diff --git a/CMakeLists.txt b/CMakeLists.txt

index 19497879..2b229442 100644

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -25,7 +25,8 @@ project (Lagrange

set (COPYRIGHT_YEAR 2021)

if (IOS)

 set (PROJECT_VERSION 1.7)

- set (IOS_BUNDLE_VERSION 22)

+ set (IOS_BUNDLE_VERSION 23)

+ set (IOS_BUILD_DATE "2021-09-17")

endif ()



Default that depend on environment.

@@ -391,7 +392,10 @@ if (APPLE)

     XCODE_ATTRIBUTE_PRODUCT_BUNDLE_IDENTIFIER "fi.skyjake.lagrange"

 )

 if (IOS)

- target_compile_definitions (app PUBLIC LAGRANGE_IOS_VERSION="${IOS_BUNDLE_VERSION}")

+ target_compile_definitions (app PUBLIC 

+ LAGRANGE_IOS_VERSION="${IOS_BUNDLE_VERSION}"

+ LAGRANGE_IOS_BUILD_DATE="${IOS_BUILD_DATE}"

+ )

     set_target_properties (app PROPERTIES

         MACOSX_BUNDLE_INFO_PLIST "${CMAKE_CURRENT_LIST_DIR}/res/iOSBundleInfo.plist.in"

         MACOSX_BUNDLE_BUNDLE_VERSION "${IOS_BUNDLE_VERSION}"

diff --git a/src/ui/util.c b/src/ui/util.c

index b78cd6c6..5420e5d2 100644

--- a/src/ui/util.c

+++ b/src/ui/util.c

@@ -1948,7 +1948,7 @@ iWidget *makePreferences_Widget(void) {

     iString *aboutText = collectNew_String(); {

         setCStr_String(aboutText, "Lagrange " LAGRANGE_APP_VERSION);

         #if defined (iPlatformAppleMobile)

- appendCStr_String(aboutText, " (" LAGRANGE_IOS_VERSION ")");

+ appendCStr_String(aboutText, " (" LAGRANGE_IOS_VERSION ") \u2014 " LAGRANGE_IOS_BUILD_DATE);

         #endif

     }

     const iMenuItem aboutPanelItems[] = {