HP-UX

$ dmesg --v
dmesg from util-linux 2.20.1

$ cat time.pl 
#!/usr/bin/perl -wn
use strict;
 
foreach my $line (<>) {
    my ($uptime) = do { local @ARGV='/proc/uptime';<>}; ($uptime) = ($uptime =~ /^(\d+)\./);
    $line=~/^\[\s*(\d+)\.\d+\](.+)/;
    printf "[%s]%s\n", scalar localtime(time - $uptime + $1), $2;
}

$ dmesg | perl time.pl

Mar 17 15:59
gate64: sysvec_vaddr = 0xc0002000 for 2 pages
NOTICE: autofs_link(): File system was registered at index 3.
. etc

# dmesg | perl time.pl | more
syntax error at time.pl line 1, near "$ cat time"
"use" not allowed in expression at time.pl line 3, at end of line
Execution of time.pl aborted due to compilation errors.

#!/usr/bin/perl -wn
use strict;
foreach my $line (<>) {
    my ($uptime) = do { local @ARGV='/proc/uptime';<>}; ($uptime) = ($uptime =~ /^(\d+)\./);
    $line=~/^\[\s*(\d+)\.\d+\](.+)/;
    printf "[%s]%s\n", scalar localtime(time - $uptime + $1), $2;
}

Can't open /proc/uptime: No such file or directory at time.pl line 5.
Use of uninitialized value in pattern match (m//) at time.pl line 5.
Use of uninitialized value in subtraction (-) at time.pl line 7.
Use of uninitialized value in addition (+) at time.pl line 7.
Use of uninitialized value in printf at time.pl line 7.

dmesg | more