Generate a 24 hour range of 30-minute time intervals that are i18n compatible

i18n-time-intervals.js

let items = [];
for (var hour = 0; hour < 24; hour++) {
  items.push([hour, 0]);
  items.push([hour, 30]);
}

const date = new Date();
const formatter = new Intl.DateTimeFormat('en-US', {
  hour: 'numeric',
  minute: 'numeric',
  hour12: false
});

const range = items.map(time => {
  const [hour, minute] = time;
  date.setHours(hour);
  date.setMinutes(minute);

  return formatter.format(date);
});

console.dir(range);

For lazy people like me:
0: "24:00"
1: "24:30"
2: "01:00"
3: "01:30"
4: "02:00"
5: "02:30"
6: "03:00"
7: "03:30"
8: "04:00"
9: "04:30"
10: "05:00"
11: "05:30"
12: "06:00"
13: "06:30"
14: "07:00"
15: "07:30"
16: "08:00"
17: "08:30"
18: "09:00"
19: "09:30"
20: "10:00"
21: "10:30"
22: "11:00"
23: "11:30"
24: "12:00"
25: "12:30"
26: "13:00"
27: "13:30"
28: "14:00"
29: "14:30"
30: "15:00"
31: "15:30"
32: "16:00"
33: "16:30"
34: "17:00"
35: "17:30"
36: "18:00"
37: "18:30"
38: "19:00"
39: "19:30"
40: "20:00"
41: "20:30"
42: "21:00"
43: "21:30"
44: "22:00"
45: "22:30"
46: "23:00"
47: "23:30"

having the option to use start & end time and generate the series between that would be nice.

const generateHoursInterval = (
  startHourInMinute,
  endHourInMinute,
  interval,
) => {
  const times = [];

  for (let i = 0; startHourInMinute < 24 * 60; i++) {
    if (startHourInMinute > endHourInMinute) break;

    var hh = Math.floor(startHourInMinute / 60); // getting hours of day in 0-24 format

    var mm = startHourInMinute % 60; // getting minutes of the hour in 0-55 format

    times[i] = ('0' + (hh % 24)).slice(-2) + ':' + ('0' + mm).slice(-2);

    startHourInMinute = startHourInMinute + interval;
  }

  return times;
};

const interval = 30; //minutes interval

const startDate = 60 * 7; // start time in minutes

const endDate = 60 * 21; // end time in minutes

const foo = generateHoursInterval(startDate, endDate, interval);

console.log(foo);
// ["07:00", "07:30", "08:00", "08:30", "09:00", "09:30", "10:00", "10:30", "11:00", "11:30", "12:00", "12:30", "13:00", "13:30", "14:00", "14:30", "15:00", "15:30", "16:00", "16:30", "17:00", "17:30", "18:00", "18:30", "19:00", "19:30", "20:00", "20:30", "21:00"]

@ridvanaltun +1

Awesome, very useful

mmm

Use { hourCycle: 'h23' } instead of { hour12: false }