gistfile1.js

var client = new TempoDBClient('api-key', 'api-secret')
var cb = function(result,err){
  console.log(result)
}
var time = new Date('2013-11-07');

client.write_key('São Paulo', [{t: time, v: 12.34}], cb)

setTimeout(function() {
  client.read_key('São Paulo', new Date('2013-11-07'), new Date('2013-11-08'), {}, cb)
}, 2000)

Output

{ response: 200, body: '' } //The write
{ response: 200,            //The read
  body:
   { series:
      { id: 'e61390b2cf0b47688c2d54af7ff742b4',
        key: 'São Paulo',
        name: '',
        tags: [],
        attributes: {} },
     start: '2013-11-07T00:00:00.000Z',
     end: '2013-11-08T00:00:00.000Z',
     data: [ [Object] ],
     rollup: null,
     summary:
      { sum: 12.34,
        mean: 12.34,
        max: 12.34,
        min: 12.34,
        stddev: 0,
        ss: 0,
        count: 1 } } }