The ls program will display mtime if you use "ls -l". And you can get atime or ctime with "ls -lu" or "ls -lc". But ls uses a strange format. It displays the month and day in all cases. If the timestamp is recent, it also displays hour and minute. If the timestamp is older than 6 months, it display the year instead of hour and minute. A clever script can reformat this to year, month, day, hour, and minute. But ls will not display the seconds. The gnu version of ls (which is usually the only version on linux) does have extended options like --fulltime. But these extended options are non-standard and won't be available on other versions of Unix.

The perl language is also non-standard, but perl tends to be available on most versions of unix. For example, a version of perl is supplied with HP-UX and Solaris. Perl can easily display the timestamps of files. Here are some perl one-liners to display atime, mtime, and ctime.