diff --git a/src/test/groovy/net/fortuna/ical4j/model/DateTimeSpec.groovy b/src/test/groovy/net/fortuna/ical4j/model/DateTimeSpec.groovy
index 57cf649f6..bc1518f7a 100644
--- a/src/test/groovy/net/fortuna/ical4j/model/DateTimeSpec.groovy
+++ b/src/test/groovy/net/fortuna/ical4j/model/DateTimeSpec.groovy
@@ -112,7 +112,7 @@ class DateTimeSpec extends Specification {
                 }
         ]
 
-        dateTimeString << ['20110327T000000Z', '20110327T000000Z']
+        dateTimeString << ['20110327T000000', '20110327T000000']
     }
 
     def 'test date time initialisation with a registered custom timezone'() {
diff --git a/src/test/groovy/net/fortuna/ical4j/model/TemporalAmountAdapterTest.groovy b/src/test/groovy/net/fortuna/ical4j/model/TemporalAmountAdapterTest.groovy
index fcaf8e524..3134234ea 100644
--- a/src/test/groovy/net/fortuna/ical4j/model/TemporalAmountAdapterTest.groovy
+++ b/src/test/groovy/net/fortuna/ical4j/model/TemporalAmountAdapterTest.groovy
@@ -101,7 +101,7 @@ class TemporalAmountAdapterTest extends Specification {
 
         where:
         duration	| start				| expectedEnd
-        'P1D' | '20110326T110000Z' | '20110327T110000Z'
+        'P1D' | '20110326T110000' | '20110327T110000'
     }
 
     @Unroll