Here is the time:
01:02:25,369
I want to subtract 10 seconds from it, so the return value should be:
01:02:15,369
I know I have to write a function to do so, but things get difficult when seconds are <10 so you have to subtract minutes and hours as well.
You could just convert it to milliseconds and then add or subtract however much you want. And then make a render function to convert it back into a string if you need it.
function getTotalMS(timeString) {
const [hms, ms] = timeString.split(',');
const [h, m, s] = hms.split(':');
return parseInt(ms) * 1 +
parseInt(s) * 1000 +
parseInt(m) * 60 * 1000 +
parseInt(h) * 60 * 60 * 1000;
}
function renderTime(ms) {
const h = Math.floor(ms / (60 * 60 * 1000)); ms -= h * 60 * 60 * 1000;
const m = Math.floor(ms / (60 * 1000)); ms -= m * 60 * 1000;
const s = Math.floor(ms / (1000)); ms -= s * 1000;
return `${h<10?'0':''}${h}:${m<10?'0':''}${m}:${s<10?'0':''}${s},${ms}`;
}
// subtracting 10 seconds
let totalTime = getTotalMS('01:02:25,369');
totalTime -= 10 * 1000;
console.log(renderTime(totalTime));probably could be optimized, but here's a starting point