> ## Documentation Index
> Fetch the complete documentation index at: https://docs.aseeflow.org/llms.txt
> Use this file to discover all available pages before exploring further.

# FEEL Data Types

<Info>
  **Heads Up!**

  This page provides information on the legacy FEEL Engine, that was used before the
  current [Scala-based FEEL Engine](/user-guide/dmn-engine/feel)
  was integrated into ASEE Flow.
</Info>

The ASEE Flow DMN engine supports the following FEEL data types.

## String

<img src="https://mintcdn.com/aseeflow/EOmYJq0E21aelwRy/reference/dmn/feel/img/string-type.png?fit=max&auto=format&n=EOmYJq0E21aelwRy&q=85&s=4775a581bd1dfba601222f20ab23c26b" alt="String" width="293" height="125" data-path="reference/dmn/feel/img/string-type.png" />

FEEL supports Strings. They must be encapsulated in double quotes. They
support only the equal [comparison] operator.

## Numeric Types

<img src="https://mintcdn.com/aseeflow/EOmYJq0E21aelwRy/reference/dmn/feel/img/integer-type.png?fit=max&auto=format&n=EOmYJq0E21aelwRy&q=85&s=63b382dd6cfc53c343ce5c599b762de4" alt="Integer" width="293" height="125" data-path="reference/dmn/feel/img/integer-type.png" />

FEEL supports numeric types like integer. In the ASEE Flow DMN engine the
following numeric types are available:

* integer
* long
* double

Numeric types support all [comparison] operators and [ranges].

## Boolean

<img src="https://mintcdn.com/aseeflow/EOmYJq0E21aelwRy/reference/dmn/feel/img/boolean-type.png?fit=max&auto=format&n=EOmYJq0E21aelwRy&q=85&s=ced739e389a85a7febf76ac3573d1cc7" alt="Boolean" width="293" height="125" data-path="reference/dmn/feel/img/boolean-type.png" />

FEEL supports the boolean value `true` and `false`. The boolean type only
supports the equal [comparison] operator.

## Date

<img src="https://mintcdn.com/aseeflow/EOmYJq0E21aelwRy/reference/dmn/feel/img/date-type.png?fit=max&auto=format&n=EOmYJq0E21aelwRy&q=85&s=fe00d6a07be79e23420ad3464c4fe4c8" alt="Date" width="292" height="125" data-path="reference/dmn/feel/img/date-type.png" />

FEEL supports date types. In the ASEE Flow DMN engine the following date types
are available:

* date and time

To create a date and time value, the function `date and time` has to be used
with a single String parameter. The parameter specifies the date and time in
the format `yyyy-MM-dd'T'HH:mm:ss`.

Date types support all [comparison] operators and [ranges].

[comparison]: /reference/dmn/feel/legacy/language-elements#comparison

[ranges]: /reference/dmn/feel/legacy/language-elements#range