diff --git a/.github/actions/setup-base/action.yml b/.github/actions/setup-base/action.yml
index 350ca290c..f6c1fd80c 100644
--- a/.github/actions/setup-base/action.yml
+++ b/.github/actions/setup-base/action.yml
@@ -11,11 +11,6 @@ runs:
         ref: ${{github.event.pull_request.head.ref}}
         repository: ${{github.event.pull_request.head.repo.full_name}}
 
-    - name: Uncomment build epoch
-      shell: bash
-      run: |
-        sed -i 's/#-DBUILD_EPOCH=$UNIX_TIME/-DBUILD_EPOCH=$UNIX_TIME/' platformio.ini
-
     - name: Install dependencies
       shell: bash
       run: |
diff --git a/bin/build-firmware.sh b/bin/build-firmware.sh
index fdd7caa11..7bd19aaa9 100644
--- a/bin/build-firmware.sh
+++ b/bin/build-firmware.sh
@@ -1,7 +1,5 @@
 #!/usr/bin/env bash
 
-sed -i 's/#-DBUILD_EPOCH=$UNIX_TIME/-DBUILD_EPOCH=$UNIX_TIME/' platformio.ini
-
 export PIP_BREAK_SYSTEM_PACKAGES=1
 
 if (echo $2 | grep -q "esp32"); then
diff --git a/bin/platformio-custom.py b/bin/platformio-custom.py
index fc1b4bc2e..e54d1586f 100644
--- a/bin/platformio-custom.py
+++ b/bin/platformio-custom.py
@@ -6,6 +6,8 @@ from os.path import join
 import subprocess
 import json
 import re
+import time
+from datetime import datetime
 
 from readprops import readProps
 
@@ -125,11 +127,16 @@ for pref in userPrefs:
         pref_flags.append("-D" + pref + "=" + env.StringifyMacro(userPrefs[pref]) + "")
 
 # General options that are passed to the C and C++ compilers
+# Calculate unix epoch for current day (midnight)
+current_date = datetime.now().replace(hour=0, minute=0, second=0, microsecond=0)
+build_epoch = int(current_date.timestamp())
+
 flags = [
         "-DAPP_VERSION=" + verObj["long"],
         "-DAPP_VERSION_SHORT=" + verObj["short"],
         "-DAPP_ENV=" + env.get("PIOENV"),
         "-DAPP_REPO=" + repo_owner,
+        "-DBUILD_EPOCH=" + str(build_epoch),
     ] + pref_flags
 
 print ("Using flags:")
diff --git a/platformio.ini b/platformio.ini
index 81f95a7e3..e2e5e1a18 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -53,7 +53,7 @@ build_flags = -Wno-missing-field-initializers
 	-DMESHTASTIC_EXCLUDE_POWERSTRESS=1 ; exclude power stress test module from main firmware
 	-DMESHTASTIC_EXCLUDE_GENERIC_THREAD_MODULE=1
 	-D MAX_THREADS=40 ; As we've split modules, we have more threads to manage
-	#-DBUILD_EPOCH=$UNIX_TIME
+	#-DBUILD_EPOCH=$UNIX_TIME ; set in platformio-custom.py now
 	#-D OLED_PL=1
 
 monitor_speed = 115200