Variable Defination in page URL

Variable Defination in page URL

Hello There 

I have a page created and I wanted to define a variable value in URL 

here my example report url in zoho creator

https://app.zohocreator.com/saldo/appname/#Page:Report_Page_Q1?Date_Selected = Year_Q1;

but his does not work since I have to declare Date_Selected  in the page some how

Like this 

Date_Selected ="";

so this decleration re-write my URL parameter so paramater would eliminate. 

so I decided not to declate variable in coding but in that case I can not use the URL variable 

Any idea ? how to do it ?