diff --git a/CHANGELOG.next.toml b/CHANGELOG.next.toml
index 1832de5613..e07d004d2a 100644
--- a/CHANGELOG.next.toml
+++ b/CHANGELOG.next.toml
@@ -92,3 +92,15 @@ message = "Update the `std::fmt::Debug` implementation for `aws-sigv4::SigningPa
 references = ["smithy-rs#2562"]
 meta = { "breaking" = false, "tada" = true, "bug" = true }
 author = "Velfi"
+
+[[aws-sdk-rust]]
+message = "`aws_smithy_types::date_time::Format` has been re-exported in service client crates."
+references = ["smithy-rs#2534"]
+meta = { "breaking" = false, "tada" = false, "bug" = false }
+author = "ysaito1001"
+
+[[smithy-rs]]
+message = "`aws_smithy_types::date_time::Format` has been re-exported in service client crates."
+references = ["smithy-rs#2534"]
+meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "client" }
+author = "ysaito1001"
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/RuntimeType.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/RuntimeType.kt
index b74fbf2b9a..7e53055195 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/RuntimeType.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/RuntimeType.kt
@@ -278,6 +278,7 @@ data class RuntimeType(val path: String, val dependency: RustDependency? = null)
         fun classifyRetry(runtimeConfig: RuntimeConfig) = smithyHttp(runtimeConfig).resolve("retry::ClassifyRetry")
         fun dateTime(runtimeConfig: RuntimeConfig) = smithyTypes(runtimeConfig).resolve("DateTime")
         fun document(runtimeConfig: RuntimeConfig): RuntimeType = smithyTypes(runtimeConfig).resolve("Document")
+        fun format(runtimeConfig: RuntimeConfig) = smithyTypes(runtimeConfig).resolve("date_time::Format")
         fun retryErrorKind(runtimeConfig: RuntimeConfig) = smithyTypes(runtimeConfig).resolve("retry::ErrorKind")
         fun eventStreamReceiver(runtimeConfig: RuntimeConfig): RuntimeType = smithyHttp(runtimeConfig).resolve("event_stream::Receiver")
         fun eventStreamSender(runtimeConfig: RuntimeConfig): RuntimeType = smithyHttp(runtimeConfig).resolve("event_stream::EventStreamSender")
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/customizations/SmithyTypesPubUseExtra.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/customizations/SmithyTypesPubUseExtra.kt
index ec49a97613..301ee11da8 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/customizations/SmithyTypesPubUseExtra.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/customizations/SmithyTypesPubUseExtra.kt
@@ -58,6 +58,7 @@ private fun pubUseTypesThatShouldBeExported(codegenContext: CodegenContext, mode
         listOf(
             PubUseType(RuntimeType.blob(runtimeConfig), ::hasBlobs),
             PubUseType(RuntimeType.dateTime(runtimeConfig), ::hasDateTimes),
+            PubUseType(RuntimeType.format(runtimeConfig), ::hasDateTimes, "DateTimeFormat"),
         ) + RuntimeType.smithyHttp(runtimeConfig).let { http ->
             listOf(
                 PubUseType(http.resolve("byte_stream::ByteStream"), ::hasStreamingOperations),