I need to create an array of elements in javascript, which add 2 hours to a certain time I set. I give an example. The time is
14:00.
I need, to create an array that contains all 30 minute intervals up to 16:00.
Ex
14:00
14:30
15:00
15:30
What I would do was to create two methods: addTime and createDateArray.
On addTime function we use to convert a timestamp into a Date object so it is easier for you to manage rather than an 14:00 string.
const addTime = (_dateTimestamp, addHours, addMinutes, addSeconds) => {
const date = new Date();
date.setTime( _dateTimestamp );
const newDate = new Date();
if(addHours) newDate.setHours( date.getHours() + addHours );
if(addMinutes) newDate.setMinutes( date.getMinutes() + addMinutes );
if(addSeconds) newDate.setSeconds( date.getSeconds() + addSeconds );
return newDate;
}
const createDateArray = (date, minuteInterval, amount) => {
let array = [];
for(let i = 1; i <= amount; i++) {
const time = addTime( date, 0, minuteInterval * i, 0);
array.push( time );
}
return array;
}
const dateToIncrement = new Date().getTime();
const minutesInterval = 30; // every 30 minutes
const amountTimes = 10; // will run through 10 times, so it'll calculate the minutes 10 times
const result = createDateArray( dateToIncrement, minutesInterval, amountTimes );
console.log(result);You can also use the addTime function for other properties like hours and seconds if you wish by setting the second and last argument of the method.
I hope the code above makes sense and you can make use of it.
Here is a function that produces the time specifications as strings. It can take an optional second argument to specify the end-time (16:00 in your question).
Two utility functions convert a time string to (and from) a number of minutes.
Finally, the result array is created with Array.from:
const toMinutes = str => str.split(":").reduce((h, m) => h * 60 + +m);
const toString = min => (Math.floor(min / 60) + ":" + (min % 60))
.replace(/\b\d\b/, "0$&");
function slots(startStr, endStr="16:00") {
let start = toMinutes(startStr);
let end = toMinutes(endStr);
return Array.from({length: Math.floor((end - start) / 30) + 1}, (_, i) =>
toString(start + i * 30)
);
}
console.log(slots("14:00"));You can create a basic function like this :
function getTimes(start) {
start = parseInt(start) * 2 + (+start.slice(-2) > 0);
end = start+60/12;
return Array.from({length: end - start}, (_, i) =>
(((i + start) >> 1) + ":" + ((i + start)%2*3) + "0").replace(/^\d:/, "0$&"));
};
And use with :
getTimes("14:00");