chore: fix test failing on Windows due to timezone issue #401

consumer/src/test/groovy/au/com/dius/pact/consumer/dsl/DslSpec.groovy

@@ -1,15 +1,18 @@
 package au.com.dius.pact.consumer.dsl
 
-import au.com.dius.pact.core.model.matchingrules.DateMatcher
 import au.com.dius.pact.core.model.matchingrules.MatchingRuleCategory
 import au.com.dius.pact.core.model.matchingrules.MatchingRuleGroup
 import au.com.dius.pact.core.model.matchingrules.RegexMatcher
+import au.com.dius.pact.core.model.matchingrules.TimestampMatcher
 import au.com.dius.pact.core.model.matchingrules.TypeMatcher
 import au.com.dius.pact.core.model.matchingrules.ValuesMatcher
 import spock.lang.Issue
 import spock.lang.Specification
 import spock.lang.Unroll
 
+import java.time.OffsetDateTime
+import java.time.ZoneOffset
+
 class DslSpec extends Specification {
 
   @Unroll
@@ -34,8 +37,9 @@ class DslSpec extends Specification {
   @Issue('#401')
   def 'eachKeyMappedToAnArrayLike does not work on "nested" property'() {
     given:
+    def instant = OffsetDateTime.of(2000, 2, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant()
     def body = new PactDslJsonBody()
-      .date('date', "yyyyMMdd'T'HHmmss")
+      .datetime('date', "yyyyMMdd'T'HHmmss", instant, TimeZone.getTimeZone('GTM'))
       .stringMatcher('system', '.+', 'systemname')
       .object('data')
         .eachKeyMappedToAnArrayLike('subsystem_name')
@@ -50,7 +54,7 @@ class DslSpec extends Specification {
     result.body.toString() ==
       '{"data":{"subsystem_name":[{"id":"1234567"}]},"date":"20000201T000000","system":"systemname"}'
     result.matchers == new MatchingRuleCategory('body', [
-      '$.date': new MatchingRuleGroup([new DateMatcher("yyyyMMdd'T'HHmmss")]),
+      '$.date': new MatchingRuleGroup([new TimestampMatcher("yyyyMMdd'T'HHmmss")]),
       '$.system': new MatchingRuleGroup([new RegexMatcher('.+')]),
       '$.data': new MatchingRuleGroup([ValuesMatcher.INSTANCE]),
       '$.data.*[*].id': new MatchingRuleGroup([TypeMatcher.INSTANCE])