diff --git a/plot_transmission_timeline.py b/plot_transmission_timeline.py
index b2c8683..16430d0 100755
--- a/plot_transmission_timeline.py
+++ b/plot_transmission_timeline.py
@@ -148,7 +148,7 @@ if __name__ == "__main__":
     print(transmission_df)
 
     # create timedelta range with maximum timedelta
-    time_range = pd.timedelta_range(transmission_df.index.min(), transmission_df.index.max(), freq="{}s".format(args.interval))
+    time_range = pd.date_range(transmission_df.index.min(), transmission_df.index.max(), freq="{}s".format(args.interval))
 
     # create bins by pd.cut, aggregate sum
     transmission_df = transmission_df.groupby(pd.cut(transmission_df.index, bins=time_range, labels=time_range[:-1]))["goodput"].sum().reset_index()