public void ToUnixTimeInMilliseconds_DateTimeOffset_ShouldMatch()
        {
            var offset = new DateTimeOffset(2016, 1, 8, 4, 11, 28, TimeSpan.FromHours(7));
            var expected = offset.ToUnixTimeMilliseconds();
            var actual = offset.ToUnixTimeInMilliseconds();

            Assert.AreEqual(expected, actual);
        }