There are systems out there that do YYYY/DD/MM. AFAICT YYYY-DD-MM is only used by evil pranksters, so a date that starts with a 4 digit number and uses dashe

There are systems out there that do YYYY/DD/MM. AFAICT YYYY-DD-MM is only used by evil pranksters, so a date that starts with a 4 digit number and uses dashes is relatively safely assumed as YYYY-MM-DD.