package MyStdMod;
use Time::HiRes qw|gettimeofday|;
use base 'Exporter';
our @EXPORTS = qw|gettimeofday|;

1;
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And then

#!/usr/bin/perl
use strict;
use warnings;
use 5.10.0;
use MyStdMod;

say MyStdMod::gettimeofday();
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I'm not sure if that is a good way to proceed.