Hi,
I could do this by creating a simple database which would be queried from your app.
From what I understand it would have two columns in the table, Date and Number.
You could query just on the specific date or all dates in a certain period e.g. 4/20/18- 4/25/18.
I would like to hear more details from you if you would consider me for the job.
Im happy to do it cheap as I am new to Freelancer.