Hi,

Have a look at the learning site: https://learning.intersystems.com
Please review below documentations as well:https://cedocs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=GCOS

https://cedocs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=GORIENT

Check this learning path:
learning paths for what you want such as Building Your First Application with Caché and Learn Caché for Developers.

Also check the video on how to start coding InterSystems Object Script with GitHub and VSCode on IRIS Community Edition. 

Thanks

Hi @Davidson Espindola 
First date of every month will be 1 which you can concat with current month and year however for last month you can use LAST_DAY cache function by passing any date of desire month.
SELECT LAST_DAY('2004-02-25')  

For details check below documentations:

https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY...

https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY...

Thanks