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Calculate difference between two times on Qualtrics

Respondents record a start time (time to bed) and and end time (time out of bed) in separate questions using flatpickr’s time picker. The responses are recorded in the format, for example, 11:00 PM and 8:00 AM, for start time and end time respectively.

I need to calculate time in bed = (time out of bed - time to bed) in minutes.

To calculate time in bed, I attempted the following:

Qualtrics.SurveyEngine.addOnload(function()
{
    /*Place your JavaScript here to run when the page loads*/

});

Qualtrics.SurveyEngine.addOnReady(function()
{
      // get the values of the start and end time questions
    var timeToBed = "${q://QID4/ChoiceTextEntryValue}";
    var timeOutOfBed = "${q://QID12/ChoiceTextEntryValue}";


    // create Date objects for the start and end times
    var timeToBedDate = new Date("1/1/2000 " + timeToBed);
    var timeOutOfBedDate = new Date("1/1/2000 " + timeOutOfBed);
    

    // check if the end time is before the start time (i.e. the times are on different days)
    if (timeOutOfBed < timeToBed) {
        timeOutOfBedDate.setDate(timeOutOfBedDate.getDate() + 1);
    }
    
    // calculate the difference in minutes
    var timeInBedMinutes = (timeOutOfBedDate - timeToBedDate) / 1000 / 60;

    // save the difference as an embedded data variable
    Qualtrics.SurveyEngine.setEmbeddedData("timeInBed", timeInBedMinutes);

});

Qualtrics.SurveyEngine.addOnUnload(function()
{
    /*Place your JavaScript here to run when the page is unloaded*/

});
Via Active questions tagged javascript - Stack Overflow https://ift.tt/R5uPKkB
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