Javascript date format like ISO but local

Question

how do I format a javascript date like ISO format, but in local time?

with myDate.toISOString() I am getting the time as: \"2012-09-13T19:12:23.826Z\"

Answer 1

I went with what Denis Howe said, below as a ready made function for convenience.

Also one fix: in the original answer t-z does not work because t is a Date, not milliseconds.

function dateToISOLikeButLocal(date) {
    const offsetMs = date.getTimezoneOffset() * 60 * 1000;
    const msLocal =  date.getTime() - offsetMs;
    const dateLocal = new Date(msLocal);
    const iso = dateLocal.toISOString();
    const isoLocal = iso.slice(0, 19);
    return isoLocal;
}

With this I get the kind of string that needed as a URL parameter:

"2018-11-16T12:23:50"