I have specific DateTime values in this format 'YYYY-MM-DDThh:mm:ss.ms' (e.g. '2022-05-10T13:44:00.0000000') and I need to convert them to local DateTime (which is UTC+2 for me) without changing the format (so '2022-05-10T15:44:00.0000000' is the desired result (even better would be without the milliseconds but that would just be the icing on the cake)).
I've searched far and wide but every alleged solution I find either changes the format or doesn't change the time at all.
This is what I have right now, it successfully converts the time to local time but by running it through .toISOString() to get the original format back it converts it back to UTC time.
//Input: event.start.dateTime = '2022-05-10T13:44:00.0000000'
let startDateTime = new Date(event.start.dateTime);
startDateTime.setMinutes(startDateTime.getMinutes() -
startDateTime.getTimezoneOffset());
document.getElementById('ev-start').value =
startDateTime.toISOString().slice(0,16);
//Output: '2022-05-10T13:44:00.000Z'
I couldn't find a clean and satisfying solution so I decided to just to the formatting myself. Here's what I ended up with:
Input: '2022-05-10T13:44:00.0000000'
let startDateTime = new Date(event.start.dateTime);
startDateTime.setMinutes(startDateTime.getMinutes() -
startDateTime.getTimezoneOffset());
let localStartDateTime = startDateTime.getFullYear() + "-" +
(startDateTime.getMonth() + 1).toString().padStart(2, '0') +
"-" + startDateTime.getDate().toString().padStart(2, '0') +
"T" + startDateTime.getHours().toString().padStart(2, '0') +
":" + startDateTime.getMinutes().toString().padStart(2, '0')
+ ":" +
startDateTime.getSeconds().toString().padStart(2, '0');
document.getElementById('ev-start').value =
localStartDateTime;
Output: '2022-05-10T15:44:00'
Hope this helps
const startDateTime = new Date('2022-05-10T13:44:00.0000000');
const outputDateTime = new Date(startDateTime.toString()).toISOString().slice(0, 19);
//document.getElementById('ev-start').value = outputDateTime
console.log(outputDateTime);