creating files with specific dates in the past - for testing file cleanup logic. (node.js)

gistfile1.txt

const fs = require('fs');

const dir = '/tmp';
const now = Date.now();
const tmp = Date.now();
const dates = {
  _31days: new Date(now - 31 * 24 * 60 * 60 * 1000),
  _30days: new Date(now - 30 * 24 * 60 * 60 * 1000),
  _29days: new Date(now - 29 * 24 * 60 * 60 * 1000),
  _28days: new Date(now - 28 * 24 * 60 * 60 * 1000),
  _27days: new Date(now - 27 * 24 * 60 * 60 * 1000),
  _26days: new Date(now - 26 * 24 * 60 * 60 * 1000),
  _25days: new Date(now - 25 * 24 * 60 * 60 * 1000),
  _24days: new Date(now - 24 * 24 * 60 * 60 * 1000),
  _23days: new Date(now - 23 * 24 * 60 * 60 * 1000),
  _22days: new Date(now - 22 * 24 * 60 * 60 * 1000),
  _21days: new Date(now - 21 * 24 * 60 * 60 * 1000),
  _20days: new Date(now - 20 * 24 * 60 * 60 * 1000),
  _19days: new Date(now - 19 * 24 * 60 * 60 * 1000),
  _18days: new Date(now - 18 * 24 * 60 * 60 * 1000),
  _17days: new Date(now - 17 * 24 * 60 * 60 * 1000),
  _16days: new Date(now - 16 * 24 * 60 * 60 * 1000),
  _15days: new Date(now - 15 * 24 * 60 * 60 * 1000),
  _14days: new Date(now - 14 * 24 * 60 * 60 * 1000),
  _13days: new Date(now - 13 * 24 * 60 * 60 * 1000),
  _12days: new Date(now - 12 * 24 * 60 * 60 * 1000),
  _11days: new Date(now - 11 * 24 * 60 * 60 * 1000),
  _10days: new Date(now - 10 * 24 * 60 * 60 * 1000),
};


Object.keys(dates).map(k => {
  const v = dates[k];
  console.log(`${k}: ${v.toISOString()}`);
  const fname = `${dir}/log${k}.json`;
  fs.writeFileSync(fname, '');
  fs.utimesSync(fname, v, v);
});