Date format in the Rest API - Assign a Metadata Collection to a Folder

Summary

Date format in the Rest API - Assign a Metadata Collection to a Folder

Content

I am trying to use this Rest API -Assign a Metadata Collection to a Folder

https://docs.oracle.com/en/cloud/paas/content-cloud/rest-api-documents/op-documents-api-1.2-folders-folderid-metadata-collectionname-post.html .

to assign metadata tags to a folder. I am using a date Type and the date type is defined as "mm/dd/yyyy"

and in my rest api post body i am sending the info as

{
    "collection": "XXXX"
    "**** Number": "1220",
    "**** Date": "12/12/2018"
}

It is erroring out saying it is an invalid date format although the format i am sending seems to be correct. Any Pointers please.