now() is a function option that, by default, returns the current system time.
now() vs 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.
Function type signature
() => time
Use the current UTC time as a query boundary
data |> range(start: -10h, stop: now())
Define a custom now time
option now = () => 2022-01-01T00:00:00Z
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