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Try: bash + GNU date (slow):
for i in {1..5}; do
date -d "$i minutes ago" +%d-%m-%Y_%H-%M
done

Or ksh (fast):
for i in {1..5}; do
printf "%(%d-%m-%Y_%H-%M)T\n" "$i minutes ago"
done

Example :

$ cat f1
hostname MAC SWITCH_IP SWITCH_PORT
01HW1234 000 172.20.1.0 Fastethernet0
01HW4567 111 172.20.1.1 Fastethernet1
01HW1234 000 172.20.1.0 Fastethernet2$ cat f2
hostname MAC...

nawk 'NR==FNR{a[$1]=$1;b[$0]=$0;next}($1 in a)&& !($0 in b)' file1 file2


Thanks
SHa

awk 'NR==1{print}NR==FNR{a[$1]=$0;next}($1 in a)&&$0!=a[$1]' file1 file2


The code :
nawk 'NR==FNR{a[$1]=$0;next}($1 in a) {print}' file1 file2
May not behave the way you expect since it print...