Incorrectly converting stripe timestamps to DateTimes

[ericallam]

Currently timestamps are hydrated to Dates using the following function:

export const toDateTime = (secs: number) => {
  var t = new Date('1970-01-01T00:30:00Z'); // Unix epoch start.
  t.setSeconds(secs);
  return t;
};

A couple issues here:

• Unix epoch is starting 30 minutes late
• You could just do new Date(secs * 1000)

[leerob]

#278