# Date and time

Learn how to define an audience based on temporal information.

The date and time variables, such as [`today`](/reference/cql/context#evaluation), [`yesterday`](/reference/cql/context#evaluation), and [`now`](/reference/cql/context#evaluation), provide you with temporal information.

Suppose you have a recurring weekly promotion on Mondays, say Monday Madness. If you want an audience to match only on Monday, you can specify the following condition:

```cql
today's weekday is "monday"
```

And to check for a specific date, you can use:

```cql
today as string is "2023-04-08"
```

For more information on date and time variables, see the [Evaluation](/reference/cql/context#evaluation) section.