diff --git a/src/gps/RTC.cpp b/src/gps/RTC.cpp
index e208e2df9..5528249c4 100644
--- a/src/gps/RTC.cpp
+++ b/src/gps/RTC.cpp
@@ -9,6 +9,10 @@
 static RTCQuality currentQuality = RTCQualityNone;
 uint32_t lastSetFromPhoneNtpOrGps = 0;
 
+// Rate limiting for GPS time validation warnings
+static uint32_t lastTimeValidationWarning = 0;
+static const uint32_t TIME_VALIDATION_WARNING_INTERVAL_MS = 15000; // 15 seconds
+
 RTCQuality getRTCQuality()
 {
     return currentQuality;
@@ -130,11 +134,20 @@ RTCSetResult perhapsSetRTC(RTCQuality q, const struct timeval *tv, bool forceUpd
     uint32_t printableEpoch = tv->tv_sec; // Print lib only supports 32 bit but time_t can be 64 bit on some platforms
 #ifdef BUILD_EPOCH
     if (tv->tv_sec < BUILD_EPOCH) {
-        LOG_WARN("Ignore time (%ld) before build epoch (%ld)!", printableEpoch, BUILD_EPOCH);
+        if (Throttle::isWithinTimespanMs(lastTimeValidationWarning, TIME_VALIDATION_WARNING_INTERVAL_MS) == false) {
+            LOG_WARN("Ignore time (%ld) before build epoch (%ld)!", printableEpoch, BUILD_EPOCH);
+            lastTimeValidationWarning = millis();
+        }
         return RTCSetResultInvalidTime;
-    } else if (tv->tv_sec > (BUILD_EPOCH + FORTY_YEARS)) {
-        LOG_WARN("Ignore time (%ld) too far in the future (build epoch: %ld, max allowed: %ld)!", printableEpoch, BUILD_EPOCH,
-                 BUILD_EPOCH + FORTY_YEARS);
+    } else if (tv->tv_sec > (time_t)(BUILD_EPOCH + FORTY_YEARS)) {
+        if (Throttle::isWithinTimespanMs(lastTimeValidationWarning, TIME_VALIDATION_WARNING_INTERVAL_MS) == false) {
+            // Calculate max allowed time safely to avoid overflow in logging
+            uint64_t maxAllowedTime = (uint64_t)BUILD_EPOCH + FORTY_YEARS;
+            uint32_t maxAllowedPrintable = (maxAllowedTime > UINT32_MAX) ? UINT32_MAX : (uint32_t)maxAllowedTime;
+            LOG_WARN("Ignore time (%ld) too far in the future (build epoch: %ld, max allowed: %ld)!", printableEpoch,
+                     (uint32_t)BUILD_EPOCH, maxAllowedPrintable);
+            lastTimeValidationWarning = millis();
+        }
         return RTCSetResultInvalidTime;
     }
 #endif
@@ -252,11 +265,20 @@ RTCSetResult perhapsSetRTC(RTCQuality q, struct tm &t)
     uint32_t printableEpoch = tv.tv_sec; // Print lib only supports 32 bit but time_t can be 64 bit on some platforms
 #ifdef BUILD_EPOCH
     if (tv.tv_sec < BUILD_EPOCH) {
-        LOG_WARN("Ignore time (%ld) before build epoch (%ld)!", printableEpoch, BUILD_EPOCH);
+        if (Throttle::isWithinTimespanMs(lastTimeValidationWarning, TIME_VALIDATION_WARNING_INTERVAL_MS) == false) {
+            LOG_WARN("Ignore time (%ld) before build epoch (%ld)!", printableEpoch, BUILD_EPOCH);
+            lastTimeValidationWarning = millis();
+        }
         return RTCSetResultInvalidTime;
-    } else if (tv.tv_sec > (BUILD_EPOCH + FORTY_YEARS)) {
-        LOG_WARN("Ignore time (%ld) too far in the future (build epoch: %ld, max allowed: %ld)!", printableEpoch, BUILD_EPOCH,
-                 BUILD_EPOCH + FORTY_YEARS);
+    } else if (tv.tv_sec > (time_t)(BUILD_EPOCH + FORTY_YEARS)) {
+        if (Throttle::isWithinTimespanMs(lastTimeValidationWarning, TIME_VALIDATION_WARNING_INTERVAL_MS) == false) {
+            // Calculate max allowed time safely to avoid overflow in logging
+            uint64_t maxAllowedTime = (uint64_t)BUILD_EPOCH + FORTY_YEARS;
+            uint32_t maxAllowedPrintable = (maxAllowedTime > UINT32_MAX) ? UINT32_MAX : (uint32_t)maxAllowedTime;
+            LOG_WARN("Ignore time (%ld) too far in the future (build epoch: %ld, max allowed: %ld)!", printableEpoch,
+                     (uint32_t)BUILD_EPOCH, maxAllowedPrintable);
+            lastTimeValidationWarning = millis();
+        }
         return RTCSetResultInvalidTime;
     }
 #endif
diff --git a/src/gps/RTC.h b/src/gps/RTC.h
index 03350823c..1ecde79ae 100644
--- a/src/gps/RTC.h
+++ b/src/gps/RTC.h
@@ -56,5 +56,5 @@ time_t gm_mktime(struct tm *tm);
 #define SEC_PER_HOUR 3600
 #define SEC_PER_MIN 60
 #ifdef BUILD_EPOCH
-#define FORTY_YEARS (40UL * 365 * SEC_PER_DAY) // probably time to update your firmware
+#define FORTY_YEARS (40ULL * 365 * SEC_PER_DAY) // Use 64-bit arithmetic to prevent overflow
 #endif