I'll try to set a date field within a SharePoint 2016 new-, or edit form via jQuery.
Works fine so far:
fieldJqueryObject.find('input[type="text"]').val('08/28/2019')
The problem: It works only if I send the string according to the format set up in the site settings (here: MM/DD/YYYY). If, for instance, I use the German format in regional settings (DD.MM.YYYY) it won't work if I write the english value in the field.
Of course, reading the value also is a problem. Can I retrieve the date/time format via REST API or something like that?