From what I can see looking in your workbook, you're not actually plotting 1 mark per month, but a mark for every day, but you want to control the axis labels. If you right-click the axis to 'edit axis' you'll see you have options to set the tick marks to fixed and specify a date and increment, but unfortunately the origin date can't be derived from another variable/parameter
I don't believe what you're trying to do is possible I'm afraid.
Thanks for your response. I did try that, but the issue with that is it's constant. I won't change as per the user's selection. I saw the below poll active in the community which may solve my issue, but we don't know if this going to be implemented anytime soon. I was checking if there are any workarounds or if I was missing something simple to achieve this.
Nope - doesn't sound like you were missing anything.
Please mark this thread with correct answer/assumed answered to close it down.
I believe this can be done with the parameter and a calculated field, but I am using version 10.5 and cannot open your twbx file. Can you resave and post in 10.5 format?