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diff --git a/source/storage/TimeSource.mc b/source/storage/TimeSource.mc
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+// Author:  cirakg & claude ai
+// Summary: The clocks the PIN lockout uses, behind a class so tests can inject a fake clock.
+//
+// Lockout delays use the trusted clock (GPS-synced, not user-adjustable) when
+// it is synced, and the system uptime timer otherwise (README 7.6). Tests
+// replace this class with one whose clocks they set by hand, which makes the
+// lockout schedule, restarts and clock loss testable.
+
+import Toybox.Lang;
+import Toybox.System;
+
+class TimeSource {
+
+    function initialize() {
+    }
+
+    // Trusted unix time in seconds, or null when the trusted clock isn't synced.
+    function trustedUnix() as Long? {
+        return Clock.trustedUnix();
+    }
+
+    // Milliseconds from the system timer. It restarts at zero when the watch
+    // restarts and wraps after about 24.8 days.
+    function uptimeMs() as Number {
+        return System.getTimer();
+    }
+}