Date parsing actually does vary by the JavaScript engine, and there are very few formats (only three, actually) which work consistently across all browsers and JS engines: https://www.geeksforgeeks.org/javascript-date-formats/ Each JavaScript engine may support additional formats, but they will not be universally supported. So if you need to deal with a different format, your best bet is to either parse it yourself, or use a library like

moment.js

as ns_dev suggested. With that, you can specify the incoming format, and be sure the parsing will work reliably every time.