I need the backup name to include today's date when using MSSQL RDS backups

Question

I am creating a stored procedure that is making backups straight from RDS MSSQL to S3. I need the backup name that gets placed in S3 to include today's date, thus, I need to include a Parameter (@NOW) in the name.

ALTER PROC [dbo].[USP_DatabaseFullBackup]
AS
DECLARE @NOW DATETIME,        
@SERVERNAME VARCHAR(100) 

SET @NOW = (SELECT GETDATE())
SET @SERVERNAME = (@@SERVERNAME)

BEGIN 
exec msdb.dbo.rds_backup_database 
@source_db_name='MyDB',  
@overwrite_S3_backup_file=0,
@s3_arn_to_backup_to='arn:aws:s3:::MyBucket/Backups/FULL/MyDB'+@NOW+''
END'