the log format is as follows 
 log 
REQ    UP    15275791948097993    POST    /    {"Content-Length":"61926",xxxxxxxxxx}
REQ    UP    15275791948097993    POST    /    {"Content-Length":"61926",xxxxxxxxxx}grep xxxx log | awk-F""{print strftime ("% Y-%m-%d% H:%M:%S", $3) $0}"
when the timestamp is 10 digits, the above command can be executed normally and parse the correct time, but here the timestamp is 17 digits, how can the time be parsed normally?
