diff --git a/Sources/AmiiboService/Internal/Extensions/DateFormatter+Properties.swift b/Sources/AmiiboService/Internal/Extensions/DateFormatter+Properties.swift
index 8fabadf..26fcafc 100644
--- a/Sources/AmiiboService/Internal/Extensions/DateFormatter+Properties.swift
+++ b/Sources/AmiiboService/Internal/Extensions/DateFormatter+Properties.swift
@@ -18,17 +18,29 @@ extension DateFormatter {
     
     // MARK: Properties
     
+    /// An ISO date formatter.
+    ///
+    /// This formatter implements the `yyyy-MM-dd` date format.
+    static let isoDate: DateFormatter = {
+        let formatter = DateFormatter()
+        
+        formatter.dateFormat = "yyyy-MM-dd"
+        formatter.timeZone = .init(secondsFromGMT: 0)
+        
+        return formatter
+    }()
+    
     /// An ISO timestamp formatter.
     ///
     /// This formatter implements the `yyyy-MM-dd'T'HH:mm:ss.SSSSSS` custom date format.
     /// Within the context of this library, this formatter is solely used to decode a date formatted as a timestamp that is returned by the ``AmiiboService/getLastUpdated()`` function.
-    static var isoTimestamp: DateFormatter {
+    static let isoTimestamp: DateFormatter = {
         let formatter = DateFormatter()
         
         formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSS"
         formatter.timeZone = .init(secondsFromGMT: 0)
         
         return formatter
-    }
+    }()
     
 }