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to_char(
trunc(b.starttime/1000/60/60/24)+TO_DATE('1970-01-01 00:00:00', 'yyyy-MM-dd hh24:mi:ss'),
'yyyy-mm-dd')
||' '
||lpad(mod(trunc(b.starttime/1000/60/60),24),2,'0')
||':'
||lpad(mod(trunc(b.starttime/1000/60),60),2,'0')
||':'
||lpad(mod(trunc(b.starttime/1000),60),2,'0') as cdate