Beginner Series #2 Clock.js

/*
DESCRIPTION:

Clock shows h hours, m minutes and s seconds after midnight.

Your task is to write a function which returns the time since midnight in milliseconds.

Example:
h = 0
m = 1
s = 1

result = 61000
Input constraints:

0 <= h <= 23
0 <= m <= 59
0 <= s <= 59
*/

// My solution:

function past(h, m, s){
    return h * 3600000 + m * 60000 + s * 1000;
  }