I have compiled what is mentioned in this question and [in this blog][1] and run it on my machine:
SELECT create_date FROM sys.databases WHERE name = 'tempdb'
select start_time from sys.traces
where is_default = 1
SELECT login_time FROM sys.dm_exec_sessions
WHERE session_id = 1;
SELECT sqlserver_start_time FROM sys.dm_os_sys_info;
EXEC sp_readerrorlog 0,1,'Copyright (c)'
SELECT MIN(start_time) as [Instance Started]
FROM [sys].[dm_exec_requests]
and
NET STATISTICS SERVER
All give a slightly different result. I usually use the first and the last one.
[1]: http://www.sqldbadiaries.com/2011/03/07/when-was-sql-server-restarted/
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