The valid and readable date format in Korean is "YYYY년 MM월 DD일", but {{#Property}} and {{#Statements}} returns dates in the format of "DD MM YYYY". These are just numbers to Koreans and it seems very difficult to be considered a date.
Examples
* {{#Property:P571|from=Q2013}} → 30 10 2012
* {{#Statements:P571|from=Q2013}} → 30 10 2012Same in both https://ko.wikipedia.org/wiki/User:Lens0021/sandbox?oldid=29359462 and https://ko.wikipedia.org/wiki/User:Lens0021/sandbox?oldid=29359462&uselang=ko
Changing the language settings in preferences of the wiki and in-browser settings does not change anything. I think this issue exists in other languages too.
See also: T63958: Use existing $dateFormats to format dates on Wikidata