Summing Up Of Difference In Timings In Json Array Of Angularjs Application Is Going Wrong

I have the following array of json objects and function to get total Hours count. $scope.workingHrsList = [ { 'uniqueStartTime': '4.00', //4 AM 'uniqueEndTime': '16.45

Solution 1:

you are using 24hrs format, then try this,

$scope.workingHrsList = [
                    {   
                        "uniqueStartTime": "4.00", //4 AM"uniqueEndTime": "16.45"//4.45 PM
                    },
                    {   
                        "uniqueStartTime": "16.45", //4.45 PM"uniqueEndTime": "3.15"// 3.15 AM
                    },
                    {   
                        "uniqueStartTime": "3.15", //3.15 AM"uniqueEndTime": "4.00"// 4.00 AM
                    }
                ];



functiongetTotalHoursCount() {
        var totalHrs = 0, uEndTime = 0, uStartTime = 0, diff = 0;
        for (var i = 0; i < $scope.workingHrsList .length; i++) {

            uEndTime   = parseFloat($scope.workingHrsList[i].uniqueEndTime);
            uStartTime = parseFloat($scope.workingHrsList[i].uniqueStartTime);

            //always start greater than end time if not //it means they worked continued for next day, //so we need to 24 hrs with end timeif(uEndTime > uStartTime){
                diff = uEndTime - uStartTime;
            }
            else{
                diff = (uEndTime + 24) - uStartTime;
            }

            totalHrs += diff;
            $scope.workingHrsList[i].diffHrs = diff;

            console.log("End : " + uEndTime);
            console.log("Start : " + uStartTime);
            console.log("Row Hrs with Index " + i + "  : " + totalHrs);
        }
        console.log("Total Hours : " + totalHrs);
        return totalHrs;
    }

Solution 2:

I think your problem is the way you are handling your time differences. For row[1] your end time is before your start time. So you need to add on 24 hours to account for that. Here is some updated logic for your loop:

var row = workingHrsList[i];
var endTime = parseFloat(row["uniqueEndTime"]);
var startTime = parseFloat(row["uniqueStartTime"])

var diff = endTime - startTime;

if(diff < 0) {
  diff += 24;
  console.log("24 hours added");
}

totalHrs += diff;

Here is a simple working example. https://jsfiddle.net/L4oq1p85/