timebucket

group timestamps into "buckets" by applying a granularity to a discrete value

npm install timebucket
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timebucket

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Group timestamps into "buckets" by applying a granularity to a discrete value

A timebucket is a type of time domain which combines a size identifier (granularity) with a discrete value, and can be stored as a compact string.

Timebuckets are useful for grouping timestamps together using a particular granularity (such as groups of 30 minutes), as an aid for graphing or map/reduce-ing time-series data.

Also, timebuckets can serve as a neutral format between which UNIX timestamps (seconds before or after 1970), millisecond timestamps (as used in JavaScript), and microsecond timestamps (such as those used in high-frequency trading applications) can be converted, and stored in a complete way (with granularity attached).

Anatomy of a timebucket

A timebucket consists of:

  1. a size spec (string) which consists of:
    1. (optional) an unsigned multiplier (default: 1)
    2. a granularity identifier, i.e. s for seconds
  2. a signed value, i.e. number of seconds, after or before epoch year (1970)

Format examples

  • 8h-491 - time (within 8 hours) of first moonwalk (1969-07-21 02:56 UTC)
  • y43 - the year 2013

API

Construction

The timebucket module exports a factory function. It supports the following argument combinations:

  • timebucket() - build timebucket with millisecond granularity applied to current date
  • timebucket(size) - build from specific size (string identifier, see list below) applied to current date
  • timebucket(milliseconds) - build from milliseconds since 1970
  • timebucket(size, value) - build from specific size and value
  • timebucket(date) - build from date object with millisecond granularity
  • timebucket(str) - build from string representation

Resizing

To resize a bucket, call resize(newSize):

console.log(timebucket('y').resize('30m') + '');
// '30m753360'

Conversion

Conversion methods:

  • toString() - convert to string representation
  • toJSON() - same as toString()
  • toMilliseconds() - convert to millisecond UNIX time offset
  • toDate() - convert to Date object

API examples

var timebucket = require('timebucket');

// defaults to current milliseconds after unix epoch
console.log(timebucket() + '');
// 'ms1369656669680'

// default size (milliseconds) and value
console.log(timebucket(1369601120380) + '');
// 'ms1369601120380'

// specific size (seconds) and value
console.log(timebucket('s', 1369601125) + '');
// 's1369601125'

// resize to year
console.log(timebucket().resize('y') + '');
// 'y43'

// use current time, specific size
console.log(timebucket('30m') + '');
// '30m760920'

// create timebucket from current seconds after unix epoch, and add 5
console.log(timebucket('s').add(5) + '');
// 's1369656674'

// from date object
console.log(timebucket(new Date()) + '');
// 'ms1369656669686'

// from string representation
console.log(timebucket('y43') + '');
// 'y43'

// access granularity and value as properties
var t = timebucket();
console.log(t.size.value, t.size.granularity, t.value);
// 1 'ms' 1369656669686

// resize
console.log(timebucket('y').resize('30m') + '');
// '30m753360'

// from current microseconds (smallest supported bucket size)
console.log(timebucket('µs') + '');
// 'µs1369659466378060'

// resize from microseconds
console.log(timebucket('µs1369657390541000').resize('y') + '');
// 'y43'

Granularity identifiers

  • µs - microseconds
  • ms - milliseconds
  • s - seconds
  • m - minutes
  • h - hours
  • d - days
  • w - weeks
  • M - months
  • y - years

Integer storage

Timebuckets also have a 64-bit integer representation which contains granularity metadata, while maintaining sortability with buckets of the same granularity.

var timebucket = require('timebucket');
var num = timebucket('8h-491').toNumber();
// toNumber() returns a 64-bit integer representation as a Number
console.log(num);
// -49133
var bucket = timebucket.fromNumber(num);
// fromNumber() takes the result of toNumber(), and returns a timebucket instance:
console.log(bucket.toString());
// 8h-491

Developed by Terra Eclipse

Terra Eclipse, Inc. is a nationally recognized political technology and strategy firm located in Aptos, CA and Washington, D.C.


License: MIT

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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