my $t_sub = \&Module::Base::timestamp;
my $timestamp = $t_sub->();
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No exporting, no pollution, and faster execution than with subs localized through the symbol table. The latter of course is the case only if you don't take a reference to the sub prior to each execution.

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}