EuiSuperDatePicker UTC offset

[steve-offutt]

My team and I are using this library to mainly do review of logs. We have had a lot of success using your other components contained in this library. It's been great! However, there is one issue that I need help with. This application that we are using uses the EuiSuperDatePicker to filter and search through logs. The user is expected to perform the search in UTC as we get logs from all different timezones and the underlying logs are all standardized to UTC. While using this component we observe that when we select a datetime, May 5, 2020 @ 00:00:00.000 the EuiSuperDatePicker is converting that datetime to UTC (May 5, 2020 @ 05:00:00.000 suppose I live in CDT). What that means for us in our use case is that we must convert that back to May 5, 2020 @ 00:00:00.000.

While looking through this code base I noticed that EuiDatePicker has a utcOffset prop

eui/src/components/date_picker/date_picker.tsx

Line 161 in 6e6b556

utcOffset,

Is there a way that we can pass something similar to EuiSuperDatePicker so that we don't have to do these conversions?

-Thanks

[cchaos]

The underlying component within EuiSuperDatePicker are our regular EuiDatePickers so it stands to reason that we should be able to pass down the utcOffset prop.

[anishagg17]

Working on this one 🔧

[thompsongl]

After reviewing #3436, it doesn't appear that the utcOffset prop in EuiDatePicker does what it says/what we think.

In the docs, the actual UTC offset is done on selected value itself:

eui/src-docs/src/views/date_picker/utc.js

Lines 43 to 45 in 12074a5

	const selected =
	this.state.startDate &&
	this.state.startDate.clone().utcOffset(this.state.utcOffset);

And passing just the offset value via the utcOffset prop has no effect.

As such, simply passing through utcOffset to EuiSuperDatePicker also has no effect.

There are 0 usages in Kibana so it's hard to track correct usage and output.