1 files changed, 35 insertions, 0 deletions
diff --git a/src/dates.rs b/src/dates.rs
new file mode 100644
index 0000000..87e6f5e
--- /dev/null
+++ b/src/dates.rs
@@ -0,0 +1,35 @@
+use async_graphql::{InputValueError, InputValueResult, Scalar, ScalarType, Value};
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct GraphQLDate(pub DateTime<Utc>);
+
+impl From<DateTime<Utc>> for GraphQLDate {
+    fn from(dt: DateTime<Utc>) -> Self {
+        GraphQLDate(dt)
+    }
+}
+
+impl From<GraphQLDate> for DateTime<Utc> {
+    fn from(my_dt: GraphQLDate) -> Self {
+        my_dt.0
+    }
+}
+
+#[Scalar]
+impl ScalarType for GraphQLDate {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        if let Value::String(s) = &value {
+            DateTime::parse_from_rfc3339(s)
+                .map(|dt| GraphQLDate(dt.with_timezone(&Utc)))
+                .map_err(|e| InputValueError::custom(format!("Invalid DateTime: {}", e)))
+        } else {
+            Err(InputValueError::expected_type(value))
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::String(self.0.to_rfc3339())
+    }
+}