# Expressions in selections

You can use date and datetime expressions in a selection and interact and use them in all the same ways that you can a date or datetime variable.

For example, let's imagine that you create an expression to identify the date at 10 months from the last booking date with the intention of sending a marketing reminder to book an annual holiday.

1. Create your date expression.
2. Drag and drop the expression onto a new selection window.
3. Select from the Type drop-down menu options - e.g. Today.
4. Build

You can use a data grid to verify:

In this example, there are 119 people and 141 bookings where, based on today being 5<sup>th</sup> November 2024, their last bookings were made on 5<sup>th</sup> January 2024, and who you might choose to target in a daily campaign to promote the booking of another holiday.

> [!NOTE]
>
> The ability to add date/date time expressions directly into a selection is significant because it means you don't have to create virtual variables in order to complete this type of analysis.

Related topics:

- [Data Grid: How do I use Expressions in a Data Grid?](<https://help.apteco.com/en/faststats/visualisation/data-grid/use-expressions/index.md>)
- [Using Variables in Selections](<https://help.apteco.com/en/faststats/analysis/selections/using-variables-in-selections/index.md>)