DateTime deserialization in redis

ServiceStack.Redis
1

I have a simple test that I am performing to ensure the registered ICacheClient is working correctly. For an MemoryCacheClient the test passes. However with a Redis ICacheClient the test fails.

Test Class

    public class CacheTest
    {
        public CacheTest()
        {
            Date = DateTime.Now;
            Title = "This is a test";
            i = 10001;
        }

        public bool Check(CacheTest orig)
        {
            if (orig == null)
            {
                return false;
            }

            if (DateTime.Compare(orig.Date, Date) != 0)
                return false;

            if (orig.Title != Title)
                return false;

            if (orig.i != i)
                return false;

            return true;
        }

        public DateTime Date { get; set; }
        public string Title { get; set; }
        public int i { get; set; }
    }

The test:

                string cacheKey = CacheHelper.CreateKey("test");
                Cache.Remove(cacheKey);
                var ct = new CacheTest();
                if (!Cache.Add<CacheTest>(cacheKey, ct))
                {
                    return new TestResponse() { Description = "Cache did not add properly", WasSuccessful = false };
                }
                else
                {
                    var result = Cache.Get<CacheTest>(cacheKey);
                    if (result.Check(ct))
                        tests += "Cache Online. ";
                    else
                    {
                        return new TestResponse() { Description = "Cache did not deserialize properly", WasSuccessful = false };
                    }
                }

The check for the DateTime fails.

Date.Ticks
636048233401150000
orig.Date.Ticks
636048233401153475

Why is precision being lost?

2

The Cache doesn’t get serialized in MemoryCacheClient it just keeps it in memory, it would get serialized in all other Caching providers. It may be a Time Zone issue, do you have any JsConfig configuration? and what is the DateKind of the deserialized date?

3

Only JsConfig setting:
JsConfig.ExcludeTypeInfo = true;

Date.Kind: local
orig.Date.Kind: local

4

Just had a look, the issue is just a precision issue with serializing dates which by default serializes using Unix Time ms, so any additional precision beyond that is discarded. These dates are equivalent minus sub ms fractions:

new DateTime().AddTicks(636048233401150000).ToString("O").Print();
new DateTime().AddTicks(636048233401153475).ToString("O").Print();

Which prints:

2016-07-22T22:29:00.1150000
2016-07-22T22:29:00.1153475

To keep the precision you can switch to an alternative date format like, e.g:

JsConfig.DateHandler = DateHandler.ISO8601;