Query to Check the SQL Server Restart time

SELECT Dateadd(s, ( ( -1 ) * ( osd.[ms_ticks] / 1000 ) ), Getdate()) AS serverrestartdatetime,

osd.sqlserver_start_time  FROM sys.[dm_os_sys_info] osd;

OR

SELECT

name,crdate  FROM sys.sysdatabases WHERE name = 'tempdb'