Why does the openapi java generator serialize LocalDate as an array instead of a complete date?

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The OpenAPI Java generator serializes LocalDate as an array instead of a complete date because that is the default behavior for JSON serialization in Jackson, the library used by the generator.

According to the JSON specification, a string representing a date must follow the ISO 8601 standard format. However, there are multiple ways to represent a date in JSON, and the generator chooses to use the array format because it is more flexible and can handle dates with different levels of precision.

For example, a date represented as an array can include additional elements for hours, minutes, and seconds, whereas a string in ISO 8601 format only includes the date.

Additionally, using an array allows for easier parsing of the date in different programming languages and frameworks. Overall, the decision to use an array format for LocalDate serialization is a practical choice that balances flexibility and compatibility with standard JSON conventions.