Check if a date string is in ISO and UTC format

I have a string with this format 2018-02-26T23:10:00.780Z I would like to check if it's in ISO8601 and UTC format.

let date= '2011-10-05T14:48:00.000Z';
const error;
var dateParsed= Date.parse(date);
if(dateParsed.toISOString()==dateParsed && dateParsed.toUTCString()==dateParsed) {
  return  date;
}
else  {
  throw new BadRequestException('Validation failed');
}

The problems here are:

• I don't catch to error message
• Date.parse() change the format of string date to 1317826080000 so to could not compare it to ISO or UTC format.

I would avoid using libraries like moment.js

Try this - you need to actually create a date object rather than parsing the string

NOTE: This will test the string AS YOU POSTED IT.

YYYY-MM-DDTHH:MN:SS.MSSZ

It will fail on valid ISO8601 dates like

• Date: 2018-10-18
• Combined date and time in UTC: 2018-10-18T08:04:30+00:00 (without the Z and TZ in 00:00)
• 2018-10-18T08:04:30Z
• 20181018T080430Z
• Week: 2018-W42
• Date with week number: 2018-W42-4
• Date without year: --10-18 (last in ISO8601:2000, in use by RFC 6350[2])
• Ordinal date: 2018-291

It will no longer accept INVALID date strings

function isIsoDate(str) {
  if (!/\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z/.test(str)) return false;
  const d = new Date(str); 
  return !isNaN(d.getTime()) && d.toISOString()===str; // valid date 
}

console.log(isIsoDate('2011-10-05T14:48:00.000Z')); // correct according to your spec

console.log(isIsoDate('2018-11-10T11:22:33+00:00')); // correct date string but does not use Z

console.log(isIsoDate('2011-10-05T14:99:00.000Z')); // invalid time part