const createTimeSlots=(fromTime,toTime)=>{
        let timeAndDate=new Date()
        let timeDates=
        let array=[];
        let ob={}
        while(timeAndDate<=timeDates){
            ob={
                StartTime:timeAndDate.add(15,'minutes'),
                EndTime:timeDates
            }
            array.push(ob);
           
        }
        return array
}

I want to add 15 minutes slot to each StartTime in a loop and store in array of objects. timeAndDate=StartTime and timeDates=endTime for example 25th may 2:00pm is starttime and endTime is 25thmay 3pm so i want to add 15 minutes to each start time timestamp till it reaches 3pm

CodePudding user response：

Assuming the inputs are in timestamp, add 15 mins equivalent of timestamps and push that timestamp(or push mins/hrs etc.). Here's the code example where start time is current timestamp and endtime is current 3hrs in timestamp.

   function createSlots(start, end) {
    let slots = [];
    const mins = 15 * 60 * 1000; // 15 mins

    const date = (dt) => new Date(dt);

    while (start <= end) {
        start  = mins;

        // only mins
        //slots.push(date(start).getMinutes());

        // hrs    mins
        slots.push(`${date(start).getHours()}:${date(start).getMinutes()}`);
    }
    return slots;
}

var slots = createSlots(Date.now(), Date.now()   3 * 3600 * 1000); // from (now) to (now   3hrs)
console.log("slots : ", slots);

CodePudding user response：

Let's assume inputs are valid date-time format. This solution will work across dates, let's say you give the start time today and end time tomorrow then also it will work without any issue.

const createTimeSlots = (fromTime, toTime, slotLength =15*60) => {
    let slotStart = new Date(fromTime).valueOf();
    let slotEnd = new Date(fromTime).valueOf()   slotLength * 1000;
    let endEpoch = new Date(toTime).valueOf();
    let ob = [];
    for (slotEnd; slotEnd <= endEpoch; slotEnd = slotEnd   slotLength * 1000) {
        ob.push({
            'from': formatDate(slotStart),
            'to': formatDate(slotEnd)
        });
        slotStart = slotEnd;
    }
    return ob;
}

function formatDate(epoch) {
    let d = new Date(epoch);
    let month = String((d.getMonth()   1)).padStart(2, '0');
    let day = String((d.getDate())).padStart(2, '0');
    let hours = String((d.getHours())).padStart(2, '0');
    let mins = String((d.getMinutes())).padStart(2, '0');

    return `${d.getFullYear()}-${month}-${day} ${hours}:${mins}`;
}

const from = "2022-05-25 23:00";
const to = "2022-05-26 01:00";
const slotLength = 15 * 60; //seconds
var r = createTimeSlots(from, to, slotLength );
console.log(r);