commit 01ac9b8bb13a98649d65c3dd8716c987fd7d7f17
Author: David Sorber <david.sorber@gmail.com>
Date:   Fri Jan 11 15:23:10 2019 -0500

    Ugh; fix typo.

diff --git a/software/hbkcd/hbkcd/daemon.py b/software/hbkcd/hbkcd/daemon.py
index cce9359..e3d2e44 100755
--- a/software/hbkcd/hbkcd/daemon.py
+++ b/software/hbkcd/hbkcd/daemon.py
@@ -49,7 +49,7 @@ def datetime_diff(dt_start, dt_end):
     """ Helper function to calculate the elapsed time between to datetime 
     objects and return in a readable "HH::MM:SS" string format.
     """
-    elapsed = dt_end - dt_sart
+    elapsed = dt_end - dt_start
     hours, remainder = divmod(elapsed.total_seconds(), 3600)
     minutes, seconds = divmod(remainder, 60)
     elapsed_str = '{:02}:{:02}:{:02}'