The last-link-up-time/last-link-down-time was introduced by RouterOS 6.22 nov/11/2014 (was not present in 6.20).
To see these values from the command-line, use
/interface print detail terse
This information is not present under the "/interface TYPE print detail" command, only the top-level "/interface print detail". Use "where type=FOO" to limit to a particular type. "terse" is required, otherwise the display will be shortened to fit your terminal width and the fields you want will probably be omitted.
/interface print detail terse where type=eoip