Is there a straight forward use of `date` to change
"seconds since the epoch" to some other date format?
I've worked on this on the command line but the
following lines best illustrate the problem.
@fir$ date +%s >time_tmp
@fir$ date >>time_tmp
@fir$ cat time_tmp
Wed Jan 6 15:26:05 PST 1999
@fir$ date +%D%t%r -f time_tmp
date: invalid date ` 915665157'
01/06/99 03:26:05 PM