I created my first Zoho Creator Application. It consists of a basic form in which I record usage data by date. The form consists of 5 columns

Date               -  Value1 - Value2 - Value3 - Value4

01-01-2017  -  1000    - 2000    - 3000     - 4000

08-01-2017  -  1100    - 2200    - 3600     - 4050

16-01-2017  -  1201    - 2400    - 3800     - 4100

23-01-2017  -  1308    - 2600    - 3990     - 4150

How can I add a column that calculates the number of day since the last entry?

example

My goal is to calculate an daily number for Value1, 2, 3, and 4

Kind regards,

Wilco

(ZoHo Creator newby)