Convert Google Chrome bookmark timestamp to JS date

convert.ts

// A Webkit timestamp is the number of microseconds from "1st of Jan 1601"
// The magic number 11644473600 is the number of seconds between 
// "1st of Jan 1601" and "1st of Jan 1970"

export const converWebkitTimestamp = (webkitTimestamp: number): Date => {
  const dateInSeconds = Math.round(webkitTimestamp / 1000000) - 11644473600
  return new Date(dateInSeconds * 1000)
}