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Converting 12 hour format time to 24 hour format in JavaScript
We are required to write a JavaScript function that takes in a time string in the following format −
const timeStr = '05:00 PM';
Note that the string will always be of the same format i.e.
HH:MM mm
Our function should make some computations on the string received and then return the corresponding 24 hour time in the following format: HH:MM
For example:
For the above string, the output should be −
const output = '17:00';
Example
The code for this will be −
const timeStr = '05:00 PM';
const secondTimeStr = '11:42 PM';
const convertTime = timeStr => {
const [time, modifier] = timeStr.split(' ');
let [hours, minutes] = time.split(':');
if (hours === '12') {
hours = '00';
}
if (modifier === 'PM') {
hours = parseInt(hours, 10) + 12;
}
return `${hours}:${minutes}`;
};
console.log(convertTime(timeStr));
console.log(convertTime(secondTimeStr));Output
And the output in the console will be −
17:00 23:42
Updated on: 22-Feb-2021
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