Last time a Stored Procedure was executed

DECLARE @proc_nm sysname;

-- select the procedure name here

SET @proc_nm = 'usp_test';

SELECT s.last_execution_time

FROM sys.dm_exec_query_stats s

    CROSS APPLY sys.dm_exec_query_plan(s.plan_handle) p

WHERE OBJECT_NAME(p.objectid, DB_ID('AdventureWorks')) = @proc_nm;