diff --git a/CMakeLists.txt b/CMakeLists.txt
index 79f03392..bef4544e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -76,7 +76,6 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
 endif()
 
 option(SPDLOG_PREVENT_CHILD_FD "Prevent from child processes to inherit log file descriptors" OFF)
-option(SPDLOG_NO_DATETIME, "Prevent spdlog from querying the clock on each log call if no datetime is needed" OFF)
 option(SPDLOG_NO_THREAD_ID "prevent spdlog from querying the thread id on each log call if thread id is not needed" OFF)
 option(SPDLOG_NO_TLS "prevent spdlog from using thread local storage" OFF)
 option(SPDLOG_NO_ATOMIC_LEVELS "prevent spdlog from using of std::atomic log levels (use only if your code never modifies log levels concurrently" OFF)
@@ -180,12 +179,6 @@ if(SPDLOG_PREVENT_CHILD_FD)
     target_compile_definitions(spdlog_header_only INTERFACE SPDLOG_PREVENT_CHILD_FD)
 endif()
 
-
-if(SPDLOG_NO_DATETIME)
-    target_compile_definitions(spdlog PUBLIC SPDLOG_NO_DATETIME)
-    target_compile_definitions(spdlog_header_only INTERFACE SPDLOG_NO_DATETIME)
-endif()
-
 if(SPDLOG_NO_THREAD_ID)
     target_compile_definitions(spdlog PRIVATE SPDLOG_NO_THREAD_ID)
     target_compile_definitions(spdlog_header_only INTERFACE SPDLOG_NO_THREAD_ID)
diff --git a/include/spdlog/details/log_msg-inl.h b/include/spdlog/details/log_msg-inl.h
index cb130532..a47fe660 100644
--- a/include/spdlog/details/log_msg-inl.h
+++ b/include/spdlog/details/log_msg-inl.h
@@ -15,10 +15,7 @@ namespace details {
 SPDLOG_INLINE log_msg::log_msg(spdlog::source_loc loc, string_view_t logger_name, spdlog::level::level_enum lvl, spdlog::string_view_t msg)
     : logger_name(logger_name)
     , level(lvl)
-#ifndef SPDLOG_NO_DATETIME
     , time(os::now())
-#endif
-
 #ifndef SPDLOG_NO_THREAD_ID
     , thread_id(os::thread_id())
 #endif
diff --git a/include/spdlog/details/pattern_formatter-inl.h b/include/spdlog/details/pattern_formatter-inl.h
index 33a57a13..f97e2c2f 100644
--- a/include/spdlog/details/pattern_formatter-inl.h
+++ b/include/spdlog/details/pattern_formatter-inl.h
@@ -904,8 +904,6 @@ public:
         using std::chrono::milliseconds;
         using std::chrono::seconds;
 
-#ifndef SPDLOG_NO_DATETIME
-
         // cache the date/time part for the next second.
         auto duration = msg.time.time_since_epoch();
         auto secs = duration_cast<seconds>(duration);
@@ -941,10 +939,6 @@ public:
         dest.push_back(']');
         dest.push_back(' ');
 
-#else // no datetime needed
-        (void)tm_time;
-#endif
-
 #ifndef SPDLOG_NO_NAME
         if (msg.logger_name.size() > 0)
         {
@@ -1014,14 +1008,13 @@ SPDLOG_INLINE std::unique_ptr<formatter> pattern_formatter::clone() const
 
 SPDLOG_INLINE void pattern_formatter::format(const details::log_msg &msg, memory_buf_t &dest)
 {
-#ifndef SPDLOG_NO_DATETIME
     auto secs = std::chrono::duration_cast<std::chrono::seconds>(msg.time.time_since_epoch());
     if (secs != last_log_secs_)
     {
         cached_tm_ = get_time_(msg);
         last_log_secs_ = secs;
     }
-#endif
+
     for (auto &f : formatters_)
     {
         f->format(msg, cached_tm_, dest);
diff --git a/include/spdlog/sinks/daily_file_sink.h b/include/spdlog/sinks/daily_file_sink.h
index 83b63e1a..d200480f 100644
--- a/include/spdlog/sinks/daily_file_sink.h
+++ b/include/spdlog/sinks/daily_file_sink.h
@@ -78,12 +78,7 @@ public:
 protected:
     void sink_it_(const details::log_msg &msg) override
     {
-#ifdef SPDLOG_NO_DATETIME
-        auto time = log_clock::now();
-#else
         auto time = msg.time;
-#endif
-
         bool should_rotate = time >= rotation_tp_;
         if (should_rotate)
         {
diff --git a/include/spdlog/sinks/dup_filter_sink.h b/include/spdlog/sinks/dup_filter_sink.h
index ab116a05..ab501387 100644
--- a/include/spdlog/sinks/dup_filter_sink.h
+++ b/include/spdlog/sinks/dup_filter_sink.h
@@ -33,10 +33,6 @@
 //       [2019-06-25 17:50:56.512] [logger] [info] Skipped 3 duplicate messages..
 //       [2019-06-25 17:50:56.512] [logger] [info] Different Hello
 
-#ifdef SPDLOG_NO_DATETIME
-#error "spdlog::sinks::dup_filter_sink: cannot work when SPDLOG_NO_DATETIME is defined"
-#endif
-
 namespace spdlog {
 namespace sinks {
 template<typename Mutex>
diff --git a/include/spdlog/tweakme.h b/include/spdlog/tweakme.h
index 2f3241b8..b67043e0 100644
--- a/include/spdlog/tweakme.h
+++ b/include/spdlog/tweakme.h
@@ -19,19 +19,6 @@
 // #define SPDLOG_CLOCK_COARSE
 ///////////////////////////////////////////////////////////////////////////////
 
-///////////////////////////////////////////////////////////////////////////////
-// Uncomment if date/time logging is not needed and never appear in the log
-// pattern.
-// This will prevent spdlog from querying the clock on each log call.
-//
-// WARNING: If the log pattern contains any date/time while this flag is on, the
-// result is undefined.
-//          You must set new pattern(spdlog::set_pattern(..") without any
-//          date/time in it
-//
-// #define SPDLOG_NO_DATETIME
-///////////////////////////////////////////////////////////////////////////////
-
 ///////////////////////////////////////////////////////////////////////////////
 // Uncomment if thread id logging is not needed (i.e. no %t in the log pattern).
 // This will prevent spdlog from querying the thread id on each log call.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c3b346cc..14c03287 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -22,6 +22,7 @@ set(SPDLOG_UTESTS_SOURCES
     main.cpp
     test_mpmc_q.cpp
     test_sink.h
+	test_dup_filter.cpp
     test_fmt_helper.cpp
   	test_stdout_api.cpp
 	test_backtrace.cpp
@@ -35,12 +36,6 @@ if(systemd_FOUND)
 	list(APPEND SPDLOG_UTESTS_SOURCES test_systemd.cpp)
 endif()
 
-if(NOT SPDLOG_NO_DATETIME)
-	list(APPEND SPDLOG_UTESTS_SOURCES test_dup_filter.cpp)
-endif()
-
-
-
 
 enable_testing()