Symptoms
Assume that you have Microsoft .NET Framework 4.7 installed on a computer. When you try to insert items into the Cache object by using the Cache.Insert (string, object, CacheDependency, DateTime, TimeSpan) Insert overload method, you may notice that the inserted Cache items expire much earlier or later than the specified DateTime (expiration time).
Cause
The internal implementation of System.Web.Caching.Cache uses Coordinated Universal Time (UTC) time-stamp for absolute expiration. But this particular Cache.Insert (string, object, CacheDependecy, DateTime, TimeSpan) Insert overload method does not make sure whether the expiration time is converted to UTC. Therefore, expiration for items that are inserted into the Cache object by using this overload will occur earlier or later than expected, depending on the computer time zone difference from Greenwich Mean Time (GMT).
Workaround
The temporary workaround for this issue is to use either the Cache.Add method or a different Cache.Insert overload method.
Resolution
This issue will be fixed in the next version of the .NET Framework, and will also be available in the next hotfix for the .NET Framework 4.7.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
