My first thought was that time in my $time = time(); might not be CORE::time(). But it doesn't seem to matter. 
use strict;
use warnings;

BEGIN {
  no warnings qw(redefine);
  *CORE::GLOBAL::time = sub { 4 };
}

use subs qw( time );
sub time { 5 }

my $time = time();

1;

[download]
main::(a.pl:12):        my $time = time();
  DB<1> n
main::(a.pl:14):        1;
  DB<1> x $time
0  5
  DB<2> x time()
0  5

[download]

Sorry, no idea.

In reply to Re^5: Where does time come from? CORE::GLOBAL:time no honored. by ikegami
in thread Where does time come from? CORE::GLOBAL:time no honored. by Anonymous Monk

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