71 lines
1.9 KiB
Markdown
71 lines
1.9 KiB
Markdown
---
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title: now() function
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description: >
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`now()` is a function option that, by default, returns the current system time.
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menu:
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flux_v0_ref:
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name: now
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parent: universe
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identifier: universe/now
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weight: 101
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flux/v0/tags: [date/time]
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introduced: 0.7.0
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---
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<!------------------------------------------------------------------------------
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IMPORTANT: This page was generated from comments in the Flux source code. Any
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edits made directly to this page will be overwritten the next time the
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documentation is generated.
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To make updates to this documentation, update the function comments above the
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function definition in the Flux source code:
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https://github.com/influxdata/flux/blob/master/stdlib/universe/universe.flux#L43-L43
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Contributing to Flux: https://github.com/influxdata/flux#contributing
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Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md
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------------------------------------------------------------------------------->
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`now()` is a function option that, by default, returns the current system time.
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#### now() vs system.time()
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`now()` returns the current system time (UTC). `now()` is cached at runtime,
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so all executions of `now()` in a Flux script return the same time value.
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`system.time()` returns the system time (UTC) at which `system.time()` is executed.
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Each instance of `system.time()` in a Flux script returns a unique value.
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##### Function type signature
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```js
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() => time
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```
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{{% caption %}}
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For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
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{{% /caption %}}
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## Examples
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- [Use the current UTC time as a query boundary](#use-the-current-utc-time-as-a-query-boundary)
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- [Define a custom now time](#define-a-custom-now-time)
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### Use the current UTC time as a query boundary
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```js
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data
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|> range(start: -10h, stop: now())
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```
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### Define a custom now time
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```js
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option now = () => 2022-01-01T00:00:00Z
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```
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