use strict;
undef $ENV{PERL_DATETIME_DEFAULT_TZ};
no warnings 'redefine';
## no critic (Variables::ProtectPrivateVars)
local *DateTime::_core_time = sub {0};
my $dt = DateTime->now;
is(
"$dt",
'1970-01-01T00:00:00',
'overriding DateTime::_core_time() works'
);
done_testing();