Drafts app script to allow insert of current date in ISO 8601 format.

ISO_date.js

// See online documentation for examples
// https://docs.getdrafts.com/docs/actions/scripting
// Add keyboard shortcut Ctrl-Opt-D to insert date in current cursor location 

var today = new Date();
var year = today.getFullYear();
var month = today.getMonth() + 1;
// need to +1 month since Jan = 00
var date = today.getDate();

dd = today.getDate()
if(dd<10) {
    dd='0'+dd
} 

mm = today.getMonth() + 1
if(mm<10) {
    mm='0'+mm
} 

yyyy = today.getFullYear()

var iso_date = yyyy + '-' + mm + '-' + dd ;

var selRange = editor.getSelectedRange();
editor.setSelectedText(iso_date);
editor.setSelectedRange(selRange[0]+iso_date.length, 0);