diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 2af7635..f667b8d 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -39,14 +39,14 @@ jobs:
       - name: Create merged firmware binary
         run: mkdir -p output && esptool.py --chip esp32s3 merge_bin -o output/full-firmware.bin --flash_mode dio 0x0000 .pio/build/esp32wemos-s3-mini_BW/bootloader.bin 0x8000 .pio/build/esp32wemos-s3-mini_BW/partitions.bin 0xe000 ~/.platformio/packages/framework-arduinoespressif32/tools/partitions/boot_app0.bin 0x10000 .pio/build/esp32wemos-s3-mini_BW/firmware.bin 0x330000 .pio/build/esp32wemos-s3-mini_BW/spiffs.bin
 
-      - name: Create checksums
-        run: shasum -a 256 output/full-firmware.bin > output/full-firmware.sha256
+      - name: Create checksum for merged binary
+        run: shasum -a 256 output/full-firmware.bin | awk '{print $1}' > output/full-firmware.sha256
 
       - name: Write commit hash to file
         run: echo $GITHUB_SHA > output/commit.txt
 
       - name: Write build date to file
-        run: echo "$(date +'%Y-%m-%dT%H:%M:%S')" > output/date.txt
+        run: echo "$(date -u +'%Y-%m-%dT%H:%M:%SZ')" > output/date.txt
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v3