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Variables can be defined within a GSP using the link:{gspTagsRef}set.html[set] tag:

[source,xml]
----
<g:set var="now" value="${new Date()}" />
----

Here we assign a variable called `now` to the result of a GSP expression (which simply constructs a new `java.util.Date` instance). You can also use the body of the `<g:set>` tag to define a variable:

[source,xml]
----
<g:set var="myHTML">
   Some re-usable code on: ${new Date()}
</g:set>
----

The assigned value can also be a bean from the applicationContext:

[source,xml]
----
<g:set var="bookService" bean="bookService" />
----

Variables can also be placed in one of the following scopes:

* `page` - Scoped to the current page (default)
* `request` - Scoped to the current request
* `flash` - Placed within link:{controllersRef}flash.html[flash] scope and hence available for the next request
* `session` - Scoped for the user session
* `application` - Application-wide scope.

To specify the scope, use the `scope` attribute:

[source,xml]
----
<g:set var="now" value="${new Date()}" scope="request" />
----
