use Date::Calc qw(Delta_YMDHMS Today_and_Now);

# @d arrays are (y,mon,d,h,min,s)
my @dt1 = Today_and_Now();
sleep(2);
my @dt2 = Today_and_Now();
my @dt = Delta_YMDHMS( @dt1, @dt2 );
printf "%02d/%02d/%04d %02d:$02d:$02d", @dt[2,1,0, 3..5];