UNIX for Advanced & Expert Users

$(date '+%d%m%y')

perl '-MPOSIX qw(strftime)' -le'
  print strftime "%a %b %e %H:%M:%S %Y", 
    localtime time - 86400 * shift;
  ' <n>

% perl '-MPOSIX qw(strftime)' -le'
  print strftime "%d%m%y", localtime time - 86400 * shift;
  ' 5
160111

MYVARIBLE="$(
  perl '-MPOSIX qw(strftime)' -le'
    print strftime "%d%m%y", localtime time - 86400 * shift;
    ' 5
    )"