From b988ec0f328a4f79e5d1b015305c0591d033b107 Mon Sep 17 00:00:00 2001
From: Helmut Merz <helmutm@cy55.de>
Date: Tue, 5 Apr 2016 08:57:32 +0200
Subject: [PATCH] try to avoid ValueError because of erroneous date

---
 composer/schema/field.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/composer/schema/field.py b/composer/schema/field.py
index 4619f95..16e5427 100644
--- a/composer/schema/field.py
+++ b/composer/schema/field.py
@@ -304,7 +304,10 @@ class DateFieldInstance(NumberFieldInstance):
             return ''
         if isinstance(value, basestring):
             return value
-        return strftime('%Y-%m-%dT%H:%M', value.timetuple())
+        try:
+            return strftime('%Y-%m-%dT%H:%M', value.timetuple())
+        except ValueError:
+            return ''
 
     def display(self, value):
         if value is None: