when we call &today's_date parameter in drawing it takes the value as todays date. but when we check the properties of parameter it has became hard cord as mm-dd-yy instead of &today's_date. that means if we modify the file still it will referring the old date instead of newly modified date.
This post is currently located in an odd place on the community. Are you using Creo Parametric? If yes, are you interfacing with Windchill or is Creo being used completely stand-alone?
I think you're misunderstanding the purpose of &todays_date. It's not a parameter. It a token that is evaluated only once, either when it's added to a drawing or when a drawing is created from a template/format. During evaluation the token is replaced with the current date. Without Windchill, there is no way to display a dynamic date on a drawing (one that automatically updates) or any way to automatically display the last time something changed. The best you can do is create a mapkey that replaces a note or table cell's text with a new copy of &todays_date.