Revert "Update tests to use a custom timezone in the case where the local timezone happens to be UTC"

This reverts commit ef82866f90aa513b2d19f8f14a6d14427e7442ab.

Jint.Tests/Runtime/EngineTests.cs

@@ -750,9 +750,13 @@ namespace Jint.Tests.Runtime
         [Fact]
         public void UtcShouldUseUtc()
         {
-            const string customName = "Custom Time";
-            var customTimeZone = TimeZoneInfo.CreateCustomTimeZone(customName, new TimeSpan(7, 11, 0), customName, customName, customName, null, false);
-            var engine = new Engine(cfg => cfg.LocalTimeZone(customTimeZone)); 
+            if (TimeZoneInfo.Local.BaseUtcOffset.Equals(new TimeSpan(0)))
+            {
+                // Test is not valid if the Local timezone offset is the same as UTC
+                return;
+            }
+
+            var engine = new Engine();
 
             var result = engine.Execute("Date.UTC(1970,0,1)").GetCompletionValue().AsNumber();
             Assert.Equal(0, result);
@@ -801,11 +805,7 @@ namespace Jint.Tests.Runtime
         [InlineData("1970-01-01T00:00:00.000-00:00")]
         public void ShouldParseAsUtc(string date)
         {
-            const string customName = "Custom Time";
-            var customTimeZone = TimeZoneInfo.CreateCustomTimeZone(customName, new TimeSpan(7, 11, 0), customName, customName, customName, null, false);
-            var engine = new Engine(cfg => cfg.LocalTimeZone(customTimeZone));
-
-            engine.SetValue("d", date);
+            var engine = new Engine().SetValue("d", date);
             var result = engine.Execute("Date.parse(d);").GetCompletionValue().AsNumber();
 
             Assert.Equal(0, result);