Function to valid if a specific time is between two hours, including when pass through midnight

between-hours.js

const splitStringTime = str => str.split(":").map(str => parseInt(str, 10));
const leftZero = str => ("0" + str).slice(-2);

function isBetweenTimes({ startTime, endTime, nowTime }) {
  const [hourStart, minuteStart] = splitStringTime(startTime);
  const [hourEnd, minuteEnd] = splitStringTime(endTime);
  const [hourNow, minuteNow] = splitStringTime(nowTime);

  const startMinutes = hourStart * 60 + minuteStart;

  const endMinutes =
    hourEnd > hourStart
      ? hourEnd * 60 + minuteEnd
      : hourEnd * 60 + minuteEnd + 60 * 24;

  const nowMinutes =
    (hourEnd > hourNow && hourStart < hourEnd) ||
    (hourStart < hourNow && hourEnd < hourStart) ||
    (hourEnd === hourNow && minuteEnd < minuteNow) ||
    (hourEnd === hourNow && minuteEnd > minuteNow && hourStart < hourEnd) ||
    (hourStart === hourNow && minuteStart <= minuteNow)
      ? hourNow * 60 + minuteNow
      : hourNow * 60 + minuteNow + 60 * 24;

  return startMinutes <= nowMinutes && nowMinutes < endMinutes;
}

const date = new Date("01/01/2020 00:00").getTime();
const limit = 60 * 24;
const perMinute = 1;
for (let i = 0; i < limit; i = i + perMinute) {
  const dateNow = new Date(date + 60 * i * 1000);

  const hourToTest = `${leftZero(dateNow.getHours())}:${leftZero(
    dateNow.getMinutes()
  )}`;

  const isValid = isBetweenTimes({
    startTime: "23:30",
    endTime: "00:30",
    nowTime: hourToTest
  });

  if (isValid) {
    console.log(`${hourToTest} -> It's between these two hours and minutes`);
  } else {
    console.log(hourToTest);
  }
}