How to schedule an AWS lambda cron to run 7 days before the end of the month?

Question

I'm trying to schedule an AWS lambda to run 7 days before the end of the month, using the Serverless framework, but I just can't figure it out. Is there a way to specify a minus something with the L wildcard? Looks like L-7 doesn't work. Thanks.

Answer 1

You can use the following:

59 23 L-7 * ? *