Date

Represents a whole calendar date, for example a date of birth. The time of day and time zone are either specified elsewhere or are not significant. The date is relative to the Proleptic Gregorian Calendar. The date must be a valid calendar date between the year 1 and 9999.

JSON representation 
{
  "year": integer,
  "month": integer,
  "day": integer
}
Fields
year

integer

Year of date. Must be from 1 to 9999.
month

integer

Month of date. Must be from 1 to 12.
day

integer

Day of month. Must be from 1 to 31 and valid for the year and month.