diff --git a/src/scalars/datetime.rs b/src/scalars/datetime.rs
index 31de70f7..855970c8 100644
--- a/src/scalars/datetime.rs
+++ b/src/scalars/datetime.rs
@@ -1,15 +1,32 @@
 use crate::{InputValueError, InputValueResult, ScalarType, Value};
 use async_graphql_derive::Scalar;
-use chrono::{DateTime, FixedOffset, Utc};
+use chrono::{DateTime, FixedOffset, Local, Utc};
 
 /// Implement the DateTime<FixedOffset> scalar
 ///
 /// The input/output is a string in RFC3339 format.
-#[Scalar(internal, name = "DateTimeFixedOffset")]
+#[Scalar(internal, name = "DateTime")]
 impl ScalarType for DateTime<FixedOffset> {
     fn parse(value: Value) -> InputValueResult<Self> {
         match &value {
-            Value::String(s) => Ok(DateTime::parse_from_rfc3339(s)?),
+            Value::String(s) => Ok(s.parse::<DateTime<FixedOffset>>()?),
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::String(self.to_rfc3339())
+    }
+}
+
+/// Implement the DateTime<Local> scalar
+///
+/// The input/output is a string in RFC3339 format.
+#[Scalar(internal, name = "DateTime")]
+impl ScalarType for DateTime<Local> {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match &value {
+            Value::String(s) => Ok(s.parse::<DateTime<Local>>()?),
             _ => Err(InputValueError::ExpectedType(value)),
         }
     }
@@ -22,7 +39,7 @@ impl ScalarType for DateTime<FixedOffset> {
 /// Implement the DateTime<Utc> scalar
 ///
 /// The input/output is a string in RFC3339 format.
-#[Scalar(internal, name = "DateTimeUtc")]
+#[Scalar(internal, name = "DateTime")]
 impl ScalarType for DateTime<Utc> {
     fn parse(value: Value) -> InputValueResult<Self> {
         match &value {
diff --git a/src/scalars/floats.rs b/src/scalars/floats.rs
index 04adacc1..1aae5207 100644
--- a/src/scalars/floats.rs
+++ b/src/scalars/floats.rs
@@ -1,35 +1,52 @@
 use crate::{InputValueError, InputValueResult, ScalarType, Value};
 use async_graphql_derive::Scalar;
 
-macro_rules! float_scalar {
-    ($($ty:ty),*) => {
-        $(
-        /// The `Float` scalar type represents signed double-precision fractional values as specified by [IEEE 754](https://en.wikipedia.org/wiki/IEEE_floating_point).
-        #[Scalar(internal, name = "Float")]
-        impl ScalarType for $ty {
-            fn parse(value: Value) -> InputValueResult<Self> {
-                match value {
-                    Value::Number(n) => Ok(n
-                        .as_f64()
-                        .ok_or_else(|| InputValueError::from("Invalid number"))?
-                        as Self),
-                    _ => Err(InputValueError::ExpectedType(value)),
-                }
-            }
-
-            fn is_valid(value: &Value) -> bool {
-                match value {
-                    Value::Number(_) => true,
-                    _ => false,
-                }
-            }
-
-            fn to_value(&self) -> Value {
-                Value::Number(serde_json::Number::from_f64(*self as f64).unwrap())
-            }
+/// The `Float` scalar type represents signed double-precision fractional values as specified by [IEEE 754](https://en.wikipedia.org/wiki/IEEE_floating_point).
+#[Scalar(internal, name = "Float")]
+impl ScalarType for f32 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => Ok(n
+                .as_f64()
+                .ok_or_else(|| InputValueError::from("Invalid number"))?
+                as Self),
+            _ => Err(InputValueError::ExpectedType(value)),
         }
-        )*
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(_) => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from_f64(*self as f64).unwrap())
     }
 }
 
-float_scalar!(f32, f64);
+/// The `Float` scalar type represents signed double-precision fractional values as specified by [IEEE 754](https://en.wikipedia.org/wiki/IEEE_floating_point).
+#[Scalar(internal, name = "Float")]
+impl ScalarType for f64 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => Ok(n
+                .as_f64()
+                .ok_or_else(|| InputValueError::from("Invalid number"))?
+                as Self),
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(_) => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from_f64(*self as f64).unwrap())
+    }
+}
diff --git a/src/scalars/integers.rs b/src/scalars/integers.rs
index 13d2dc61..e7a32c93 100644
--- a/src/scalars/integers.rs
+++ b/src/scalars/integers.rs
@@ -1,85 +1,274 @@
 use crate::{InputValueError, InputValueResult, ScalarType, Value};
 use async_graphql_derive::Scalar;
 
-macro_rules! int_scalar {
-    ($($ty:ty),*) => {
-        $(
-        /// The `Int` scalar type represents non-fractional whole numeric values.
-        #[Scalar(internal, name = "Int")]
-        impl ScalarType for $ty {
-            fn parse(value: Value) -> InputValueResult<Self> {
-                match value {
-                    Value::Number(n) => {
-                        let n = n
-                            .as_i64()
-                            .ok_or_else(|| InputValueError::from("Invalid number"))?;
-                        if n < Self::MIN as i64 || n > Self::MAX as i64 {
-                            return Err(InputValueError::from(format!(
-                                "Only integers from {} to {} are accepted.",
-                                Self::MIN,
-                                Self::MAX
-                            )));
-                        }
-                        Ok(n as Self)
-                    }
-                    _ => Err(InputValueError::ExpectedType(value)),
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for i8 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_i64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n < Self::MIN as i64 || n > Self::MAX as i64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        Self::MIN,
+                        Self::MAX
+                    )));
                 }
+                Ok(n as Self)
             }
-
-            fn is_valid(value: &Value) -> bool {
-                match value {
-                    Value::Number(n) if n.is_i64() => true,
-                    _ => false,
-                }
-            }
-
-            fn to_value(&self) -> Value {
-                Value::Number(serde_json::Number::from(*self as i64))
-            }
+            _ => Err(InputValueError::ExpectedType(value)),
         }
-        )*
-    };
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_i64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as i64))
+    }
 }
 
-macro_rules! uint_scalar {
-    ($($ty:ty),*) => {
-        $(
-        /// The `Int` scalar type represents non-fractional whole numeric values.
-        #[Scalar(internal, name = "Int")]
-        impl ScalarType for $ty {
-            fn parse(value: Value) -> InputValueResult<Self> {
-                match value {
-                    Value::Number(n) => {
-                        let n = n
-                            .as_u64()
-                            .ok_or_else(|| InputValueError::from("Invalid number"))?;
-                        if n > Self::MAX as u64 {
-                            return Err(InputValueError::from(format!(
-                                "Only integers from {} to {} are accepted.",
-                                0,
-                                Self::MAX
-                            )));
-                        }
-                        Ok(n as Self)
-                    }
-                    _ => Err(InputValueError::ExpectedType(value)),
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for i16 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_i64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n < Self::MIN as i64 || n > Self::MAX as i64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        Self::MIN,
+                        Self::MAX
+                    )));
                 }
+                Ok(n as Self)
             }
-
-            fn is_valid(value: &Value) -> bool {
-                match value {
-                    Value::Number(n) if n.is_u64() => true,
-                    _ => false,
-                }
-            }
-
-            fn to_value(&self) -> Value {
-                Value::Number(serde_json::Number::from(*self as u64))
-            }
+            _ => Err(InputValueError::ExpectedType(value)),
         }
-        )*
-    };
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_i64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as i64))
+    }
 }
 
-int_scalar!(i8, i16, i32, i64);
-uint_scalar!(u8, u16, u32, u64);
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for i32 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_i64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n < Self::MIN as i64 || n > Self::MAX as i64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        Self::MIN,
+                        Self::MAX
+                    )));
+                }
+                Ok(n as Self)
+            }
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_i64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as i64))
+    }
+}
+
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for i64 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_i64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n < Self::MIN as i64 || n > Self::MAX as i64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        Self::MIN,
+                        Self::MAX
+                    )));
+                }
+                Ok(n as Self)
+            }
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_i64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as i64))
+    }
+}
+
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for u8 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_u64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n > Self::MAX as u64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        0,
+                        Self::MAX
+                    )));
+                }
+                Ok(n as Self)
+            }
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_u64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as u64))
+    }
+}
+
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for u16 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_u64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n > Self::MAX as u64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        0,
+                        Self::MAX
+                    )));
+                }
+                Ok(n as Self)
+            }
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_u64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as u64))
+    }
+}
+
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for u32 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_u64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n > Self::MAX as u64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        0,
+                        Self::MAX
+                    )));
+                }
+                Ok(n as Self)
+            }
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_u64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as u64))
+    }
+}
+
+/// The `Int` scalar type represents non-fractional whole numeric values.
+#[Scalar(internal, name = "Int")]
+impl ScalarType for u64 {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::Number(n) => {
+                let n = n
+                    .as_u64()
+                    .ok_or_else(|| InputValueError::from("Invalid number"))?;
+                if n > Self::MAX as u64 {
+                    return Err(InputValueError::from(format!(
+                        "Only integers from {} to {} are accepted.",
+                        0,
+                        Self::MAX
+                    )));
+                }
+                Ok(n as Self)
+            }
+            _ => Err(InputValueError::ExpectedType(value)),
+        }
+    }
+
+    fn is_valid(value: &Value) -> bool {
+        match value {
+            Value::Number(n) if n.is_u64() => true,
+            _ => false,
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::Number(serde_json::Number::from(*self as u64))
+    }
+}
diff --git a/src/scalars/mod.rs b/src/scalars/mod.rs
index 2cf2e585..d6081810 100644
--- a/src/scalars/mod.rs
+++ b/src/scalars/mod.rs
@@ -25,7 +25,7 @@ mod tests {
     use super::ID;
     use crate::Type;
     use bson::oid::ObjectId;
-    use chrono::{DateTime, FixedOffset, NaiveDate, NaiveTime, Utc};
+    use chrono::{DateTime, FixedOffset, Local, NaiveDate, NaiveTime, Utc};
     use uuid::Uuid;
 
     #[test]
@@ -54,19 +54,22 @@ mod tests {
         assert_eq!(<NaiveTime as Type>::type_name(), "NaiveTime");
         assert_eq!(<NaiveTime as Type>::qualified_type_name(), "NaiveTime!");
 
-        assert_eq!(<DateTime::<Utc> as Type>::type_name(), "DateTimeUtc");
+        assert_eq!(<DateTime::<Utc> as Type>::type_name(), "DateTime");
         assert_eq!(
             <DateTime::<Utc> as Type>::qualified_type_name(),
-            "DateTimeUtc!"
+            "DateTime!"
         );
 
+        assert_eq!(<DateTime::<Local> as Type>::type_name(), "DateTime");
         assert_eq!(
-            <DateTime::<FixedOffset> as Type>::type_name(),
-            "DateTimeFixedOffset"
+            <DateTime::<Local> as Type>::qualified_type_name(),
+            "DateTime!"
         );
+
+        assert_eq!(<DateTime::<FixedOffset> as Type>::type_name(), "DateTime");
         assert_eq!(
             <DateTime::<FixedOffset> as Type>::qualified_type_name(),
-            "DateTimeFixedOffset!"
+            "DateTime!"
         );
 
         assert_eq!(<Uuid as Type>::type_name(), "UUID");