Gets remote log records using parameterized openquery

Get remote log.sql

declare @sql nvarchar(1000), @lastdate varchar(20)
-- looking for the data for the last 72 hours
select @lastdate = datediff(S,'1970-01-01', dateadd(hour, -72, getdate()))

print '--> Executing GetLog -->
SQL:' 

select @sql = '
select distinct
	partition, 
    	time = dateadd(S, [time_id], ''1970-01-01''), 
	data1, data2, data3, data4, data5
from openquery(LINKED_SERVER_1,
''select * 
from log 
where time_id >=' + @lastdate + ''')'+
' except select * from log'

print @sql
insert log
Exec sp_executesql @sql

print '<-- Exiting GetLog --'