Backport from HEAD:

invert date substraction to put activity in the past again [SF#842027].

Author: Johannes Gijsbers

roundup/cgi/templating.py

@@ -1051,7 +1051,7 @@ def reldate(self, pretty=1):
             return ''
 
         # figure the interval
-        interval = date.Date('.') - self._value
+        interval = self._value - date.Date('.')
         if pretty:
             return interval.pretty()
         return str(interval)