Ok I have a very strange issue. In Netsuite (server side) I am doing the following to convert a non standardized timestamp string provided by netsuite to a JS Date object:

function nsStringToDate(str) {
    var regex = /(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})/;
    var match = regex.exec(str);
    var date = new Date();
    date.setFullYear(parseInt(match[1]), parseInt(match[2]) - 1, parseInt(match[3]));
    date.setHours(parseInt(match[4]), parseInt(match[5]), parseInt(match[6]), 0);
    return date.toISOString();
  }

For some reason I seem to get a

Date is invalid

error on the

return date.toISOString()

. Even though the inputs are ether

2020-05-10T05:13:01

or

2020-07-09T05:13:01

any idea why this could be?