date_no_time.json

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "description": "A stand-alone date, as represented by the full-date chunk specified in RFC 3339, section 5.6. Dates with no associated time or time-zone data SHOULD be used to represent special legal values, such as date of birth. Implementers SHOULD consider using the standard date_time schema whenever possible instead. Note that this regular expression is not a complete validation: February 31, for example, is allowed, and nothing is known about leap years.",
    "type": "string",
    "format": "paypal_common_date_notime_v1",
    "minLength": 10,
    "maxLength": 10,
    "pattern": "^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$"
}