How to add 30 minutes to a specified time (min & max time) in javascript

Question

How to add 30 minutes to a specified time (min & max time) in javascript.For example: I have start time as 03:00 AM and end time as 05:00 PM and I need to add 30minutes from start time to end time.

What have you tried? We expect people to at least make an effort and post what they done so far. Also, a Google search of your title will help you no end, but funnily enough, that was a no effort question too, but got over 600 up-votes... — Ken Y-N, Nov 29 '18 at 06:08
This seems like a really simple math problem.... What *exactly* are you having trouble figuring out? — Claies, Nov 29 '18 at 06:09
Possible duplicate of [How to add 30 minutes to a JavaScript Date object?](https://stackoverflow.com/questions/1197928/how-to-add-30-minutes-to-a-javascript-date-object) — Ken Y-N, Nov 29 '18 at 06:10

score 0 · Accepted Answer · 2018-11-29T07:14:23.550

You can achieve this by spliting the Time

this is how it can be done

var startTime = '03:00 AM';
var newStartTime = startTime;
var endTime = '05:00 AM';
var minutes=0;
var hours=0;
var timeArray=[];
var ampm='';
var executing=true;
while(executing) {
    timeArray.push(newStartTime);
    minutes = Number(minutes) + 30;
    hours = newStartTime.split(' ')[0].split(':')[0]
    ampm= newStartTime.split(' ')[1];
    if(minutes > 59) {
        if(Number(hours) > 12) {
            ampm = newStartTime.split(' ')[1] == 'AM'?'PM':'AM';
            hours = '01';
        }
        else {
            hours = Number(hours) + 1;
            if(hours.toString().length ==1) {
                hours = '0' + hours;
            }
        }
        minutes = minutes - 60;
    }
    if(minutes.toString().length ==1) {
                minutes = '0' + minutes;
    }
    newStartTime = hours + ':' + minutes+' ' +ampm;
    if(Number(newStartTime.split(' ')[0].split(':')[0]) > Number(endTime.split(' ')[0].split(':')[0])){
        if(newStartTime.split(' ')[1] == endTime.split(' ')[1])
            executing = false;
    }
    else if(Number(newStartTime.split(' ')[0].split(':')[0]) == Number(endTime.split(' ')[0].split(':')[0])) {
         if(Number(newStartTime.split(' ')[0].split(':')[1]) >= Number(endTime.split(' ')[0].split(':')[1])) {
            if(newStartTime.split(' ')[1] == endTime.split(' ')[1])
                executing = false;
        }
    }
}
timeArray.push(endTime);

here is a small JsFiddle for you

you can do the same with endTime,

there are many other ways to do this and this is one of those,

hope this solve your problem,

This works for adding 30 minutes to the time we are giving. But I am expecting like, if start time is 03:00AM and end time is 05:00PM, i need to get as 03:00AM, 03:30AM, 04:00AM, 04:30AM..........05:00PM. — Nandha, Nov 29 '18 at 06:38
so can you please explain me properly what do you actually wants — , Nov 29 '18 at 06:44
Sure. I have two time (start & end). I need to add 30 minutes each from start time till it reaches the end time. For example start time is 3:00Am and end time is 5:00PM. So I need an output as 3:00AM, 3:30AM, 4;00AM and till reaches 5:00PM. Hope you get it? — Nandha, Nov 29 '18 at 06:48

How to add 30 minutes to a specified time (min & max time) in javascript

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