The zero values give an unusual (although technically correct) answer.
Code:
> cat proc13.sh
#/usr/bin/bash
while read param etime
do
echo $param $(date '+%Y-%m-%d' -d @$etime)
done <file13
> proc13.sh
Fa1/14 1969-12-31
Se0/0/0 1969-12-31
Fa1/11 1969-12-31
Fa1/9 1969-12-31
Fa1/0 1969-12-31
Se0/0/1 2009-04-22
Gi1/0 1969-12-31
Fa0/0 2009-04-22
Fa1/3 1969-12-31
Fa1/8 1969-12-31
Fa1/15 1969-12-31
Fa1/13 1969-12-31
Fa1/10 1969-12-31
Fa1/1 1969-12-31
Fa1/12 2009-04-22
Fa0/1 2009-04-22
Fa1/5 2009-04-22
Fa1/6 1969-12-31
Se0/0/0.1 1969-12-31
Fa1/7 1969-12-31
Fa1/2 1969-12-31
Lo0 1969-12-31
Fa1/4 2009-04-22
