diff --git a/ccserver/jobs.py b/ccserver/jobs.py
index cc44ce011ba5a29674e1152a27add20feddfd725..ccf96a841528dd010be949d98500415c64148799 100644
--- a/ccserver/jobs.py
+++ b/ccserver/jobs.py
@@ -155,6 +155,7 @@ class BaseJob(dict, Thread, object):
             raise JobError('Job is done')
         if self['cancelled']:
             raise JobError('Job is already cancelled')
+
         self['cancelled'] = True
         self.report('cancelling')
 
@@ -168,17 +169,15 @@ class BaseJob(dict, Thread, object):
             if key.startswith('_') or (props is not None and key not in props):
                 continue
             if isinstance(val, datetime):
-                now = datetime.now()
-                dt = now - val
-                val = dt.seconds + dt.days * 86400
+                val = int(time.mktime(val.timetuple()))
 
             if key == 'duration':
                 if self['done']:
-                    dt = self['ended'] - self['started']
+                    dt = self['ended'] - self['created']
                     val = dt.seconds + dt.days * 86400
                 else:
                     now = datetime.now()
-                    dt = now - self['started']
+                    dt = now - self['created']
                     val = dt.seconds + dt.days * 86400
 
             exported[key] = str(val)