Create Date Automatic with Flow Variable

Hello Mr/Mrs,

I just use knime a few days ago. anyone can suggest me for solve my problem. I want to create date use Create Date&Time Range Node automatically with flow variable. The workflow can be like this.

Report that I do on November, then automatically create date from October,1 - October 31.

Report that I do on December, then automatically create date from November,1 - November 30.

and so on.

here I also show the output what I want.

I have idea to month from use excecution time minus by 1 but I confused to execute that.

sorry if my english not good enough.

big thanks,

Nanda