diff --git a/Directory.Build.props b/Directory.Build.props
index b89cfa1..e065ef6 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <VersionPrefix>2.7.0</VersionPrefix>
+    <VersionPrefix>2.8.0</VersionPrefix>
     <LangVersion>11.0</LangVersion>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
@@ -33,7 +33,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <FacilityVersion>2.10.1</FacilityVersion>
+    <FacilityVersion>2.11.0</FacilityVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index f112455..41ef3ba 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -1,5 +1,9 @@
 # Release Notes
 
+## 2.8.0
+
+* Support `datetime`.
+
 ## 2.7.0
 
 * Support `extern` data and enum types.
diff --git a/conformance/ConformanceApi.fsd b/conformance/ConformanceApi.fsd
index e51d494..ff35857 100644
--- a/conformance/ConformanceApi.fsd
+++ b/conformance/ConformanceApi.fsd
@@ -149,14 +149,13 @@ service ConformanceApi
 		int32: int32;
 		int64: int64;
 		decimal: decimal;
-
-		[validate]
-		enum: Answer;
+		[validate] enum: Answer;
+		datetime: datetime;
 	}:
 	{
 	}
 
-	[http(method: GET, path: "/checkPath/{string}/{boolean}/{double}/{int32}/{int64}/{decimal}/{enum}")]
+	[http(method: GET, path: "/checkPath/{string}/{boolean}/{double}/{int32}/{int64}/{decimal}/{enum}/{datetime}")]
 	method checkPath
 	{
 		string: string;
@@ -165,9 +164,8 @@ service ConformanceApi
 		int32: int32;
 		int64: int64;
 		decimal: decimal;
-
-		[validate]
-		enum: Answer;
+		[validate] enum: Answer;
+		datetime: datetime;
 	}:
 	{
 	}
@@ -182,6 +180,7 @@ service ConformanceApi
 		[http(from: header)] int64: int64;
 		[http(from: header)] decimal: decimal;
 		[http(from: header)] enum: Answer;
+		[http(from: header)] datetime: datetime;
 	}:
 	{
 		[http(from: header)] string: string;
@@ -191,6 +190,7 @@ service ConformanceApi
 		[http(from: header)] int64: int64;
 		[http(from: header)] decimal: decimal;
 		[http(from: header)] enum: Answer;
+		[http(from: header)] datetime: datetime;
 	}
 
 	[http(path: "/mixed/{path}")]
@@ -261,6 +261,7 @@ service ConformanceApi
 		int32: int32;
 		int64: int64;
 		decimal: decimal;
+		datetime: datetime;
 		bytes: bytes;
 		object: object;
 		error: error;
@@ -280,6 +281,7 @@ service ConformanceApi
 		int32: int32[];
 		int64: int64[];
 		decimal: decimal[];
+		datetime: datetime[];
 		bytes: bytes[];
 		object: object[];
 		error: error[];
@@ -299,6 +301,7 @@ service ConformanceApi
 		int32: map<int32>;
 		int64: map<int64>;
 		decimal: map<decimal>;
+		datetime: map<datetime>;
 		bytes: map<bytes>;
 		object: map<object>;
 		error: map<error>;
@@ -318,6 +321,7 @@ service ConformanceApi
 		int32: result<int32>;
 		int64: result<int64>;
 		decimal: result<decimal>;
+		datetime: result<datetime>;
 		bytes: result<bytes>;
 		object: result<object>;
 		error: result<error>;
@@ -337,6 +341,7 @@ service ConformanceApi
 		int32: nullable<int32>;
 		int64: nullable<int64>;
 		decimal: nullable<decimal>;
+		datetime: nullable<datetime>;
 		bytes: nullable<bytes>;
 		object: nullable<object>;
 		error: nullable<error>;
diff --git a/conformance/http/ConformanceApi.md b/conformance/http/ConformanceApi.md
index eb48259..b28641c 100644
--- a/conformance/http/ConformanceApi.md
+++ b/conformance/http/ConformanceApi.md
@@ -12,7 +12,7 @@ API for a Facility test server.
 | [getWidgetBatch](ConformanceApi/getWidgetBatch.md) | `POST /widgets/get` | Gets the specified widgets. |
 | [mirrorFields](ConformanceApi/mirrorFields.md) | `POST /mirrorFields` |  |
 | [checkQuery](ConformanceApi/checkQuery.md) | `GET /checkQuery` |  |
-| [checkPath](ConformanceApi/checkPath.md) | `GET /checkPath/{string}/{boolean}/{double}/{int32}/{int64}/{decimal}/{enum}` |  |
+| [checkPath](ConformanceApi/checkPath.md) | `GET /checkPath/{string}/{boolean}/{double}/{int32}/{int64}/{decimal}/{enum}/{datetime}` |  |
 | [mirrorHeaders](ConformanceApi/mirrorHeaders.md) | `GET /mirrorHeaders` |  |
 | [mixed](ConformanceApi/mixed.md) | `POST /mixed/{path}` |  |
 | [required](ConformanceApi/required.md) | `POST /required` |  |
diff --git a/conformance/http/ConformanceApi/Any.md b/conformance/http/ConformanceApi/Any.md
index c044b98..d548150 100644
--- a/conformance/http/ConformanceApi/Any.md
+++ b/conformance/http/ConformanceApi/Any.md
@@ -8,6 +8,7 @@
   "int32": (integer),
   "int64": (integer),
   "decimal": (number),
+  "datetime": "(date/time)",
   "bytes": "(base64)",
   "object": { ... },
   "error": { "code": ... },
@@ -28,6 +29,7 @@
 | int32 | int32 |  |
 | int64 | int64 |  |
 | decimal | decimal |  |
+| datetime | datetime |  |
 | bytes | bytes |  |
 | object | object |  |
 | error | error |  |
diff --git a/conformance/http/ConformanceApi/AnyArray.md b/conformance/http/ConformanceApi/AnyArray.md
index ed59c3e..373adc3 100644
--- a/conformance/http/ConformanceApi/AnyArray.md
+++ b/conformance/http/ConformanceApi/AnyArray.md
@@ -8,6 +8,7 @@
   "int32": [ (integer), ... ],
   "int64": [ (integer), ... ],
   "decimal": [ (number), ... ],
+  "datetime": [ "(date/time)", ... ],
   "bytes": [ "(base64)", ... ],
   "object": [ { ... }, ... ],
   "error": [ { "code": ... }, ... ],
@@ -28,6 +29,7 @@
 | int32 | int32[] |  |
 | int64 | int64[] |  |
 | decimal | decimal[] |  |
+| datetime | datetime[] |  |
 | bytes | bytes[] |  |
 | object | object[] |  |
 | error | error[] |  |
diff --git a/conformance/http/ConformanceApi/AnyMap.md b/conformance/http/ConformanceApi/AnyMap.md
index 5aff939..f752e72 100644
--- a/conformance/http/ConformanceApi/AnyMap.md
+++ b/conformance/http/ConformanceApi/AnyMap.md
@@ -8,6 +8,7 @@
   "int32": { "...": (integer), ... },
   "int64": { "...": (integer), ... },
   "decimal": { "...": (number), ... },
+  "datetime": { "...": "(date/time)", ... },
   "bytes": { "...": "(base64)", ... },
   "object": { "...": { ... }, ... },
   "error": { "...": { "code": ... }, ... },
@@ -28,6 +29,7 @@
 | int32 | map<int32> |  |
 | int64 | map<int64> |  |
 | decimal | map<decimal> |  |
+| datetime | map<datetime> |  |
 | bytes | map<bytes> |  |
 | object | map<object> |  |
 | error | map<error> |  |
diff --git a/conformance/http/ConformanceApi/AnyNullable.md b/conformance/http/ConformanceApi/AnyNullable.md
index a0f21c3..aba692b 100644
--- a/conformance/http/ConformanceApi/AnyNullable.md
+++ b/conformance/http/ConformanceApi/AnyNullable.md
@@ -8,6 +8,7 @@
   "int32": (integer) | null,
   "int64": (integer) | null,
   "decimal": (number) | null,
+  "datetime": "(date/time)" | null,
   "bytes": "(base64)" | null,
   "object": { ... } | null,
   "error": { "code": ... } | null,
@@ -27,6 +28,7 @@
 | int32 | nullable<int32> |  |
 | int64 | nullable<int64> |  |
 | decimal | nullable<decimal> |  |
+| datetime | nullable<datetime> |  |
 | bytes | nullable<bytes> |  |
 | object | nullable<object> |  |
 | error | nullable<error> |  |
diff --git a/conformance/http/ConformanceApi/AnyResult.md b/conformance/http/ConformanceApi/AnyResult.md
index 1aed0be..2ab96d9 100644
--- a/conformance/http/ConformanceApi/AnyResult.md
+++ b/conformance/http/ConformanceApi/AnyResult.md
@@ -8,6 +8,7 @@
   "int32": { "value": (integer) | "error": { "code": ... } },
   "int64": { "value": (integer) | "error": { "code": ... } },
   "decimal": { "value": (number) | "error": { "code": ... } },
+  "datetime": { "value": "(date/time)" | "error": { "code": ... } },
   "bytes": { "value": "(base64)" | "error": { "code": ... } },
   "object": { "value": { ... } | "error": { "code": ... } },
   "error": { "value": { "code": ... } | "error": { "code": ... } },
@@ -28,6 +29,7 @@
 | int32 | result<int32> |  |
 | int64 | result<int64> |  |
 | decimal | result<decimal> |  |
+| datetime | result<datetime> |  |
 | bytes | result<bytes> |  |
 | object | result<object> |  |
 | error | result<error> |  |
diff --git a/conformance/http/ConformanceApi/checkPath.md b/conformance/http/ConformanceApi/checkPath.md
index b9ff030..16f919d 100644
--- a/conformance/http/ConformanceApi/checkPath.md
+++ b/conformance/http/ConformanceApi/checkPath.md
@@ -1,7 +1,7 @@
 # checkPath
 
 ```
-GET /checkPath/{string}/{boolean}/{double}/{int32}/{int64}/{decimal}/{enum}
+GET /checkPath/{string}/{boolean}/{double}/{int32}/{int64}/{decimal}/{enum}/{datetime}
 --- 200 OK
 ```
 
@@ -14,5 +14,6 @@ GET /checkPath/{string}/{boolean}/{double}/{int32}/{int64}/{decimal}/{enum}
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 <!-- DO NOT EDIT: generated by fsdgenmd -->
diff --git a/conformance/http/ConformanceApi/checkQuery.md b/conformance/http/ConformanceApi/checkQuery.md
index f45acde..11c001e 100644
--- a/conformance/http/ConformanceApi/checkQuery.md
+++ b/conformance/http/ConformanceApi/checkQuery.md
@@ -9,6 +9,7 @@ GET /checkQuery
   &int64={int64}
   &decimal={decimal}
   &enum={enum}
+  &datetime={datetime}
 --- 200 OK
 ```
 
@@ -21,5 +22,6 @@ GET /checkQuery
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 <!-- DO NOT EDIT: generated by fsdgenmd -->
diff --git a/conformance/http/ConformanceApi/mirrorHeaders.md b/conformance/http/ConformanceApi/mirrorHeaders.md
index 0f99bbf..5ed4c75 100644
--- a/conformance/http/ConformanceApi/mirrorHeaders.md
+++ b/conformance/http/ConformanceApi/mirrorHeaders.md
@@ -9,6 +9,7 @@ int32: (int32)
 int64: (int64)
 decimal: (decimal)
 enum: (enum)
+datetime: (datetime)
 --- response
 string: (string)
 boolean: (boolean)
@@ -17,6 +18,7 @@ int32: (int32)
 int64: (int64)
 decimal: (decimal)
 enum: (enum)
+datetime: (datetime)
 --- 200 OK
 ```
 
@@ -29,6 +31,7 @@ enum: (enum)
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 | response | type | description |
 | --- | --- | --- |
@@ -39,5 +42,6 @@ enum: (enum)
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 <!-- DO NOT EDIT: generated by fsdgenmd -->
diff --git a/conformance/no-http/ConformanceApi/Any.md b/conformance/no-http/ConformanceApi/Any.md
index 3befac8..617b02d 100644
--- a/conformance/no-http/ConformanceApi/Any.md
+++ b/conformance/no-http/ConformanceApi/Any.md
@@ -8,6 +8,7 @@
 | int32 | int32 |  |
 | int64 | int64 |  |
 | decimal | decimal |  |
+| datetime | datetime |  |
 | bytes | bytes |  |
 | object | object |  |
 | error | error |  |
diff --git a/conformance/no-http/ConformanceApi/AnyArray.md b/conformance/no-http/ConformanceApi/AnyArray.md
index abfb53f..0c04897 100644
--- a/conformance/no-http/ConformanceApi/AnyArray.md
+++ b/conformance/no-http/ConformanceApi/AnyArray.md
@@ -8,6 +8,7 @@
 | int32 | int32[] |  |
 | int64 | int64[] |  |
 | decimal | decimal[] |  |
+| datetime | datetime[] |  |
 | bytes | bytes[] |  |
 | object | object[] |  |
 | error | error[] |  |
diff --git a/conformance/no-http/ConformanceApi/AnyMap.md b/conformance/no-http/ConformanceApi/AnyMap.md
index 0069714..e04199b 100644
--- a/conformance/no-http/ConformanceApi/AnyMap.md
+++ b/conformance/no-http/ConformanceApi/AnyMap.md
@@ -8,6 +8,7 @@
 | int32 | map<int32> |  |
 | int64 | map<int64> |  |
 | decimal | map<decimal> |  |
+| datetime | map<datetime> |  |
 | bytes | map<bytes> |  |
 | object | map<object> |  |
 | error | map<error> |  |
diff --git a/conformance/no-http/ConformanceApi/AnyNullable.md b/conformance/no-http/ConformanceApi/AnyNullable.md
index 0aab4c1..e43ba31 100644
--- a/conformance/no-http/ConformanceApi/AnyNullable.md
+++ b/conformance/no-http/ConformanceApi/AnyNullable.md
@@ -8,6 +8,7 @@
 | int32 | nullable<int32> |  |
 | int64 | nullable<int64> |  |
 | decimal | nullable<decimal> |  |
+| datetime | nullable<datetime> |  |
 | bytes | nullable<bytes> |  |
 | object | nullable<object> |  |
 | error | nullable<error> |  |
diff --git a/conformance/no-http/ConformanceApi/AnyResult.md b/conformance/no-http/ConformanceApi/AnyResult.md
index d832800..1624d90 100644
--- a/conformance/no-http/ConformanceApi/AnyResult.md
+++ b/conformance/no-http/ConformanceApi/AnyResult.md
@@ -8,6 +8,7 @@
 | int32 | result<int32> |  |
 | int64 | result<int64> |  |
 | decimal | result<decimal> |  |
+| datetime | result<datetime> |  |
 | bytes | result<bytes> |  |
 | object | result<object> |  |
 | error | result<error> |  |
diff --git a/conformance/no-http/ConformanceApi/checkPath.md b/conformance/no-http/ConformanceApi/checkPath.md
index e35a851..c2cf8a0 100644
--- a/conformance/no-http/ConformanceApi/checkPath.md
+++ b/conformance/no-http/ConformanceApi/checkPath.md
@@ -9,5 +9,6 @@
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 <!-- DO NOT EDIT: generated by fsdgenmd -->
diff --git a/conformance/no-http/ConformanceApi/checkQuery.md b/conformance/no-http/ConformanceApi/checkQuery.md
index ef066a0..60236ae 100644
--- a/conformance/no-http/ConformanceApi/checkQuery.md
+++ b/conformance/no-http/ConformanceApi/checkQuery.md
@@ -9,5 +9,6 @@
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 <!-- DO NOT EDIT: generated by fsdgenmd -->
diff --git a/conformance/no-http/ConformanceApi/mirrorHeaders.md b/conformance/no-http/ConformanceApi/mirrorHeaders.md
index aab36e9..2438bac 100644
--- a/conformance/no-http/ConformanceApi/mirrorHeaders.md
+++ b/conformance/no-http/ConformanceApi/mirrorHeaders.md
@@ -9,6 +9,7 @@
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 | response | type | description |
 | --- | --- | --- |
@@ -19,5 +20,6 @@
 | int64 | int64 |  |
 | decimal | decimal |  |
 | enum | [Answer](Answer.md) |  |
+| datetime | datetime |  |
 
 <!-- DO NOT EDIT: generated by fsdgenmd -->
diff --git a/dotnet-tools.json b/dotnet-tools.json
index 8e16642..9562684 100644
--- a/dotnet-tools.json
+++ b/dotnet-tools.json
@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "facilityconformance": {
-      "version": "2.19.0",
+      "version": "2.21.0",
       "commands": [
         "FacilityConformance"
       ]
diff --git a/src/Facility.CodeGen.Markdown/MarkdownGeneratorGlobals.cs b/src/Facility.CodeGen.Markdown/MarkdownGeneratorGlobals.cs
index 345eb17..f9d4561 100644
--- a/src/Facility.CodeGen.Markdown/MarkdownGeneratorGlobals.cs
+++ b/src/Facility.CodeGen.Markdown/MarkdownGeneratorGlobals.cs
@@ -36,6 +36,7 @@ public static string RenderFieldType(ServiceTypeInfo typeInfo) =>
 			ServiceTypeKind.Int64 => "int64",
 			ServiceTypeKind.Decimal => "decimal",
 			ServiceTypeKind.Bytes => "bytes",
+			ServiceTypeKind.DateTime => "datetime",
 			ServiceTypeKind.Object => "object",
 			ServiceTypeKind.Error => "error",
 			ServiceTypeKind.Dto => $"[{typeInfo.Dto!.Name}]({typeInfo.Dto.Name}.md)",
@@ -59,6 +60,7 @@ public static string RenderFieldTypeAsJsonValue(ServiceTypeInfo typeInfo) =>
 			ServiceTypeKind.Int32 => "(integer)",
 			ServiceTypeKind.Int64 => "(integer)",
 			ServiceTypeKind.Bytes => "\"(base64)\"",
+			ServiceTypeKind.DateTime => "\"(date/time)\"",
 			ServiceTypeKind.Object => "{ ... }",
 			ServiceTypeKind.Error => "{ \"code\": ... }",
 			ServiceTypeKind.Dto => RenderDtoAsJsonValue(typeInfo.Dto!),