Bitfinex get credits and convert timestamp to JS Date
The problem is not with the timestamp, it's with your method of converting the timestamp to local time.

As this SO question describes, convert it this way:

var dt = new Date(0);
dt.setUTCSeconds(1454846632);
console.log(dt.toString());


Which prints Sun Feb 07 2016 07:03:52 GMT-0500 (EST).