diff --git a/wakatime/__init__.py b/wakatime/__init__.py
index 2f96d1a..301a22c 100644
--- a/wakatime/__init__.py
+++ b/wakatime/__init__.py
@@ -65,10 +65,6 @@ def parseArguments(argv):
             type=float,
             help='optional floating-point unix epoch timestamp; '+
                 'uses current time by default')
-    parser.add_argument('--endtime', dest='endtime',
-            help='optional end timestamp turning this action into '+
-                'a duration; if a non-duration action occurs within a '+
-                'duration, the duration is ignored')
     parser.add_argument('--write', dest='isWrite',
             action='store_true',
             help='note action was triggered from writing to a file')
@@ -124,7 +120,7 @@ def get_user_agent(plugin):
 
 
 def send_action(project=None, branch=None, stats={}, key=None, targetFile=None,
-        timestamp=None, endtime=None, isWrite=None, plugin=None, **kwargs):
+        timestamp=None, isWrite=None, plugin=None, **kwargs):
     url = 'https://www.wakati.me/api/v1/actions'
     log.debug('Sending action to api at %s' % url)
     data = {
@@ -135,8 +131,6 @@ def send_action(project=None, branch=None, stats={}, key=None, targetFile=None,
         data['lines'] = stats['lines']
     if stats.get('language'):
         data['language'] = stats['language']
-    if endtime:
-        data['endtime'] = endtime
     if isWrite:
         data['is_write'] = isWrite
     if project:
diff --git a/wakatime/log.py b/wakatime/log.py
index 665c0b6..29a8e95 100644
--- a/wakatime/log.py
+++ b/wakatime/log.py
@@ -30,9 +30,8 @@ class CustomEncoder(json.JSONEncoder):
 
 class JsonFormatter(logging.Formatter):
 
-    def setup(self, timestamp, endtime, isWrite, targetFile, version, plugin):
+    def setup(self, timestamp, isWrite, targetFile, version, plugin):
         self.timestamp = timestamp
-        self.endtime = endtime
         self.isWrite = isWrite
         self.targetFile = targetFile
         self.version = version
@@ -44,14 +43,11 @@ class JsonFormatter(logging.Formatter):
             ('version', self.version),
             ('plugin', self.plugin),
             ('time', self.timestamp),
-            ('endtime', self.endtime),
             ('isWrite', self.isWrite),
             ('file', self.targetFile),
             ('level', record.levelname),
             ('message', record.msg),
         ])
-        if not self.endtime:
-            del data['endtime']
         if not self.plugin:
             del data['plugin']
         if not self.isWrite:
@@ -81,7 +77,6 @@ def setup_logging(args, version):
     formatter = JsonFormatter(datefmt='%a %b %d %H:%M:%S %Z %Y')
     formatter.setup(
         timestamp=args.timestamp,
-        endtime=args.endtime,
         isWrite=args.isWrite,
         targetFile=args.targetFile,
         version=version,