diff --git a/Sources/BluetoothGATT/GATTDateTime.swift b/Sources/BluetoothGATT/GATTDateTime.swift
index 2d8e2693b..c18fa87b8 100644
--- a/Sources/BluetoothGATT/GATTDateTime.swift
+++ b/Sources/BluetoothGATT/GATTDateTime.swift
@@ -51,8 +51,13 @@ public struct GATTDateTime: GATTCharacteristic, Equatable, Hashable, Sendable {
         self.minute = minute
         self.second = second
     }
+}
+
+// MARK: - DataConvertible
+
+extension GATTDateTime: DataConvertible {
     
-    internal static var length: Int { 7 }
+    public static var length: Int { 7 }
 
     public init?<Data: DataContainer>(data: Data) {
         
@@ -78,6 +83,10 @@ public struct GATTDateTime: GATTCharacteristic, Equatable, Hashable, Sendable {
         data += minute.rawValue
         data += second.rawValue
     }
+    
+    public var dataLength: Int {
+        Self.length
+    }
 }
 
 #if canImport(Foundation)