Fastify and Native Date Objects: Regional Time Zone Interoperability

Fastify handles incoming JSON payloads and query strings by passing date-formatted strings directly to the application logic. When using JSON Schema validation with format: 'date-time', the framework ensures the string conforms to ISO 8601, but the actual conversion to a JavaScript Date object typically occurs within the handler or via a custom coercion layer.

Because the native Date constructor relies on the host environment's system time zone, there is a risk of inconsistent data interpretation when deploying the same Fastify application across servers in different geographical regions. This creates uncertainty regarding whether the framework provides a mechanism to enforce a specific time zone during the parsing phase before the data reaches the route handler.

• Does Fastify offer a built-in configuration to standardize the time zone for all incoming date-time strings?
• What is the recommended architectural boundary for implementing time zone normalization to avoid reliance on the host OS locale?