diff --git a/tile/base/internal/logging.cc b/tile/base/internal/logging.cc
index f14e07e..e04c4b7 100644
--- a/tile/base/internal/logging.cc
+++ b/tile/base/internal/logging.cc
@@ -389,7 +389,7 @@ LogSink::ToString(LogSeverity severity,
 {
     std::stringstream ss;
     char date_time[64];
-    sprintf(date_time, "%4d-%02d-%02dT%02d:%02d:%02d.%06d", logmsgtime.year() + 1900, logmsgtime.month(),
+    sprintf(date_time, "%4d-%02d-%02dT%02d:%02d:%02d.%06d", logmsgtime.year() + 1900, logmsgtime.month() + 1,
             logmsgtime.day(), logmsgtime.hour(), logmsgtime.min(), logmsgtime.sec(), logmsgtime.usec());
 
     ss << date_time;
diff --git a/tile/base/logging/basic_file_sink.cc b/tile/base/logging/basic_file_sink.cc
index 38d5210..6648d0b 100644
--- a/tile/base/logging/basic_file_sink.cc
+++ b/tile/base/logging/basic_file_sink.cc
@@ -23,6 +23,8 @@ BasicFileSink::Send(LogSeverity severity,
                     size_t message_len)
 {
     TILE_CHECK(!filepath_.empty(), "filepath is empty");
+    auto msg = ToString(severity, full_filename, base_filename, line, logmsgtime, message, message_len);
+    while (!msg.empty() && msg.back() != '\n') { msg.push_back('\n'); }
     ofs_ << std::string(message, message_len) << std::endl;
 }