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This is an older version of Boost and was released in 2024. The current version is 1.89.0.
boost::log::expressions::format_date_time
// In header: <boost/log/expressions/formatters/date_time.hpp> template<typename AttributeValueT, typename CharT> format_date_time_actor< AttributeValueT, fallback_to_none, CharT > format_date_time(attribute_name const & name, const CharT * format);