dayTimeDuration

) as xs:date

This function is deterministic, context-independent, and focus-independent.

Returns the xs:date computed by negating $arg2 and adding the result to $arg1 using the function op:add-dayTimeDuration-to-date.

The expression op:subtract-dayTimeDuration-from-date(xs:date("2000-10-30"), xs:dayTimeDuration("P3DT1H15M")) returns xs:date("2000-10-26").

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