i get this time from an external JSON :
"time":"19:45"
I need to add 2 hours from this string.
Is it possible in JS?
Thanks
Try this
let myTime = '19:45'
function getTime(time, addHour) {
let [h, m] = time.split(':');
let date = new Date();
date.setHours(h, m, 0)
date.toString();
let res = `${date.getHours()+addHour}:${date.getMinutes()}`
return res
}
console.log(getTime( myTime, 2 ))A Date object isn't necessary to do time mathematics, it just means taking account of minutes and seconds (60) and maybe days (24).
E.g.
// Add time to a timestamp, both in in HH:mm format
// If respectDay is true, hours are % 24
function addTime(start, increment, respectDay = false) {
let pad = n => ('0' + n).slice(-2);
let timeToMins = time => time.split(':').reduce((h, m) => h*60 + m*1);
let minsToTime = (mins, respectDay = false) => `${pad((mins / 60 | 0) % (respectDay? 24 : Number.POSITIVE_INFINITY))}:${pad(mins%60)}`;
return minsToTime(timeToMins(start) + timeToMins(increment), respectDay);
}
let time = "19:45";
console.log(addTime(time, '8:23')); // Total time : 28:08
console.log(addTime(time, '8:23', true)); // As day time : 04:08uses String.split to get hourNum and minuteNum, then construct one Date object and uses setTime to add two hours.
function addHours(text, hours=2) {
const [hourNum, minNum] = text.split(':')
const time = new Date(0, 0, 0, hourNum, minNum)
time.setTime(time.getTime() + (hours * 60 * 60 * 1000))
return `${time.getHours()}:${time.getMinutes()}`
}
console.log(addHours('19:45', 2))
console.log(addHours('23:45', 2))