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How can I find the closest time to the current time from an array using momentjs?

I have an array of values [180, 360, 540, 720, 900, 1080, 1260]

. Each element of the array describes the number of minutes after midnight UTC.

Using momentjs , how can I find the element of the array closest to the current time 'Europe/London'

?

So far I've managed to get the current time 'Europe/London'

using moment-timezone.js :

var currentTime = moment().tz('Europe/London');

But now I am trying to find the closest array element to currentTime

.

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2 answers


If at all possible, you should keep the value in UTC until you're ready to format. The time zone, along with the date format, is usually a part of the localization, not something you want to embed too deeply into your business logic. Note that there were time slots that changed the local time flow, which is a nightmare for everyone.

With your input and comparison data as in UTC, you can simply sort the array by absolute difference:



var now = moment.utc();
var target = now.hours() * 60 + now.minutes();
var data = [180, 360, 540, 720, 900, 1080, 1260]

var sorted = data.sort(function(a, b) {
  var dA = Math.abs(a - target),
    dB = Math.abs(b - target);
  if (dA < dB) {
    return -1;
  } else if (dA > dB) {
    return 1;
  } else {
    return 0;
  }
});

document.getElementById('r').textContent = JSON.stringify(sorted);
      

        
        
        
      

    
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.2/moment.min.js"></script>
<pre id="r"></pre>
Run code


Then the first element will be the closest, and the rest will remain in order of distance.

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try it



var x= [180, 360, 540, 720, 900, 1080, 1260]

closestTime=500
var newar=[]

for(i=0;i<x.length;i++){
newar.push(Math.abs(closestTime-x[i]))
}

var i = newar.indexOf(Math.min.apply(Math, newar));
console.log(x[i])
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