MINIFICPP-1113 - Fix date for logging output

Signed-off-by: Arpad Boda <aboda@apache.org>

This closes #703
diff --git a/libminifi/src/core/logging/LoggerConfiguration.cpp b/libminifi/src/core/logging/LoggerConfiguration.cpp
index 55b9d90..72c53e1 100644
--- a/libminifi/src/core/logging/LoggerConfiguration.cpp
+++ b/libminifi/src/core/logging/LoggerConfiguration.cpp
@@ -49,7 +49,7 @@
 namespace core {
 namespace logging {
 
-const char* LoggerConfiguration::spdlog_default_pattern = "[%Y-%m-%ll %H:%M:%S.%e] [%n] [%l] %v";
+const char* LoggerConfiguration::spdlog_default_pattern = "[%Y-%m-%d %H:%M:%S.%e] [%n] [%l] %v";
 
 std::vector<std::string> LoggerProperties::get_keys_of_type(const std::string &type) {
   std::vector<std::string> appenders;