Switch to official date lib repo for date.h

Builds/CMake/RippledCore.cmake

@@ -143,10 +143,11 @@ target_compile_options (xrpl_core
 target_link_libraries (xrpl_core
   PUBLIC
     OpenSSL::Crypto
+    Ripple::boost
+    Ripple::syslibs
     NIH::secp256k1
     NIH::ed25519-donna
-    Ripple::syslibs
-    Ripple::boost
+    date::date
     Ripple::opts)
 #[=================================[
    main/core headers installation
@@ -169,7 +170,6 @@ install (
     src/ripple/basics/base_uint.h
     src/ripple/basics/chrono.h
     src/ripple/basics/contract.h
-    src/ripple/basics/date.h
     src/ripple/basics/hardened_hash.h
     src/ripple/basics/strHex.h
   DESTINATION include/ripple/basics)

Builds/CMake/deps/date.cmake

@@ -0,0 +1,49 @@
+#[===================================================================[
+   NIH dep: date
+
+   the main library is header-only, thus is an INTERFACE lib in CMake.
+
+   NOTE: this has been accepted into c++20 so can likely be replaced
+   when we update to that standard
+#]===================================================================]
+
+find_package (date QUIET)
+if (NOT TARGET date::date)
+  if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.14)
+    FetchContent_Declare(
+      hh_date_src
+      GIT_REPOSITORY https://github.com/HowardHinnant/date.git
+      GIT_TAG        48f1455cd255df2fe73b5f293b47203ad0988199
+    )
+    FetchContent_MakeAvailable(hh_date_src)
+  else ()
+    ExternalProject_Add (hh_date_src
+      PREFIX ${nih_cache_path}
+      GIT_REPOSITORY https://github.com/HowardHinnant/date.git
+      GIT_TAG        48f1455cd255df2fe73b5f293b47203ad0988199
+      CONFIGURE_COMMAND ""
+      BUILD_COMMAND ""
+      TEST_COMMAND ""
+      INSTALL_COMMAND ""
+    )
+    ExternalProject_Get_Property (hh_date_src SOURCE_DIR)
+    set (hh_date_src_SOURCE_DIR "${SOURCE_DIR}")
+    file (MAKE_DIRECTORY ${hh_date_src_SOURCE_DIR}/include)
+    add_library (date_interface INTERFACE)
+    add_library (date::date ALIAS date_interface)
+    add_dependencies (date_interface hh_date_src)
+    file (TO_CMAKE_PATH "${hh_date_src_SOURCE_DIR}" hh_date_src_SOURCE_DIR)
+    target_include_directories (date_interface
+      SYSTEM INTERFACE
+          $<BUILD_INTERFACE:${hh_date_src_SOURCE_DIR}/include>
+          $<INSTALL_INTERFACE:include>)
+    install (
+      FILES
+        ${hh_date_src_SOURCE_DIR}/include/date/date.h
+      DESTINATION include/date)
+    install (TARGETS date_interface
+      EXPORT RippleExports
+      INCLUDES DESTINATION include)
+  endif ()
+endif ()
+

CMakeLists.txt

@@ -52,6 +52,7 @@ include(deps/Soci)
 include(deps/Snappy)
 include(deps/Rocksdb)
 include(deps/Nudb)
+include(deps/date)
 include(deps/Protobuf)
 
 ###

src/ripple/app/ledger/impl/LedgerToJson.cpp

@@ -20,10 +20,11 @@
 #include <ripple/app/ledger/LedgerToJson.h>
 #include <ripple/app/misc/TxQ.h>
 #include <ripple/basics/base_uint.h>
-#include <ripple/basics/date.h>
 #include <ripple/rpc/Context.h>
 #include <ripple/rpc/DeliveredAmount.h>
 
+#include <date/date.h>
+
 namespace ripple {
 
 namespace {

src/ripple/app/misc/impl/ValidatorList.cpp

@@ -19,13 +19,14 @@
 
 #include <ripple/app/misc/ValidatorList.h>
 #include <ripple/basics/base64.h>
-#include <ripple/basics/date.h>
 #include <ripple/basics/Slice.h>
 #include <ripple/basics/StringUtilities.h>
 #include <ripple/json/json_reader.h>
 #include <ripple/protocol/jss.h>
 #include <boost/regex.hpp>
 
+#include <date/date.h>
+
 #include <mutex>
 #include <shared_mutex>
 

src/ripple/beast/clock/basic_seconds_clock.h

@@ -20,7 +20,7 @@
 #ifndef BEAST_CHRONO_BASIC_SECONDS_CLOCK_H_INCLUDED
 #define BEAST_CHRONO_BASIC_SECONDS_CLOCK_H_INCLUDED
 
-#include <ripple/basics/date.h>
+#include <date/date.h>
 
 #include <algorithm>
 #include <chrono>

src/ripple/beast/insight/Event.h

@@ -22,7 +22,7 @@
 
 #include <ripple/beast/insight/EventImpl.h>
 
-#include <ripple/basics/date.h>
+#include <date/date.h>
 
 #include <chrono>
 #include <memory>

src/ripple/core/impl/LoadMonitor.cpp

@@ -19,9 +19,10 @@
 
 #include <ripple/basics/Log.h>
 #include <ripple/basics/UptimeClock.h>
-#include <ripple/basics/date.h>
 #include <ripple/core/LoadMonitor.h>
 
+#include <date/date.h>
+
 namespace ripple {
 
 /*