# Use Rules

This can be done by configuring a Rule and using its several functions.

# Use case

There may be a requirement to compute the number of remaining days from an expiry date. The Toolkit sampler below is configured to extract the value of the expiry date:

To compute and display the remainingDays value, the rule must be configured with the following targets and logic:

- rule target -
*remainingDays*column - path alias target -
*expiry*column - logic01 - Convert the
*expiry*column value to epoch using the rule's parseDate function. - logic02 - Subtract the converted
*expiry*value to the value of the now() function. The now() function extracts the current timestamp in epoch format. - logic03 - Divide the difference in logic02 by 86400. 86400 is the epoch format of 1 day.
- logic04 - Format the dividend in logic03 to display it as a whole number and with a "days" suffix

The resulting dataview is:

Here is the rule configuration for reference.

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