This should be set to Utc not Unspecified, causes all sorts of problems with serializers downstream. Using the following workaround at the moment:
foreach (DateEntry e in hourlyLikes)
{
PropertyInfo f = typeof(DateEntry).GetProperty("Time", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
if (null != f)
f.SetValue(e, DateTime.SpecifyKind(e.Time, DateTimeKind.Utc));
}