timebucket

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

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).

A timebucket consists of:

  1. a size spec (string) which consists of:
  2. (optional) an unsigned multiplier (default: 1)
  3. a granularity identifier, i.e. s for seconds
  4. a signed value, i.e. number of seconds, after or before epoch year (1970)
  • 8h-491 - time (within 8 hours) of first moonwalk (1969-07-21 02:56 UTC)
  • y43 - the year 2013

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

To resize a bucket, call resize(newSize):

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

Conversion methods:

  • toString() - convert to string representation
  • toJSON() - same as toString()
  • toMilliseconds() - convert to millisecond UNIX time offset
  • toDate() - convert to Date object
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' 
 
 
  • µs - microseconds
  • ms - milliseconds
  • s - seconds
  • m - minutes
  • h - hours
  • d - days
  • w - weeks
  • M - months
  • y - years

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.


  • Copyright (C) 2012 Carlos Rodriguez (http://s8f.org/)
  • Copyright (C) 2012 Terra Eclipse, Inc. (http://www.terraeclipse.com/)

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