parseMilliseconds.js

gistfile1.js

function parseMilliseconds_ (timeframe) {
  var now = new Date().getTime();
  var milliseconds = {
    'hour': 60 * 60 * 1000,
    'day': 24 * 60 * 60 * 1000,
    'week': 7 * 24 * 60 * 60 * 1000,
    '4weeks': 4 * 7 * 24 * 60 * 60 * 1000
  };

  if (milliseconds[timeframe])
    return now - milliseconds[timeframe];

  if (timeframe === 'forever')
    return 0;

  return null;
}