OpenApi Spring Boot - Show date as yyyyMMdd

In my request model, I have a field like

@NotNull
@Schema(example = "19680228", type = "String", format = "yyyyMMdd", pattern = "([0-9]{4})(?:[0-9]{2})([0-9]{2})", required = true, nullable = false)
@JsonDeserialize(using = CustomDateDeserializer.class)
private OffsetDateTime birthDate;

Birthday is of OffsetDateTime type, however, request coming in contains only date portion in format yyyyMMdd. This is requirement and cannot be changed. And this is OK, I already take care of that with my CustomDateDeserializer and it is all working fine.

Based on OpenAPI documentation and post @ https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#data-types, https://stackoverflow.com/questions/49379006/what-is-the-correct-way-to-declare-a-date-in-an-openapi-swagger-file, I know that OpenAPI supports ISO8601 date and date-time, in which case, no pattern is needed, and type should be provided as date or date-time.

However, in case you require some other format, the documentation states that type should be String, format should specify which format the date is in, and pattern should be provided as regex.

And this is exactly what I am doing in the above @Schema annotation.

However, when I go to https://editor.swagger.io/ and paste my .yaml file into it, the API generated for both my request model and my controller still contain incorrect formatting for birthdate and the example is not even taken into consideration:

Here is how it shows in my model:

As you can see, the format is still getting the format for OffsetDateTime and there is no example at all.

Same for my controller:

enter image description here

How do I make birthday show up as yyyyMMdd? For example, how to make it show as 19720226 in swagger editor?

I am using OpenApi/Swagger 3 in a Spring Boot application.

Q&A (please complete the following information)

• OS: Windows
• Browser: Chrome, Firefox, Brave, Edge
• Version: OpenApi/Swagger 3
• Method of installation: Spring Boot maven
• Swagger-UI version: OpenApi/Swagger 3
• Swagger/OpenAPI version: OpenApi/Swagger 3

Content & configuration

Swagger-UI configuration options:
No configuration has changed, all default. I dont know where to change it even.

Describe the bug you're encountering

described above

To reproduce...

Steps to reproduce the behavior:
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Expected behavior

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Screenshots

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Additional context or thoughts

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Start in Swagger Editor and Swagger UI with a minimal OpenAPI document reproducing the OffsetDateTime field, since the original YAML is unavailable. Compare how the schema's type, format, pattern, and example are represented for the model and controller. Done means the reproduced schema displays the requested yyyyMMdd format and example consistently.