if(NOT TODAY)
  if(WIN32)
    execute_process(COMMAND "cmd" " /C date /T" OUTPUT_VARIABLE TODAY)
  else()
    execute_process(COMMAND "date" "+%d/%m/%Y" OUTPUT_VARIABLE TODAY)
  endif()
  string(REGEX REPLACE "(..)/(..)/(....).*" "\\3-\\2-\\1" TODAY ${TODAY})
endif()