These are JavaScript functions I made for converting military-time to minutes, and vice versa.

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1function militaryToMinutes(string) {
2  let h = Number(string.match(/[^:]+/)); //match first 1 or 2 numbers
3  let m = Number(string.match(/(?<=:)../)); //match last 2 numbers
4  return h * 60 + m;
5}
6
7function minutesToMilitary(num) {
8  let h = Math.floor(num / 60);
9  let m = num % 60;
10  if (m < 10) {
11    //if a zero is needed for military time
12    let f = "0";
13    m = f + `${m}`;
14  }
15  return `${h}:${m}`;
16}
17
18militaryToMinutes("10:00"); //600
19
20minutesToMilitary(600); //'10:00'