From 7de47a7bc2f28e35b686efd9c3926874ffb77f03 Mon Sep 17 00:00:00 2001
From: Charles Haley <>
Date: Sat, 2 Oct 2010 16:17:25 +0100
Subject: [PATCH] Fix problem with custom date columns having an empty date
 format.

---
 src/calibre/utils/date.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/calibre/utils/date.py b/src/calibre/utils/date.py
index c5fba13f57..ec58c49628 100644
--- a/src/calibre/utils/date.py
+++ b/src/calibre/utils/date.py
@@ -120,6 +120,9 @@ def utcfromtimestamp(stamp):
 
 def format_date(dt, format, assume_utc=False, as_utc=False):
     ''' Return a date formatted as a string using a subset of Qt's formatting codes '''
+    if not format:
+        format = 'dd MMM yyyy'
+
     if hasattr(dt, 'tzinfo'):
         if dt.tzinfo is None:
             dt = dt.replace(tzinfo=_utc_tz if assume_utc else