To automate the invocation of an AWS Lambda function at the end of each day, you can use Amazon EventBridge (formerly known as CloudWatch Events) to create a scheduled rule.

Create a Scheduled EventBridge Rule:

Open the Amazon EventBridge console at Amazon EventBridge Console.

Choose Create rule.

Provide a name and description for the rule.

For Rule type, choose Schedule.

Define a cron expression that runs the rule at the end of each day. For example, cron(0 0 * * ? *) runs the function at midnight UTC.

Set the Target:

In the Targets section, choose Add target.

For Target type, select Lambda function.

Choose the Lambda function you want to invoke.

Create the Rule:

Review the settings and choose Create rule.

This setup ensures that the Lambda function runs automatically at the specified time every day.

Amazon EventBridge Scheduler

Managing EventBridge Rules