How to retrieve rss feed Gnews over a period of time?

i use this script :

https://gist.github.com/cyberandy/807d5623d842a44c6010af92c478963e

it's works fine , but i want all rss feed over a period of time , e.g from 01/01/21 to 01/03/21 because this script construct an URL like this:
https://news.google.com/rss/search?q="market"&hl=it&ceid=EN%3Aen
it save only 100 items . I need more data for my project. How can i modify this script?

i find the parameter +when: to specify the maximun date of a news , but the xml file have only 100 items.Does it exist collection of rss feed of financial news rss feeed?

Anyone can help me ?