Custom date picker not updating lineprotocol timestamps with chosen date

While reviewing code examples for `influxdb3-go` in _Cloud Serverless_ I noticed two problems.

1. First the date selector feature is not updating the timestamp in the descriptive paragraph with the correct date. It seems to be one day earlier than the date selected.
2. The timestamps in the code samples are not being updated. This applies to the line protocol example under the heading _Home sensor data line protocol_ and to the line protocol string slice in the Go example.

An initial view.

Open the date picker.

Select the new date.

The updated page

##### Relevant URLs
- https://docs.influxdata.com/influxdb3/cloud-serverless/get-started/write/?t=Go

Also from local build of latest (commit 97c76d590c7925ce68a2811b147fdc0fc11960f3) in branch master started with `npx hugo server`.

http://localhost:1313/influxdb3/cloud-serverless/get-started/write/?t=Go

Open the Cloud Serverless write page at the linked URL and run the local site with `npx hugo server` as described. Find the date-picker behavior and the Home sensor data line protocol and Go line protocol examples, then verify that selecting a date updates the descriptive date and every displayed timestamp to that date.

Written by the indexing model from the issue text.