Lambda を使用して、Amazon EC2 インスタンスを一定の間隔で停止および起動するにはどうすればよいですか?

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource": "arn:aws:logs:*:*:*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "ec2:Start*",
        "ec2:Stop*"
      ],
      "Resource": "*"
    }
  ]
}

import boto3
region = 'us-west-1'
instances = ['i-12345cb6de4f78g9h', 'i-08ce9b2d7eccf6d26']
ec2 = boto3.client('ec2', region_name=region)

def lambda_handler(event, context):
    ec2.stop_instances(InstanceIds=instances)
    print('stopped your instances: ' + str(instances))

import boto3
region = 'us-west-1'
instances = ['i-12345cb6de4f78g9h', 'i-08ce9b2d7eccf6d26']
ec2 = boto3.client('ec2', region_name=region)

def lambda_handler(event, context):
    ec2.start_instances(InstanceIds=instances)
    print('started your instances: ' + str(instances))

AWSTemplateFormatVersion: '2010-09-09'
Description: Lambda function with cfn-response.
Parameters: 
  instances: 
    Default: i-12345678
    Description: Instance ID's seperated by commers 
    Type: String
  Region: 
    Description: region only 1 region supported 
    Type: String
  StopScheduled: 
    Default: cron(0 18 ? * MON-FRI *)
    Description: enter an Schedule expression example cron(0 18 ? * MON-FRI *) see https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html
    Type: String
  StartScheduled: 
    Default: cron(0 7 ? * MON-FRI *)
    Description: enter an Schedule expression example cron(0 7 ? * MON-FRI * ) see https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html
    Type: String
Resources:
  StopEC2Instances:
    Type: AWS::Lambda::Function
    Properties:
      Runtime: python3.8
      Role: !GetAtt Role.Arn
      Handler: index.lambda_handler
      Timeout: 60
      Environment:
         Variables:
          instances: !Ref instances
          Region: !Ref Region
      Code:
        ZipFile: |
          import json
          import re
          import os
          import boto3
          
          def lambda_handler(event, context):
            # TODO implement
            instances_str = os.environ['instances']
            region = os.environ['Region']
            ec2 = boto3.client('ec2', region_name=region)
            instances= re.findall(r"i-[0-9a-z]{17}|i-[0-9a-z]{8}", instances_str)
            print('stopped your instances: ' + str(instances) + "in Region "+ region)
            ec2.stop_instances(InstanceIds=instances)
            
            return {
              'statusCode': 200,
              'body': json.dumps('stopped your instances: ' + str(instances))
            }
      Description: Function that stops instances
  permissionForEventsToInvokeStopEC2Instances:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !GetAtt StopEC2Instances.Arn
      Action: lambda:InvokeFunction
      Principal: events.amazonaws.com
      "SourceArn" : !GetAtt StopScheduledRule.Arn

  StartEC2Instances:
    Type: AWS::Lambda::Function
    Properties:
      Runtime: python3.8
      Role: !GetAtt Role.Arn
      Handler: index.lambda_handler
      Timeout: 60
      Environment:
         Variables:
          instances: !Ref instances
          Region: !Ref Region
      Code:
        ZipFile: |
          import json
          import re
          import os
          import boto3
          
          def lambda_handler(event, context):
            # TODO implement
            instances_str = os.environ['instances']
            region = os.environ['Region']
            ec2 = boto3.client('ec2', region_name=region)
            instances= re.findall(r"i-[0-9a-z]{17}|i-[0-9a-z]{8}", instances_str)
            print('started your instances: ' + str(instances)+ "in Region "+ region)
            ec2.start_instances(InstanceIds=instances)
            
            return {
              'statusCode': 200,
              'body': json.dumps('started your instances: ' + str(instances))
            }
      Description: Function that started instances
  permissionForEventsToInvokeStartEC2Instances:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !GetAtt StartEC2Instances.Arn
      Action: lambda:InvokeFunction
      Principal: events.amazonaws.com
      "SourceArn" : !GetAtt StartScheduledRule.Arn

  Role:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
              - lambda.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      Path: /
      ManagedPolicyArns:
        - "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
      Policies:
        - PolicyName: Ec2permissions
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                - "ec2:StartInstances"
                - "ec2:StopInstances"
                Resource: '*'
                

  StopScheduledRule: 
    Type: AWS::Events::Rule
    Properties: 
      Description: "ScheduledRule"
      ScheduleExpression: !Ref StopScheduled
      State: "ENABLED"
      Targets: 
        - 
          Arn: !GetAtt StopEC2Instances.Arn
          Id: "TargetFunctionV1"
  StartScheduledRule: 
    Type: AWS::Events::Rule
    Properties: 
      Description: "ScheduledRule"
      ScheduleExpression: !Ref StartScheduled
      State: "ENABLED"
      Targets: 
        - 
          Arn: !GetAtt StartEC2Instances.Arn
          Id: "TargetFunctionV1"