awk  'BEGIN { 
 ## you do the maths...this may not be correct. calculate how many secs in 7 days
 onehr=60
 onemin=60
 oneday = ( onehr * onemin ) * 24
 sevendays = oneday * 7  
}
 day=substr($0,3,2)
 month=substr($0,5,2)
 year=substr($0,7,2)
 hr=substr($0,9,2)
 min=substr($0,11,2)
 t="20"year" "month" "day" "hr" "min" "00
 d=mktime(t)
 now=systime()
 if ( ( now - d ) >= sevendays ) {
  print $0
 }
}' file