const CustomError = require("../extensions/custom-error");

const MODERN_ACTIVITY= 15; 
const HALF_LIFE_PERIOD= 5730;

module.exports = function dateSample(sampleActivity) {
  if(typeof +sampleActivity != Number) return false;
  return Math.ceil((Math.log(MODERN_ACTIVITY / sampleActivity) / (0.693 / HALF_LIFE_PERIOD)));
};
