diff --git a/.github/workflows/third_party.yml b/.github/workflows/third_party.yml
index ccd08101..0f88e3e4 100644
--- a/.github/workflows/third_party.yml
+++ b/.github/workflows/third_party.yml
@@ -112,7 +112,7 @@ jobs:
           set -x
           uv venv .venv
 
-          uv pip install -r test-requirements.txt --exclude-newer "$(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)"
+          uv pip install -r test-requirements.txt --exclude-newer "$(git show -s --format=%cI HEAD)"
           uv pip install -e "typing-extensions @ ../typing-extensions-latest"
 
           printf "\n\nINSTALLED DEPENDENCIES ARE:\n\n"
@@ -152,7 +152,7 @@ jobs:
           set -x
           uv venv .venv
 
-          uv pip install -e 'pycroscope[tests] @ .' --exclude-newer "$(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)"
+          uv pip install -e 'pycroscope[tests] @ .' --exclude-newer "$(git show -s --format=%cI HEAD)"
           uv pip install -e "typing-extensions @ ../typing-extensions-latest"
 
           printf "\n\nINSTALLED DEPENDENCIES ARE:\n\n"
@@ -194,7 +194,7 @@ jobs:
           set -x
           uv venv .venv
 
-          uv pip install -e "typeguard @ ." --group test  --exclude-newer "$(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)"
+          uv pip install -e "typeguard @ ." --group test  --exclude-newer "$(git show -s --format=%cI HEAD)"
           uv pip install -e "typing-extensions @ ../typing-extensions-latest"
 
           printf "\n\nINSTALLED DEPENDENCIES ARE:\n\n"
@@ -241,8 +241,8 @@ jobs:
           set -x
           uv venv .venv
 
-          uv pip install -e "typed-argument-parser @ ."  --exclude-newer "$(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)"
-          uv pip install pytest  --exclude-newer "$(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)"
+          uv pip install -e "typed-argument-parser @ ."  --exclude-newer "$(git show -s --format=%cI HEAD)"
+          uv pip install pytest  --exclude-newer "$(git show -s --format=%cI HEAD)"
           uv pip install -e "typing-extensions @ ../typing-extensions-latest"
 
           printf "\n\nINSTALLED DEPENDENCIES ARE:\n\n"
@@ -283,7 +283,7 @@ jobs:
           set -x
           uv venv .venv
 
-          uv pip install -r test-requirements.txt  --exclude-newer "$(git show -s --date=format:'%Y-%m-%dT%H:%M:%SZ' --format=%cd HEAD)"
+          uv pip install -r test-requirements.txt  --exclude-newer "$(git show -s --format=%cI HEAD)"
           uv pip install -e .
           uv pip install -e "typing_extensions @ ../typing-extensions-latest"