Return a date from seconds or milliseconds
If it's greater than 252489600000, it's milliseconds. This covers dates
since January 1st 1978 in milliseconds, and dates through the year 9970 in seconds.
var dateFromNum = require('date-from-num')
console.log(dateFromNum(1409759012000))
// Wed Sep 03 2014 08:43:32 GMT-0700 (PDT)
console.log(dateFromNum(1409759012))
// Wed Sep 03 2014 08:43:32 GMT-0700 (PDT)MIT