How to set the date value in the html input tag that uses the readonly attribute?

Hello. Please give me a solution for how to set the date value on the popup calendar when the html input tag uses the readonly attribute? I have tried changing the readonly attribute to false using a manual console in IE with a robot but it is less effective in the process, are there more effective ways? Please let me know. Thank you.

@umay can you share the url with such element to have a look?

Sorry @ashapkina this is an internal web, can not be accessed by anyone other than employees. Is there another way to try it besides using our web url?