How many minutes between two clock times

easyeventsJavaScript

Two timestamps on the same day: return the signed forward distance in minutes, wrapping past midnight.

Both values are minutes since midnight.
If endMinutes is after startMinutes the answer is straightforward.
If endMinutes is at or before startMinutes the interval crosses midnight: add 1440 before subtracting.
Midnight to midnight is 0.

hoursBetween(startMinutes: int, endMinutes: int) → int

Where you start

function hoursBetween(startMinutes, endMinutes) {
  
}

Subtract, then add 1440 if the result is not positive, and take modulo 1440.

Reference solution in JavaScript

function hoursBetween(startMinutes, endMinutes) {
  const diff = endMinutes - startMinutes;
  return ((diff % 1440) + 1440) % 1440;
}