An error occurred (SignatureDoesNotMatch) when calling the ListStacks operation: Signature expired...

[blackrhino]

$ aws cloudformation list-stacks

An error occurred (SignatureDoesNotMatch) when calling the ListStacks operation: Signature expired: 20181126T161809Z is now earlier than 20181126T161820Z (20181126T162320Z - 5 min.)

If you see this error your operating system date/time is wrong. Change it and it will work fine.