# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1508022194 -7200
# Node ID 8a9321e164b9ae0d48cc05e83870a5e66b8f499e
# Parent  cadb986c2dec16692e0bf563b06eaf1352b5badc
Handle erroneous form date information when attempting to convert to datetimes.

diff -r cadb986c2dec -r 8a9321e164b9 imipweb/data.py
--- a/imipweb/data.py	Sat Oct 14 19:10:43 2017 +0200
+++ b/imipweb/data.py	Sun Oct 15 01:03:14 2017 +0200
@@ -313,7 +313,9 @@
 
     def as_datetime(self, with_time=True):
 
-        "Return a datetime for this object."
+        """
+        Return a datetime for this object if one is provided or can be produced.
+        """
 
         # Return any original datetime details.
 
@@ -323,9 +325,14 @@
         # Otherwise, construct a datetime.
 
         s, attr = self.as_datetime_item(with_time)
-        if s:
+        if not s:
+            return None
+
+        # An erroneous datetime will yield None as result.
+
+        try:
             return get_datetime(s, attr)
-        else:
+        except ValueError:
             return None
 
     def as_datetime_item(self, with_time=True):