command to find when Linux OS is installed?

UNIX for Advanced & Expert Users
1

hey ,
Anyone knows command to find when Linux OS is installed?
Date and time?

2

AFAIK there is no standard linux command for what you want to do.

For Fedora/Redhat/Centos you can figure it out from the date of the /root/install.log or from the contents of /root/install.log.syslog.

3 
uname

As in:

case $(uname) in
     Linux) : some linux command ;;
     FreeBSD) : some FreeBSD command ;;
     *) : ??? ;;
esac

date

Just the date:

date +%Y-%m-%d

Just the time:

date +%H:%M:%S

Read the man page for all the formatting options.