Nick here from Shopify.
Good question. This is something you would be able to do via the admin. You would take the following steps to do this:
From your Shopify admin, go to Customers.
Select the filter and conditions that you want, as well as a value.
Click Add filter.
You can repeat these steps to add multiple filters should you wish also.
There are many different criteria you can filter the customers by one of which is the date an order was placed. Which I believe is what will fit what you are looking for. Shopify has a helpful guide that goes into this in more detail which you can see here.
Hope this helps and don't hesitate to ask should you have any other questions about anything.
All the best, Nick
P.S. I have moved this post to the Shopify discussion topic where it suits much better than the Build a Business topic.