Koen Verbeeck (9/5/2013)
Tim Mitchell (9/5/2013)
You won't find that information in the package itself. If you have logging set up on the package, the logging information will give you that information. If you're using the SQL Server Agent to execute the package, you'll find the execution information in the Agent log (although it's still possible that the package could still have been executed outside of SQL Server Agent).
If you're using SSIS 2012 in catalog deployment mode, you can check the SSIS catalog tables for execution information.
And if you really want to be thorough, you can combine all three! :-D
It sounds over the top, but I do quite often check all three!
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