# Business Days
Demonstrates how to calulcate business / working days. Please check with Omfax Systems support before following this guide as this example below relies on...
* The `syHolidays` table being populated with all public holidays
* The SQL function `fn_DueDate` being present (possibly not the case in older Keyfax versions)
Two script steps demonstrate this; the first asks for the number of business days and stores it in a Databox named Script.Business Days:
Example script demonstrating Business Days calculation
This [SQL Query](/product-suite/admin/entities/databoxes/sql-query.md) Databox executes the function `fn_DueDate`, supplying the Databox above and a country code (**EN**gland). The expression **PlusBusinessDays** is the one of interest:
SQL Databox
This Message references both Databoxes:
Message to display the results
For example...
The results as seen by the end-user
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