With clang 11, the build fails with:
```
azure-sdk-for-cpp/sdk/core/azure-core/inc/azure/core/datetime.hpp:285:14: error: no viable conversion from returned value of type 'time_point<Azure::_detail::Clock, typename common_type<duration<long, ratio<1, 10000000> >, duration<long long, ratio<1, 1> > >::type>' (aka 'time_point<Azure::_detail::Clock, duration<long long, ratio<__static_gcd<ratio<1, 10000000>::num, ratio<1, 1>::num>::value, __static_lcm<ratio<1, 10000000>::den, ratio<1, 1>::den>::value> > >') to function return type 'Azure::DateTime'
return DateTime(1970) + std::chrono::seconds(posixTime);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
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