docs-v2/content/flux/v0/stdlib/experimental/aligntime.md

title	description	menu	weight	flux/v0/tags	introduced
experimental.alignTime() function	`experimental.alignTime()` shifts time values in input tables to all start at a common start time.	flux_v0_ref name parent identifier experimental.alignTime experimental experimental/alignTime	101	transformations date/time	0.66.0

experimental.alignTime() shifts time values in input tables to all start at a common start time.

Function type signature

(<-tables: stream[B], ?alignTo: A) => stream[C] where B: Record, C: Record

{{% caption %}} For more information, see Function type signatures. {{% /caption %}}

Parameters

alignTo

Time to align tables to. Default is 1970-01-01T00:00:00Z.

tables

Input data. Default is piped-forward data (<-).

Examples

Compare month-over-month values

1. Window data by calendar month creating two separate tables (one for January and one for February).
2. Align tables to 2021-01-01T00:00:00Z.

Each output table represents data from a calendar month. When visualized, data is still grouped by month, but timestamps are aligned to a common start time and values can be compared by time.

import "experimental"

data
    |> window(every: 1mo)
    |> experimental.alignTime(alignTo: 2021-01-01T00:00:00Z)

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Input data

*_start	*_stop	_time	_value
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-01T00:00:00Z	32.1
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-02T00:00:00Z	32.9
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-03T00:00:00Z	33.2
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-04T00:00:00Z	34
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-02-01T00:00:00Z	38.3
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-02-02T00:00:00Z	38.4
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-02-03T00:00:00Z	37.8
2021-01-01T00:00:00Z	2021-03-01T00:00:00Z	2021-02-04T00:00:00Z	37.5

Output data

*_start	*_stop	_time	_value
2021-01-01T00:00:00Z	2021-02-01T00:00:00Z	2021-01-01T00:00:00Z	32.1
2021-01-01T00:00:00Z	2021-02-01T00:00:00Z	2021-01-02T00:00:00Z	32.9
2021-01-01T00:00:00Z	2021-02-01T00:00:00Z	2021-01-03T00:00:00Z	33.2
2021-01-01T00:00:00Z	2021-02-01T00:00:00Z	2021-01-04T00:00:00Z	34

*_start	*_stop	_time	_value
2021-02-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-01T00:00:00Z	38.3
2021-02-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-02T00:00:00Z	38.4
2021-02-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-03T00:00:00Z	37.8
2021-02-01T00:00:00Z	2021-03-01T00:00:00Z	2021-01-04T00:00:00Z	37.5

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