I need help with a WFR for the opporutnity object that will update the Close Date with the first day of the current month and year.

So user enters the Close Date as 2/22/2021 and when saved the Close Date will update to 2/01/2021. I also do not want the Close Date to change when the stage is changed to Closed/Won.

Thank you. 

Is it possible to use Salesforce voice to auto-fill Vlocity Interaction Launcher when client receives a call? Would they need to set up aura? How would this be done?