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Differential formats for serde.

Modules

Use the well-known ISO 8601 format when serializing and deserializing an OffsetDateTime.
Use the well-known RFC2822 format when serializing and deserializing an OffsetDateTime.
Use the well-known RFC3339 format when serializing and deserializing an OffsetDateTime.
Treat an OffsetDateTime as a Unix timestamp for the purposes of serde.