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This is an older version of Boost and was released in 2024. The current version is 1.90.0.
boost::log::expressions::format_date_time
// In header: <boost/log/expressions/formatters/date_time.hpp> template<typename DescriptorT, template< typename > class ActorT, typename CharT> format_date_time_actor< typename DescriptorT::value_type, fallback_to_none, CharT, ActorT > format_date_time(attribute_keyword< DescriptorT, ActorT > const & keyword, const CharT * format);