There is no one "right" JSON date format. However, the most common and recommended format is the ISO 8601 format. The ISO 8601 format is a standard format for representing dates and times. It is widely used in the computer industry and is supported by most JSON parsers.

The ISO 8601 format for dates is as follows:

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YYYY-MM-DD

For example, the date "May 15, 2023" would be represented in the ISO 8601 format as follows:

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2023-05-15

The ISO 8601 format for times is as follows:

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HH:mm:ss.SSS

For example, the time "12:00:00.000" would be represented in the ISO 8601 format as follows:

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12:00:00.000

The ISO 8601 format for dates and times is as follows:

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YYYY-MM-DDTHH:mm:ss.SSSZ

For example, the date and time "May 15, 2023 at 12:00:00.000 UTC" would be represented in the ISO 8601 format as follows:

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2023-05-15T12:00:00.000Z

The ISO 8601 format is a human-readable and machine-readable format. It is also a widely used format, which makes it easy to exchange data with other systems.