From 2975a21ed6b57ea97427c31a297c368fb1ce35de Mon Sep 17 00:00:00 2001
From: Cosmos Nicolaou <cosmos.nicolaou@gmail.com>
Date: Fri, 16 Dec 2022 10:58:33 -0800
Subject: [PATCH] openapi3: patch YAML serialization of dates (#698)

Co-authored-by: Pierre Fenoll <pierrefenoll@gmail.com>
---
 openapi3/issue697_test.go      | 15 +++++++++++++++
 openapi3/schema.go             | 10 +++++++++-
 openapi3/testdata/issue697.yml | 14 ++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 openapi3/issue697_test.go
 create mode 100644 openapi3/testdata/issue697.yml

diff --git a/openapi3/issue697_test.go b/openapi3/issue697_test.go
new file mode 100644
index 000000000..c7317584a
--- /dev/null
+++ b/openapi3/issue697_test.go
@@ -0,0 +1,15 @@
+package openapi3
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIssue697(t *testing.T) {
+	loader := NewLoader()
+	doc, err := loader.LoadFromFile("testdata/issue697.yml")
+	require.NoError(t, err)
+	err = doc.Validate(loader.Context)
+	require.NoError(t, err)
+}
diff --git a/openapi3/schema.go b/openapi3/schema.go
index c5af8536e..41ccaafef 100644
--- a/openapi3/schema.go
+++ b/openapi3/schema.go
@@ -12,6 +12,7 @@ import (
 	"regexp"
 	"sort"
 	"strconv"
+	"strings"
 	"unicode/utf16"
 
 	"github.com/go-openapi/jsonpointer"
@@ -180,7 +181,14 @@ func (schema *Schema) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON sets Schema to a copy of data.
 func (schema *Schema) UnmarshalJSON(data []byte) error {
-	return jsoninfo.UnmarshalStrictStruct(data, schema)
+	err := jsoninfo.UnmarshalStrictStruct(data, schema)
+	if schema.Format == "date" {
+		// This is a fix for: https://github.com/getkin/kin-openapi/issues/697
+		if eg, ok := schema.Example.(string); ok {
+			schema.Example = strings.TrimSuffix(eg, "T00:00:00Z")
+		}
+	}
+	return err
 }
 
 // JSONLookup implements github.com/go-openapi/jsonpointer#JSONPointable
diff --git a/openapi3/testdata/issue697.yml b/openapi3/testdata/issue697.yml
new file mode 100644
index 000000000..71a4b2ae2
--- /dev/null
+++ b/openapi3/testdata/issue697.yml
@@ -0,0 +1,14 @@
+openapi: 3.0.1
+components:
+  schemas:
+    API:
+      properties:
+        dateExample:
+          type: string
+          format: date
+          example: 2019-09-12
+info:
+  title: sample
+  version: version not set
+paths: {}
+