Timestamp returned by InaSAFE crashes the keyword parser

[vdeparday]

InaSAFE returns a timestamp (see https://github.com/AIFDR/inasafe/blob/master/safe/engine/core.py#L99) and this timestamp has colon that are crashing the keyword parser.

As a workaround I commented this out locally in my InaSAFE package:

--- a/safe/engine/core.py
+++ b/safe/engine/core.py
@@ -96,7 +96,7 @@ def calculate_impact(layers, impact_fcn):
         F.keywords['%s_source' % cat] = source

    F.keywords['elapsed_time'] = elapsed_time_sec
-    F.keywords['time_stamp'] = time_stamp[:19]  # remove decimal part
+   #F.keywords['time_stamp'] = time_stamp[:19]  # remove decimal part
     F.keywords['host_name'] = host_name
     F.keywords['user'] = user

but it should be handled directly in safe-geonode