diff --git a/cmake/today.cmake b/cmake/today.cmake
index 51d0031a8..d2f5eaa87 100644
--- a/cmake/today.cmake
+++ b/cmake/today.cmake
@@ -3,14 +3,10 @@
 # YYYY-MM-DD
 #
 MACRO (TODAY RESULT)
-    IF (WIN32)
-        EXECUTE_PROCESS(COMMAND "cmd" " /C date +%Y-%m-%d" OUTPUT_VARIABLE ${RESULT})
-        string(REGEX REPLACE "(..)/(..)/..(..).*" "\\1/\\2/\\3" ${RESULT} ${${RESULT}})
-    ELSEIF(UNIX)
-        EXECUTE_PROCESS(COMMAND "date" "+%Y-%m-%d" OUTPUT_VARIABLE ${RESULT})
-        string(REGEX REPLACE "(..)/(..)/..(..).*" "\\1/\\2/\\3" ${RESULT} ${${RESULT}})
-    ELSE (WIN32)
-        MESSAGE(SEND_ERROR "date not implemented")
-        SET(${RESULT} 000000)
-    ENDIF (WIN32)
+    if (DEFINED ENV{SOURCE_DATE_EPOCH} AND NOT WIN32)
+        EXECUTE_PROCESS(COMMAND "date" "-u" "-d" "@$ENV{SOURCE_DATE_EPOCH}" "+%Y-%m-%d"
+                        OUTPUT_VARIABLE ${RESULT} OUTPUT_STRIP_TRAILING_WHITESPACE)
+    else()
+        STRING(TIMESTAMP ${RESULT} "%Y-%m-%d" UTC)
+    endif()
 ENDMACRO (TODAY)