How to declare date format as yyyy-mm-dd snd other date format entered by user in postman as invalid in node. Js API.

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Java

API changes to declare a yyyy-mm-dd as valid and all other format entered by user in postman as invalid in node. Js API

What I have tried:

Yes . Function isValidDate() {
isValidDate. Default Format='yyyy-mm-dd';
}
If(date==defaultFormat) {
}else{
("Invalid format") ;