Run results for: Daily/Weekly using Date vs Math

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Firefox/60.0

Browser: Firefox 60

Operating system: Mac OS X 10.13

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Math	686.7 Ops/sec
Date Manipulation	4047.7 Ops/sec

Script Preparation code:

var start_timestamp = new Date('2018-01-04T16:30:00.000Z');
var end_timestamp = new Date('2018-01-05T14:00:00.000Z');

var now1 = new Date('2018-06-05T11:30:00.000Z');
var now2 = new Date('2018-06-05T15:30:00.000Z');
var now3 = new Date('2018-06-04T11:30:00.000Z');
var now4 = new Date('2018-06-04T15:30:00.000Z');

var DAY = 24 * 60 * 60 * 1000;
var WEEK = DAY * 7;

var checkRepeated = (now, start, end, isDaily) => {
  const repeat = isDaily ? DAY : WEEK;
  if (now > start && now < end) {
    return true;
  } else if (now > start) {
    const count = Math.floor((now - start) / repeat);
    const newStart = (count * repeat) + start;
    const newEnd = (count * repeat) + end;
    if (now > newStart && now < newEnd) {
      return true;
    }
  }
  return false;
};

var isBetween = (now, start, end, isDaily) => {
  if (isDaily) {
    if (start - end >= 86400000) {
      return true;
    }
  } else {
    const nowDay = now.getDay();
    if (nowDay < start.getDay() || nowDay > end.getDay()) {
      return false;
    }
  } 

  const time = now - (new Date(now)).setHours(0, 0, 0, 0);
  const startDate = (new Date(start)).setHours(0, 0, 0, 0);
  const startTime = start - startDate;
  const endDate = (new Date(end)).setHours(0, 0, 0, 0);
  const endTime = end - endDate;
  return time > startTime || (endDate > startDate && time < endTime);
}

var isBetweenMath = (now, start, end, isDaily) => {
  if (isDaily) {
    if (end - start >= 86400000) {
      return true;
    }
  } else {
    const nowDay = now.getDay();

    if (nowDay < start.getDay() || nowDay > end.getDay()) {
      return false;
    }
  }

  const time = now % 86400000;
  const startTime = start % 86400000;
  const endTime = end % 86400000;
  return time > startTime || ((end - endTime) > (start - startTime) && time < endTime);
}

Tests:

Math
checkRepeated(now1, start_timestamp, end_timestamp, true); checkRepeated(now2, start_timestamp, end_timestamp, true); checkRepeated(now3, start_timestamp, end_timestamp, true); checkRepeated(now4, start_timestamp, end_timestamp, true); checkRepeated(now1, start_timestamp, end_timestamp, false); checkRepeated(now2, start_timestamp, end_timestamp, false); checkRepeated(now3, start_timestamp, end_timestamp, false); checkRepeated(now4, start_timestamp, end_timestamp, false);
Date Manipulation
isBetween(now1, start_timestamp, end_timestamp, true); isBetween(now2, start_timestamp, end_timestamp, true); isBetween(now3, start_timestamp, end_timestamp, true); isBetween(now4, start_timestamp, end_timestamp, true); isBetween(now1, start_timestamp, end_timestamp, false); isBetween(now2, start_timestamp, end_timestamp, false); isBetween(now3, start_timestamp, end_timestamp, false); isBetween(now4, start_timestamp, end_timestamp, false);
More Math
isBetweenMath(now1, start_timestamp, end_timestamp, true); isBetweenMath(now2, start_timestamp, end_timestamp, true); isBetweenMath(now3, start_timestamp, end_timestamp, true); isBetweenMath(now4, start_timestamp, end_timestamp, true); isBetweenMath(now1, start_timestamp, end_timestamp, false); isBetweenMath(now2, start_timestamp, end_timestamp, false); isBetweenMath(now3, start_timestamp, end_timestamp, false); isBetweenMath(now4, start_timestamp, end_timestamp, false);

Run results for: Daily/Weekly using Date vs Math

Math

Date Manipulation

More Math