docs-v2/content/influxdb/cloud/reference/flux/stdlib/date/truncate.md

title	description	aliases	menu	weight
date.truncate() function	The `date.truncate()` function truncates a time to a specified unit.	/influxdb/cloud/reference/flux/functions/date/truncate/	influxdb_cloud_ref name parent date.truncate Date	301

The date.truncate() function truncates a time to a specified unit.

Function type: Transformation

import "date"

date.truncate(
  t: 2019-07-17T12:05:21.012Z,
  unit: 1s
)

// Returns 2019-07-17T12:05:21.000000000Z

Parameters

t

The time to operate on. Use an absolute time, relative duration, or integer. Durations are relative to now().

Data type: Time | Duration

unit

The unit of time to truncate to.

Data type: Duration

{{% note %}} Only use 1 and the unit of time to specify the unit. For example: 1s, 1m, 1h. {{% /note %}}

Examples

Truncate time values

import "date"

date.truncate(t: 2019-06-03T13:59:01.000000000Z, unit: 1s)
// Returns 2019-06-03T13:59:01.000000000Z

date.truncate(t: 2019-06-03T13:59:01.000000000Z, unit: 1m)
// Returns 2019-06-03T13:59:00.000000000Z

date.truncate(t: 2019-06-03T13:59:01.000000000Z, unit: 1h)
// Returns 2019-06-03T13:00:00.000000000Z

Truncate time values using durations

import "date"

option now = () => 2020-01-01T00:00:30.500000000Z

date.truncate(t: -30s, unit: 1s)
// Returns 2019-12-31T23:59:30.000000000Z

date.truncate(t: -1m, unit: 1m)
// Returns 2019-12-31T23:59:00.000000000Z

date.truncate(t: -1h, unit: 1h)
// Returns 2019-12-31T23:00:00.000000000Z