From a3c6e859322ae0b762a922f93b5d2ab4c35950f8 Mon Sep 17 00:00:00 2001
From: Ben Meadors <benmmeadors@gmail.com>
Date: Fri, 13 Sep 2024 18:12:58 -0500
Subject: [PATCH 1/2] Ignore attempts to set times in the past (before our
 build epoch)

---
 platformio.ini  | 1 +
 src/gps/RTC.cpp | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/platformio.ini b/platformio.ini
index 7613a2f43b..d561aaf744 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -81,6 +81,7 @@ build_flags = -Wno-missing-field-initializers
   -DRADIOLIB_EXCLUDE_APRS
   -DRADIOLIB_EXCLUDE_LORAWAN
   -DMESHTASTIC_EXCLUDE_DROPZONE=1
+  -DBUILD_EPOCH=$UNIX_TIME
   ;-D OLED_PL
 
 monitor_speed = 115200
diff --git a/src/gps/RTC.cpp b/src/gps/RTC.cpp
index c056bb9e48..59a33890fe 100644
--- a/src/gps/RTC.cpp
+++ b/src/gps/RTC.cpp
@@ -109,7 +109,13 @@ bool perhapsSetRTC(RTCQuality q, const struct timeval *tv, bool forceUpdate)
     static uint32_t lastSetMsec = 0;
     uint32_t now = millis();
     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("Ignoring time (%ld) before build epoch (%ld)!\n", printableEpoch, BUILD_EPOCH);
+        return false;
+    }
+#endif
+    
     bool shouldSet;
     if (forceUpdate) {
         shouldSet = true;

From 347163b8405cd4529f935ace29999fb37dccf511 Mon Sep 17 00:00:00 2001
From: Ben Meadors <benmmeadors@gmail.com>
Date: Fri, 13 Sep 2024 18:21:12 -0500
Subject: [PATCH 2/2] TRONK

---
 src/gps/RTC.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gps/RTC.cpp b/src/gps/RTC.cpp
index 59a33890fe..42a98f5685 100644
--- a/src/gps/RTC.cpp
+++ b/src/gps/RTC.cpp
@@ -115,7 +115,7 @@ bool perhapsSetRTC(RTCQuality q, const struct timeval *tv, bool forceUpdate)
         return false;
     }
 #endif
-    
+
     bool shouldSet;
     if (forceUpdate) {
         shouldSet = true;