diff --git a/CMakeLists.txt b/CMakeLists.txt
index 431eda87..071f50b2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,14 +69,14 @@ if(Git_FOUND)
         )
 
     execute_process(
-        COMMAND "${GIT_EXECUTABLE}" log -1 --format=%ad --date=format:%Y%m%d
+        COMMAND "${GIT_EXECUTABLE}" log -1 --format=%cd --date=format:%Y%m%d
         WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
         OUTPUT_VARIABLE GIT_COMMIT_DATE
         ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
         )
 
     execute_process(
-        COMMAND "${GIT_EXECUTABLE}" log -1 --format=%ad --date=format:%Y
+        COMMAND "${GIT_EXECUTABLE}" log -1 --format=%cd --date=format:%Y
         WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
         OUTPUT_VARIABLE GIT_COMMIT_YEAR
         ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
diff --git a/src/build-helpers/package-version b/src/build-helpers/package-version
index cc87d13e..beb5b36c 100755
--- a/src/build-helpers/package-version
+++ b/src/build-helpers/package-version
@@ -71,7 +71,7 @@ if test -d "$GIT_DIR"; then
         echo "version_error_71" | ${TR-tr} -d '\012'; \
         exit 2; \
     }
-    GIT_COMMIT_DATE="$(${GIT-git} log -1 --format=%ad --date=format:%Y%m%d)" || { \
+    GIT_COMMIT_DATE="$(${GIT-git} log -1 --format=%cd --date=format:%Y%m%d)" || { \
         echo "$prog: Error: Cannot run 'git log' for commit date" >&2; \
         echo "version_error_72" | ${TR-tr} -d '\012'; \
         exit 2; \