diff --git a/test/test_dawg.py b/test/test_dawg.py
index c6370e89f..77c4e419f 100644
--- a/test/test_dawg.py
+++ b/test/test_dawg.py
@@ -613,7 +613,7 @@ def test_dawg():
                     now, i, success, f_sum, e_sum, skip, 100. * success / i)
             )
 
-        earl_report = 'test_reports/rdflib_sparql-%s.ttl' % now
+        earl_report = 'test_reports/rdflib_sparql-%s.ttl' % now.replace(":", "")
 
         report.serialize(earl_report, format='n3')
         report.serialize('test_reports/rdflib_sparql-latest.ttl', format='n3')
diff --git a/test/testutils.py b/test/testutils.py
index 02bc4b231..20b060d3f 100644
--- a/test/testutils.py
+++ b/test/testutils.py
@@ -96,7 +96,7 @@ def nose_tst_earl_report(generator, earl_report_name=None):
     print("Ran %d tests, %d skipped, %d failed. "%(tests, skip, tests-skip-success))
     if earl_report_name:
         now = isodate.datetime_isoformat(datetime.datetime.utcnow())
-        earl_report = 'test_reports/%s-%s.ttl' % (earl_report_name, now)
+        earl_report = 'test_reports/%s-%s.ttl' % (earl_report_name, now.replace(":", ""))
 
         report.serialize(earl_report, format='n3')
         report.serialize('test_reports/%s-latest.ttl'%earl_report_name, format='n3')
diff --git a/test_reports/rdflib_nquads-2013-12-22T19:22:34.ttl b/test_reports/rdflib_nquads-2013-12-22T192234.ttl
similarity index 100%
rename from test_reports/rdflib_nquads-2013-12-22T19:22:34.ttl
rename to test_reports/rdflib_nquads-2013-12-22T192234.ttl
diff --git a/test_reports/rdflib_nt-2013-12-22T19:12:25.ttl b/test_reports/rdflib_nt-2013-12-22T191225.ttl
similarity index 100%
rename from test_reports/rdflib_nt-2013-12-22T19:12:25.ttl
rename to test_reports/rdflib_nt-2013-12-22T191225.ttl
diff --git a/test_reports/rdflib_sparql-2013-12-22T19:36:48.ttl b/test_reports/rdflib_sparql-2013-12-22T193648.ttl
similarity index 100%
rename from test_reports/rdflib_sparql-2013-12-22T19:36:48.ttl
rename to test_reports/rdflib_sparql-2013-12-22T193648.ttl
diff --git a/test_reports/rdflib_trig-2013-12-22T19:31:52.ttl b/test_reports/rdflib_trig-2013-12-22T193152.ttl
similarity index 100%
rename from test_reports/rdflib_trig-2013-12-22T19:31:52.ttl
rename to test_reports/rdflib_trig-2013-12-22T193152.ttl
diff --git a/test_reports/rdflib_trig-2013-12-30T15:56:57.ttl b/test_reports/rdflib_trig-2013-12-30T155657.ttl
similarity index 100%
rename from test_reports/rdflib_trig-2013-12-30T15:56:57.ttl
rename to test_reports/rdflib_trig-2013-12-30T155657.ttl
diff --git a/test_reports/rdflib_turtle-2013-12-22T19:13:51.ttl b/test_reports/rdflib_turtle-2013-12-22T191351.ttl
similarity index 100%
rename from test_reports/rdflib_turtle-2013-12-22T19:13:51.ttl
rename to test_reports/rdflib_turtle-2013-12-22T191351.ttl