within(new Date - 6e4); // => ""
within(new Date); // => "just now"
within(+new Date + 1e3); // =>  "in a second"
within(+new Date + 1e3 * 5); // => "in 5 seconds"
within(+new Date + 6e4); // => "in a minute"
within(+new Date + 6e4 * 5); // => "in 5 minutes"
within(+new Date + 6e4 * 60); // => "in an hour"
within(+new Date + 6e4 * 120); // => "in 2 hours"
within(+new Date + 8.64e+7); // => "in a day"
within(+new Date + 8.64e+7 * 2); // => "in 2 days"
within(+new Date + 8.64e+7 * 7); // => "in a week"
within(+new Date + 2.63e+9); // => "in a month"
within(+new Date + 2.63e+9 * 2); // => "in 2 months"
within(+new Date + 2.63e+9 * 12); // => "in a year"
within(+new Date + 3.156e+10 * 9); // => "in 9 years"
within(+new Date + 3.156e+10 * 10); // => "in a decade"