Is there another AWS service that would allow me to publish a Topic to SNS at in an arbitrary date in the future?
I've looked into using Cloudwatch Events but that seems to be more for recurring events while I need one-time events.
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Lambda scheduled events, You can create a lambda function that will publish to an SNS topic.
You can create a Lambda function and direct AWS Lambda to execute it on a regular schedule. You can specify a fixed rate (for example, execute a Lambda function every hour or 15 minutes), or you can specify a Cron expression. For more information on expressions schedules, see Schedule Expressions Using Rate or Cron.