CODEWITHSUNDEEP
javascriptjquery
user1765862
user1765862

Reputation: 14145

compare times in javascript

I have array of time data in format HH:mm like 13:58. Let's say that array has 50 entries with different times. How can I compare new time for example 18:29 is it bigger than any inside array? Should I convert each time into seconds or is there better approach?

Upvotes: 1

Views: 359

Answers (3)

Mr. Polywhirl
Mr. Polywhirl

Reputation: 48600

You can write a comparator function. All you need to do is pass the hour and minutes into a Date constructor and get the milliseconds.

function toIntArray(arr) {
  return arr.map(function(x) { return parseInt(x, 10) });
}
function timeToMillisecondsUTC(time) {
  var tokens = toIntArray(time.split(':'));
  return Date.UTC(1970, 0, 1, tokens[0], tokens[1]);
}
function timeCompare(a, b) {
  return timeToMillisecondsUTC(a) - timeToMillisecondsUTC(b);
}

var dateStrings = [ '13:58', '18:29', '15:25', '12:01' ];

console.log(dateStrings.sort(timeCompare));
.as-console-wrapper { top: 0; max-height: 100% !important; }

Upvotes: 0

alebianco
alebianco

Reputation: 2555

Here's a solution that uses regexps and String.replace to convert the time to a number of minutes, so it can be easily compared.

The uses the Array.every method to check if every entry of a list returns true from the predicate function

let convert = s => s.replace(/(\d+):(\d+)/, (match, $1, $2) => $1*60 + $2*1);
let list = ["11:25", "10:38"];
let out = list.every(entry => convert(entry) > convert("18:29"));

console.log(out)

Upvotes: 0

rainerhahnekamp
rainerhahnekamp

Reputation: 1136

You can use momentjs:

var time1 = "18:58";
var time2 = "20:30";

var isBefore = moment(time1, "HH:mm").isBefore(moment(time2, "HH:mm"));
console.log(isBefore);

Upvotes: 1

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