Convert HH:MM:SS string to seconds only in javascr

问题:

I am having similar requirement as this: Convert time in HH:MM:SS format to seconds only?

but in javascript. I have seen many examples of converting seconds into different formats but not HH:MM:SS into seconds. Any help would be appreciated.

回答1:

Try this:

var hms = '02:04:33';   // your input string
var a = hms.split(':'); // split it at the colons

// minutes are worth 60 seconds. Hours are worth 60 minutes.
var seconds = (+a[0]) * 60 * 60 + (+a[1]) * 60 + (+a[2]); 

console.log(seconds);

回答2:

This function handels "HH:MM:SS" as well as "MM:SS" or "SS".

function hmsToSecondsOnly(str) {
    var p = str.split(':'),
        s = 0, m = 1;

    while (p.length > 0) {
        s += m * parseInt(p.pop(), 10);
        m *= 60;
    }

    return s;
}

回答3:

This can be done quite resiliently with the following:

'01:02:03'.split(':').reduce((acc,time) => (60 * acc) + +time);

This is because each unit of time within the hours, minutes and seconds is a multiple of 60 greater than the smaller unit. Time is split into hour minutes and seconds components, then reduced to seconds by using the accumulated value of the higher units multiplied by 60 as it goes through each unit.

The +time is used to cast the time to a number.

It basically ends up doing: (60 * ((60 * HHHH) + MM)) + SS

回答4:

Convert hh:mm:ss string to seconds in one line. Also allowed h:m:s format and mm:ss, m:s etc

'08:45:20'.split(':').reverse().reduce((prev, curr, i) => prev + curr*Math.pow(60, i), 0)

回答5:

Since the getTime function of the Date object gets the milliseconds since 1970/01/01, we can do this:

var time = '12:23:00';
var seconds = new Date('1970-01-01T' + time + 'Z').getTime() / 1000;

回答6:

try

time="12:12:12";
tt=time.split(":");
sec=tt[0]*3600+tt[1]*60+tt[2]*1;

回答7:

Javascript's static method Date.UTC() does the trick:

alert(getSeconds('00:22:17'));

function getSeconds(time)
{
    var ts = time.split(':');
    return Date.UTC(1970, 0, 1, ts[0], ts[1], ts[2]) / 1000;
}

回答8:

new Date(moment('23:04:33', "HH:mm")).getTime()

Output: 1499755980000 (in millisecond) ( 1499755980000/1000) (in second)

Note : this output calculate diff from 1970-01-01 12:0:0 to now and we need to implement the moment.js

回答9:

This function works for MM:SS as well:

const convertTime = (hms) => {
        if (hms.length <3){
         return hms
        } else if (hms.length <6){
          const a = hms.split(':')
          return hms = (+a[0]) * 60 + (+a[1])
        } else {
          const a = hms.split(':')
          return hms = (+a[0]) * 60 * 60 + (+a[1]) * 60 + (+a[2])
        }
      }

回答10:

function parsehhmmsst(arg) {
	var result = 0, arr = arg.split(':')
	if (arr[0] < 12) {
		result = arr[0] * 3600 // hours
	}
	result += arr[1] * 60 // minutes
	result += parseInt(arr[2]) // seconds
	if (arg.indexOf('P') > -1) {  // 8:00 PM > 8:00 AM
		result += 43200
	}
	return result
}
$('body').append(parsehhmmsst('12:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('1:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('2:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('3:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('4:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('5:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('6:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('7:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('8:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('9:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('10:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('11:00:00 AM') + '<br>')
$('body').append(parsehhmmsst('12:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('1:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('2:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('3:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('4:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('5:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('6:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('7:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('8:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('9:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('10:00:00 PM') + '<br>')
$('body').append(parsehhmmsst('11:00:00 PM') + '<br>')

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

回答11:

You can do this dynamically - in case you encounter not only: HH:mm:ss, but also, mm:ss, or even ss alone.

var str = '12:99:07';
var times = str.split(":");
times.reverse();
var x = times.length, y = 0, z;
for (var i = 0; i < x; i++) {
    z = times[i] * Math.pow(60, i);
    y += z;
}
console.log(y);