MongoDB DateTime Java vs .Net

We have an class in .Net decorated like this:

    [BsonDateTimeOptions(DateOnly = true, Kind = DateTimeKind.Utc)]
    public DateTime BirthDate { get; set; } 

We only care about the Date. No one really cares what Time or TimeZone they were born in...

We also have java clients reading/storing the data in MongoDb. The 2 drivers are not agreeing on what to save in Mongo and how to deserialize the results. This is causing errors in the application. What is the java equivalent of the above .Net code?