content/flux/v0/stdlib/universe/now.md
now() is a function option that, by default, returns the current system time.
now() returns the current system time (UTC). now() is cached at runtime,
so all executions of now() in a Flux script return the same time value.
system.time() returns the system time (UTC) at which system.time() is executed.
Each instance of system.time() in a Flux script returns a unique value.
() => time
{{% caption %}} For more information, see Function type signatures. {{% /caption %}}
data
|> range(start: -10h, stop: now())
option now = () => 2022-01-01T00:00:00Z