Select data from specific hours
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Problem
You may want to select data from specific hours of the day. For example, you may only want data within normal business hours (9am - 5pm).
Solution 1
Use hourSelection() to filter data by a specific hour range in each day.
import "date"
from(bucket: "example-bucket")
|> range(start: -7d)
|> filter(fn: (r) => r["_measurement"] == "example-measurement")
|> filter(fn: (r) => r["_field"] == "example-field")
|> hourSelection(start: 9, stop: 17)
Solution 2
Use date.hour() to evaluate hours in a filter() predicate.
import "date"
from(bucket: "example-bucket")
|> range(start: -7d)
|> filter(fn: (r) => r["_measurement"] == "example-measurement")
|> filter(fn: (r) => r["_field"] == "example-field")
|> filter(fn: (r) => date.hour(t: r["_time"]) > 9 and date.hour(t: r["_time"]) < 17)
This solution also applies if you to select data from certain seconds in a minute, minutes in an hour, days in the month, months in the year, etc. Use the [Flux `date` package](/flux/v0.x/stdlib/date/) to assign integer representations to your data and filter for your desired schedule.
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