BahmniObsValueCalculator.groovy

    public void run(BahmniEncounterTransaction bahmniEncounterTransaction) {
        calculateAndAdd(bahmniEncounterTransaction);
        calculateDiffSurgTimeInAndOut(bahmniEncounterTransaction);
    }

   static def calculateDiffSurgTimeInAndOut(BahmniEncounterTransaction bahmniEncounterTransaction){
        Collection<BahmniObservation> observations = bahmniEncounterTransaction.getObservations()
        BahmniObservation surgicalTimeDataObservation = find("OR Section", observations, null);

        BahmniObservation surgicalTimeInObservation = find("Surgical Time In",surgicalTimeDataObservation ? [surgicalTimeDataObservation] : [], null);
        BahmniObservation surgicalTimeOutObservation = find("Surgical Time Out", surgicalTimeDataObservation ? [surgicalTimeDataObservation] : [], null);

        BahmniObservation surgicalTotalTimeObservation = find("Surgical Total Time", surgicalTimeDataObservation ? [surgicalTimeDataObservation] : [], null);

        Date obsDatetime = getDate(surgicalTimeInObservation) != null ? getDate(surgicalTimeInObservation) : getDate(surgicalTimeOutObservation)
        surgicalTotalTimeObservation = surgicalTotalTimeObservation ?: createObs("Surgical Total Time", surgicalTimeDataObservation, bahmniEncounterTransaction, obsDatetime) as BahmniObservation;

        def start = Date.parse("yyyy-MM-dd HH:mm",surgicalTimeInObservation.getValue());
        def end = Date.parse("yyyy-MM-dd HH:mm",surgicalTimeOutObservation.getValue());
        TimeDuration duration = TimeCategory.minus(end, start);

        surgicalTotalTimeObservation.setValue(duration);
        return;
    }