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.
A timebucket consists of:
8h-491- time (within 8 hours) of first moonwalk (
y43- the year 2013
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
toString()- convert to string representation
toJSON()- same as
toMilliseconds()- convert to millisecond UNIX time offset
toDate()- convert to Date object
var timebucket = ;// defaults to current milliseconds after unix epochconsole;// 'ms1369656669680'// default size (milliseconds) and valueconsole;// 'ms1369601120380'// specific size (seconds) and valueconsole;// 's1369601125'// resize to yearconsole;// 'y43'// use current time, specific sizeconsole;// '30m760920'// create timebucket from current seconds after unix epoch, and add 5console;// 's1369656674'// from date objectconsole;// 'ms1369656669686'// from string representationconsole;// 'y43'// access granularity and value as propertiesvar t = ;console;// 1 'ms' 1369656669686// resizeconsole;// '30m753360'
Timebuckets also have a 64-bit integer representation which contains granularity metadata, while maintaining sortability with buckets of the same granularity.
var timebucket = ;var num = ;// toNumber() returns a 64-bit integer representation as a Numberconsole;// -49133var bucket = timebucket;// fromNumber() takes the result of toNumber(), and returns a timebucket instance:console;// 8h-491
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