diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4efa094..81e35e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
 
 # ---- Project ----
 
@@ -18,6 +18,12 @@ if(PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
   )
 endif()
 
+# ---- Project settings ----
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS NO)
+
 # ---- Add dependencies via CPM ----
 # see https://github.com/TheLartians/CPM.cmake for more info
 
@@ -27,30 +33,41 @@ include(cmake/CPM.cmake)
 CPMAddPackage(
   NAME PackageProject.cmake
   GITHUB_REPOSITORY TheLartians/PackageProject.cmake
-  VERSION 1.3
+  VERSION 1.4
 )
 
+find_package(fmt)
+if(NOT TARGET fmt::fmt)
+  # FIXME this add a target without namespace! CK
+  CPMAddPackage(
+    NAME fmt
+    GIT_TAG 7.1.3
+    GITHUB_REPOSITORY fmtlib/fmt
+  )
+endif()
+
 # ---- Add source files ----
 
 # Note: globbing sources is considered bad practice as CMake's generators may not detect new files
 # automatically. Keep that in mind when changing files, or explicitly mention them here.
-file(GLOB_RECURSE headers CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/include/*.h")
-file(GLOB_RECURSE sources CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/source/*.cpp")
+file(GLOB_RECURSE headers CONFIGURE_DEPENDS "include/*.h")
+file(GLOB_RECURSE sources CONFIGURE_DEPENDS "source/*.cpp")
 
 # ---- Create library ----
 
 # Note: for header-only libraries change all PUBLIC flags to INTERFACE and create an interface
-# target: add_library(Greeter INTERFACE) set_target_properties(Greeter PROPERTIES
-# INTERFACE_COMPILE_FEATURES cxx_std_17)
+# target:
+add_library(Greeter)
+add_library(${PROJECT_NAME}::Greeter ALIAS Greeter)
+target_compile_features(Greeter PUBLIC cxx_std_17)
 
-add_library(Greeter ${headers} ${sources})
-
-set_target_properties(Greeter PROPERTIES CXX_STANDARD 17)
+target_sources(Greeter PRIVATE ${headers} ${sources})
 
 # being a cross-platform target, we enforce standards conformance on MSVC
 target_compile_options(Greeter PUBLIC "$<$<BOOL:${MSVC}>:/permissive->")
 
-# Link dependencies (if required) target_link_libraries(Greeter PUBLIC cxxopts)
+# Link dependencies (if required)
+target_link_libraries(Greeter PRIVATE fmt::fmt)
 
 target_include_directories(
   Greeter PUBLIC $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
@@ -71,5 +88,8 @@ packageProject(
   INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
   INCLUDE_DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION}
   VERSION_HEADER "${VERSION_HEADER_LOCATION}"
-  DEPENDENCIES ""
+  # semicolon separated list of the project's dependencies
+  DEPENDENCIES fmt
+  # install your library with a namespace! (do NOT add extra '::')
+  NAMESPACE ${PROJECT_NAME}
 )
diff --git a/all/CMakeLists.txt b/all/CMakeLists.txt
index e131b89..bf9e3f7 100644
--- a/all/CMakeLists.txt
+++ b/all/CMakeLists.txt
@@ -1,12 +1,15 @@
 # this script adds all subprojects to a single build to allow IDEs understand the full project
 # structure.
 
-cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
 
 project(BuildAll LANGUAGES CXX)
 
 include(../cmake/tools.cmake)
 
-add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/../standalone ${CMAKE_BINARY_DIR}/standalone)
-add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/../test ${CMAKE_BINARY_DIR}/test)
-add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/../documentation ${CMAKE_BINARY_DIR}/documentation)
+# needed to generate test target
+enable_testing()
+
+add_subdirectory(../standalone standalone)
+add_subdirectory(../test test)
+add_subdirectory(../documentation documentation)
diff --git a/cmake/CPM.cmake b/cmake/CPM.cmake
index bffba54..35edbeb 100644
--- a/cmake/CPM.cmake
+++ b/cmake/CPM.cmake
@@ -1,4 +1,4 @@
-set(CPM_DOWNLOAD_VERSION 0.27.2)
+set(CPM_DOWNLOAD_VERSION 0.28.2)
 
 if(CPM_SOURCE_CACHE)
   set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
diff --git a/cmake/tools.cmake b/cmake/tools.cmake
index 4029e37..836ecd4 100644
--- a/cmake/tools.cmake
+++ b/cmake/tools.cmake
@@ -8,6 +8,8 @@ endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/CPM.cmake)
 
+set(USE_STATIC_ANALYZER "" CACHE STRING "clang-tidy;cppcheck;iwyu")
+
 # enables sanitizers support using the the `USE_SANITIZER` flag available values are: Address,
 # Memory, MemoryWithOrigins, Undefined, Thread, Leak, 'Address;Undefined'
 if(USE_SANITIZER OR USE_STATIC_ANALYZER)
@@ -65,10 +67,11 @@ if(USE_SANITIZER OR USE_STATIC_ANALYZER)
 endif()
 
 # enables CCACHE support through the USE_CCACHE flag possible values are: YES, NO or equivalent
+option(USE_CCACHE "enable ccache usages" ON)
 if(USE_CCACHE)
   CPMAddPackage(
     NAME Ccache.cmake
     GITHUB_REPOSITORY TheLartians/Ccache.cmake
-    VERSION 1.2.1
+    VERSION 1.2.2
   )
 endif()
diff --git a/documentation/CMakeLists.txt b/documentation/CMakeLists.txt
index e48fd95..8373176 100644
--- a/documentation/CMakeLists.txt
+++ b/documentation/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
 
 project(GreeterDocs)
 
@@ -11,7 +11,7 @@ CPMAddPackage(NAME Greeter SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/..)
 CPMAddPackage(
   NAME MCSS
   DOWNLOAD_ONLY YES
-  # patched version until https://github.com/mosra/m.css/pull/171 is resolved
+  # TODO: patched version until https://github.com/mosra/m.css/pull/171 is resolved
   GITHUB_REPOSITORY TheLartians/m.css
   GIT_TAG 1bf162b96d5bfefc9967a80cef138f1270ffa415
 )
@@ -22,16 +22,16 @@ CPMAddPackage(
 set(DOXYGEN_PROJECT_NAME Greeter)
 set(DOXYGEN_PROJECT_VERSION ${Greeter_VERSION})
 set(DOXYGEN_PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/..")
-set(DOXYGEN_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/doxygen")
+set(DOXYGEN_OUTPUT_DIRECTORY doxygen)
 
-configure_file(${CMAKE_CURRENT_LIST_DIR}/Doxyfile ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)
+configure_file(${CMAKE_CURRENT_LIST_DIR}/Doxyfile Doxyfile)
 
-configure_file(${CMAKE_CURRENT_LIST_DIR}/conf.py ${CMAKE_CURRENT_BINARY_DIR}/conf.py)
+configure_file(${CMAKE_CURRENT_LIST_DIR}/conf.py conf.py)
 
 add_custom_target(
   GenerateDocs
   ${CMAKE_COMMAND} -E make_directory "${DOXYGEN_OUTPUT_DIRECTORY}"
-  COMMAND "${MCSS_SOURCE_DIR}/documentation/doxygen.py" "${CMAKE_CURRENT_BINARY_DIR}/conf.py"
+  COMMAND "${MCSS_SOURCE_DIR}/documentation/doxygen.py" conf.py
   COMMAND echo "Docs written to: ${DOXYGEN_OUTPUT_DIRECTORY}"
   WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
 )
diff --git a/include/greeter/greeter.h b/include/greeter/greeter.h
index 77dfe3b..9d367d7 100644
--- a/include/greeter/greeter.h
+++ b/include/greeter/greeter.h
@@ -26,6 +26,9 @@ namespace greeter {
      * @return a string containing the greeting
      */
     std::string greet(LanguageCode lang = LanguageCode::EN) const;
+
+    /// @brief Return an iso date string
+    std::string getIsoDate() const;
   };
 
 }  // namespace greeter
diff --git a/source/greeter.cpp b/source/greeter.cpp
index b1c54a7..1a5bfb8 100644
--- a/source/greeter.cpp
+++ b/source/greeter.cpp
@@ -1,8 +1,9 @@
+#include <fmt/chrono.h>
 #include <greeter/greeter.h>
 
 using namespace greeter;
 
-Greeter::Greeter(std::string _name) : name(_name) {}
+Greeter::Greeter(std::string _name) : name(std::move(_name)) {}
 
 std::string Greeter::greet(LanguageCode lang) const {
   switch (lang) {
@@ -17,3 +18,8 @@ std::string Greeter::greet(LanguageCode lang) const {
       return "Bonjour " + name + "!";
   }
 }
+
+std::string Greeter::getIsoDate() const {
+  using namespace std::literals::chrono_literals;
+  return fmt::format("{:%H:%M:%S}", 3h + 15min + 30s);
+}
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index d62ce82..d269262 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
 
 project(GreeterTests LANGUAGES CXX)
 
@@ -15,11 +15,15 @@ include(../cmake/tools.cmake)
 
 include(../cmake/CPM.cmake)
 
-CPMAddPackage(
-  NAME doctest
-  GITHUB_REPOSITORY onqtam/doctest
-  GIT_TAG 2.3.7
-)
+find_package(doctest)
+if(NOT TARGET doctest::doctest)
+  # FIXME this add a target without namespace! CK
+  CPMAddPackage(
+    NAME doctest
+    GITHUB_REPOSITORY onqtam/doctest
+    GIT_TAG 2.3.7
+  )
+endif()
 
 if(TEST_INSTALLED_VERSION)
   find_package(Greeter REQUIRED)
@@ -37,9 +41,9 @@ CPMAddPackage(
 
 # ---- Create binary ----
 
-file(GLOB sources CONFIGURE_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/source/*.cpp)
+file(GLOB sources CONFIGURE_DEPENDS source/*.cpp)
 add_executable(GreeterTests ${sources})
-target_link_libraries(GreeterTests doctest Greeter)
+target_link_libraries(GreeterTests doctest::doctest Greeter::Greeter)
 
 set_target_properties(GreeterTests PROPERTIES CXX_STANDARD 17)
 
@@ -57,15 +61,16 @@ endif()
 
 enable_testing()
 
-# Note: doctest and similar testing frameworks can automatically configure CMake tests For other
-# testing frameworks add the tests target instead: ADD_TEST(GreeterTests GreeterTests)
+# Note: doctest and similar testing frameworks can automatically configure CMake tests.
+# include(${doctest_SOURCE_DIR}/scripts/cmake/doctest.cmake)
+# doctest_discover_tests(GreeterTests)
 
-include(${doctest_SOURCE_DIR}/scripts/cmake/doctest.cmake)
-doctest_discover_tests(GreeterTests)
+# For other testing frameworks add the tests target instead:
+ADD_TEST(GreeterTests GreeterTests)
 
 # ---- code coverage ----
 
-if(ENABLE_TEST_COVERAGE)
+if(ENABLE_TEST_COVERAGE AND NOT TEST_INSTALLED_VERSION)
   target_compile_options(Greeter PUBLIC -O0 -g -fprofile-arcs -ftest-coverage)
   target_link_options(Greeter PUBLIC -fprofile-arcs -ftest-coverage)
 endif()
diff --git a/test/source/greeter.cpp b/test/source/greeter.cpp
index 3d507e0..6dd4a90 100644
--- a/test/source/greeter.cpp
+++ b/test/source/greeter.cpp
@@ -18,4 +18,9 @@ TEST_CASE("Greeter") {
 TEST_CASE("Greeter version") {
   static_assert(std::string_view(GREETER_VERSION) == std::string_view("1.0"));
   CHECK(std::string(GREETER_VERSION) == std::string("1.0"));
-}
\ No newline at end of file
+}
+
+TEST_CASE("Greeter date") {
+  const greeter::Greeter greeter("Tests");
+  CHECK(greeter.getIsoDate() == std::string("03:15:30"));
+}