Cant build project using Boost CMake vcpkg date_time linking error - c++

Question

I'm trying to use boost::asio through cmake and vcpkg in my project and
everytime I touch something releated to date_time (even implicitly) I get some linking errors releated to gregorian calendar.
Someone knows why this isn't linking?
I'm new to CMake & vcpkg.
Host Environment
OS: Windows 10
Compiler: MSVC++ 14.23
To Reproduce
./vcpkg install Boost
cd $MyProjectDir
mkdir build
cd build
cmake -G "Visual Studio 16 2019" -A x64 ..
cmake --build .
problematic C++ code
#include <boost/asio.hpp>
int main() {
boost::asio::io_service service;
//boost::asio::deadline_timer timer(service); // this one causes error
}
My CMakeLists.txt
cmake_minimum_required(VERSION 3.14)
set(CMAKE_TOOLCHAIN_FILE "C:/Repos/vcpkg/scripts/buildsystems/vcpkg.cmake")
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)
project(Backend)
find_package(Boost REQUIRED)
add_executable(Backend
"source/main.cpp"
)
target_link_libraries(Backend PRIVATE ${Boost_LIBRARIES})
target_include_directories(Backend PRIVATE ${Boost_INCLUDE_DIRS})
Failure logs
2>------ Build started: Project: Backend, Configuration: Debug x64 ------
2>Building Custom Rule C:/Repos/fridge/backend/CMakeLists.txt
2>main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __cdecl boost::gregorian::greg_month::greg_month(unsigned short)" (__imp_??0greg_month#gregorian#boost##QEAA#G#Z) referenced in function "public: __cdecl boost::gregorian::date::date(enum boost::date_time::special_values)" (??0date#gregorian#boost##QEAA#W4special_values#date_time#2##Z)
2>main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __cdecl boost::gregorian::greg_month::operator unsigned short(void)const " (__imp_??Bgreg_month#gregorian#boost##QEBAGXZ) referenced in function "public: static unsigned int __cdecl boost::date_time::gregorian_calendar_base<struct boost::date_time::year_month_day_base<class boost::gregorian::greg_year,class boost::gregorian::greg_month,class boost::gregorian::greg_day>,unsigned int>::day_number(struct boost::date_time::year_month_day_base<class boost::gregorian::greg_year,class boost::gregorian::greg_month,class boost::gregorian::greg_day> const &)" (?day_number#?$gregorian_calendar_base#U?$year_month_day_base#Vgreg_year#gregorian#boost##Vgreg_month#23#Vgreg_day#23##date_time#boost##I#date_time#boost##SAIAEBU?$year_month_day_base#Vgreg_year#gregorian#boost##Vgreg_month#23#Vgreg_day#23##23##Z)
2>C:\Repos\fridge\backend\build\Debug\Backend.exe : fatal error LNK1120: 2 unresolved externals
2>Done building project "Backend.vcxproj" -- FAILED.

Answer 1

fix was:
find_package(Boost REQUIRED COMPONENTS date_time)
Without asio because as Alan Birtles pointed out, asio is header only.