Rsa97

sign = Math.sign(number)
abs = Math.abs(number)
for (let i = 0; i <= abs; i += 3) {
  three.push(i * sign)
}
for (let i = 0; i <= abs; i += 5) {
  five.push(i * sign)
}

const step3 = number < 0 ? -3 : 3
const three = Array.from(Array(Math.floor(number / step3) + 1), (_, x) => x * step3)
const step5 = number < 0 ? -5 : 5
const five = Array.from(Array(Math.floor(number / step5) + 1), (_, x) => x * step5)

(new Date(endDate).getTime() - new Date(startDate).getTime()) / 1000 / 60 / 60

$('body').on('click', '.get-modal-product', function () {

for (var section in data) {
  for (var key in data[section]) {
    ...
  }
}