Timeline file name timestamp in us (#15)

* file timestamp in us

Author: vandanavk

smdebug/core/tfevent/timeline_file_writer.py

@@ -329,7 +329,7 @@ def write_event(self, record):
         # write the trace event record
         position_and_length_of_record = self._writer.write(record.to_json() + ",\n")
         self.flush()
-        self.last_event_end_time = int(round(end_time_for_event))
+        self.last_event_end_time = int(round(record.event_end_ts_micros))
         return position_and_length_of_record
 
     def flush(self):

tests/core/test_timeline_writer.py

@@ -277,7 +277,7 @@ def test_utc_timestamp(simple_profiler_config_parser, timezone, out_dir):
     file_timestamp = int(path[0].split("_")[0])
 
     # file timestamp uses end of event
-    assert (time_in_utc + 20) == file_timestamp
+    assert (time_in_utc + 20) * CONVERT_TO_MICROSECS == file_timestamp
 
     start_time_since_epoch = 0
     idx = 0