Custom javascript only works with browsers on laptops but not on mobile devices?

Question

Hello community,

I included a custom javascript in my survey to get the local date and time when my respondents load the survey page. The logic flow I set in the survey then used these variables in the javascript as embedded data to decide which page to display. The codes work like a charm only with Chrome on my mac. _However, it didn't work on safari on mac nor safari/chrome on my iPhone/iPad._ Below is the script I included in my survey:

var d = new Date();
        Qualtrics.SurveyEngine.setEmbeddedData("hour", d.getHours());
    var start = new Date(2019-3-3),
        end   = new Date(),
        diff  = new Date(end - start),
        days  = Math.floor (diff/1000/60/60/24);
        Qualtrics.SurveyEngine.setEmbeddedData('day',days);

Any thoughts why such an issue, and how I can make it to work across browsers and devices? Thanks!

TomG · Accepted Answer

> @echongsk said:> Thanks for your reply, @TomG! How do you install moment.js in qualtrics? I'm not experienced with this. Any suggestions would be helpful. Thank you!Add this to your header:``````

TomG · Answer

@echongsk,My guess is that Safari isn't parsing 2019-3-3 correctly.  Date parsing is inconsistent among browsers.  I recommend using moment.js moment.js for anything beyond basic date handling such as parsing, arithmetic and formatting.

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