Fixes unit test.

src/DotNetCore.CAP/Internal/Helper.cs

@@ -10,15 +10,6 @@ namespace DotNetCore.CAP.Internal
 {
     public static class Helper
     {
-        private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Local)
-            .AddHours(TimeZoneInfo.Local.BaseUtcOffset.Hours);
-
-        public static long ToTimestamp(DateTime value)
-        {
-            var elapsedTime = value - Epoch;
-            return (long)elapsedTime.TotalSeconds;
-        }
-
         public static bool IsController(TypeInfo typeInfo)
         {
             if (!typeInfo.IsClass)

test/DotNetCore.CAP.Test/HelperTest.cs

@@ -7,19 +7,6 @@ namespace DotNetCore.CAP.Test
 {
     public class HelperTest
     {
-        [Fact]
-        public void ToTimestampTest()
-        {
-            //Arrange
-            var time = DateTimeOffset.Parse("2018-01-01T00:00:00Z");
-
-            //Act
-            var result = Helper.ToTimestamp(time.DateTime);
-
-            //Assert
-            Assert.Equal(1514736000, result);
-        }
-
         [Fact]
         public void IsControllerTest()
         {