Fix exception raised when converting 12pm to 24hr format, also handles 12am.

Triggered when setting file modify time (e.g. during PP and also scheduled show updates).

CHANGES.md

@@ -31,6 +31,7 @@
 * Combined delete and remove buttons in to one on individual show pages
 * Other small UI tweaks
 * Fix keyerrors on backlog overview preventing the page to load
+* Fix exception raised when converting 12pm to 24hr format and handle 12am when setting file modify time (e.g. used during PP)
 
 [develop changelog]
 * Improve display of progress bars in the Downloads columns of the show list page

sickbeard/tv.py

@@ -2470,6 +2470,7 @@ class TVEpisode(object):
         if airs:
             hr = int(airs.group(1))
             hr = (12 + hr, hr)[None is airs.group(3)]
+            hr = (hr, hr - 12)[0 == hr % 12]
             min = int((airs.group(2), min)[None is airs.group(2)])
         airtime = datetime.time(hr, min)