Consider the following scenario:
You use Microsoft SQL Server 2012 Reporting Services (SSRS 2012) or SSRS 2014.
You deploy a report to the Report Server and set it up for execution snapshots.
The snapshot has been executed for at least one time.
You browse the Report Manager through the URL http://<Server>/<Reports>, and then click Details View.
In this scenario, the date value in the Last Run column in Details View is blank.
Note The Last Run column contains the date and time values of the most recent snapshot execution for the corresponding report.
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.