# op:subtract-dayTimeDuration-from-time - XPath XQuery Reference

Returns the xs:time value that is a given duration before a specified
               xs:time (or after, if the duration is negative or causes wrap-around
            past midnight)Defines the semantics of
         the "-" operator when applied to an xs:time and an
            xs:dayTimeDuration value. deterministiccontext-independentfocus-independentThe function returns the result of negating $arg2 and adding the result to
               $arg1 using the function op:add-dayTimeDuration-to-time.op:subtract-dayTimeDuration-from-time(xs:time("11:12:00"),
                  xs:dayTimeDuration("P3DT1H15M"))xs:time("09:57:00")op:subtract-dayTimeDuration-from-time(xs:time("08:20:00-05:00"),
                  xs:dayTimeDuration("P23DT10H10M"))xs:time("22:10:00-05:00")