diff --git a/Sources/Confidence/ConfidenceValue.swift b/Sources/Confidence/ConfidenceValue.swift
index 08d2e563..afbe00c0 100644
--- a/Sources/Confidence/ConfidenceValue.swift
+++ b/Sources/Confidence/ConfidenceValue.swift
@@ -212,7 +212,7 @@ extension ConfidenceValueInternal {
             try container.encode(boolean)
         case .date(let dateComponents):
             let dateFormatter = DateFormatter()
-            dateFormatter.dateFormat = "dd-MM-yyyy"
+            dateFormatter.dateFormat = "yyyy-MM-dd"
             if let date = Calendar.current.date(from: dateComponents) {
                 try container.encode(dateFormatter.string(from: date))
             } else {
diff --git a/Tests/ConfidenceTests/ConfidenceValueTests.swift b/Tests/ConfidenceTests/ConfidenceValueTests.swift
index e6cd2c9c..f315b577 100644
--- a/Tests/ConfidenceTests/ConfidenceValueTests.swift
+++ b/Tests/ConfidenceTests/ConfidenceValueTests.swift
@@ -121,7 +121,7 @@ final class ConfidenceConfidenceValueTests: XCTestCase {
         let resultString = String(data: try encoder.encode(value), encoding: .utf8)
         let expectedString = """
         {\"bool\":true,
-        \"date\":\"03-04-2024\",
+        \"date\":\"2024-04-03\",
         \"double\":4.5,
         \"int\":3,
         \"list\":[3,5],