@Matt (pactflow.io / pact-js / pact-go) am I misunderstanding something on how pact does these matcher verification, perhaps? 🤔

So for clarity, your local Pact consumer test expects a format

dd/MM/yyyy

and the consumer test works, and you’re expecting it to fail on the provider side because the format doesn’t match?

That is probably the default format for dates in your locale

For the moment of my contract generation, I don’t have any specific assertion for the date type, however this is specified in the expected body with

.date("19/08/2016", "dd/MM/YYYY", new Date())

@Pact(provider = PACT_PROVIDER, consumer = PACT_CONSUMER)
public RequestResponsePact createPact(PactDslWithProvider builder) {
    headers.put("Content-Type", "application/json");
    headers.put("Accept", "application/json");

    DslPart bodyReturned = PactDslJsonArray.arrayEachLike(2)
            .uuid("client_id", clientId)
            .uuid("purchase_id", randomUUID())
            .numberType("value", 1234)
            .date("19/08/2016", "dd/MM/YYYY", new Date())
            .stringType("card_number", "**** **** **** 1234")
            .close();

    return builder
            .given("A request to retrieve the history of transactions for a client")
            .uponReceiving("A request to retrieve the history of transactions for a client")
            .pathFromProviderState(path + "${clientId}", path + clientId)
            .method(String.valueOf(GET))
            .headers(headers)
            .willRespondWith()
            .body(bodyReturned)
            .status(200)
            .toPact();
}