Add docs for auto timestamp disable functionality

docs/src/docs/asciidoc/advancedGORMFeatures/eventsAutoTimestamping.adoc

@@ -353,3 +353,33 @@ class Person {
 ----
 
 WARNING: If you have `nullable: false` constraints on either `dateCreated` or `lastUpdated`, your domain instances will fail validation - probably not what you want. Omit constraints from these properties unless you disable automatic timestamping.
+
+It is also possible to disable the automatic timestamping temporarily. This is most typically done in the case of a test where you need to define values for the `dateCreated` or `lastUpdated` in the past. It may also be useful for importing old data from other systems where you would like to keep the current values of the timestamps.
+
+Timestamps can be temporarily disabled for all domains, a specified list of domains, or a single domain. To get started, you need to get a reference to the `AutoTimestampEventListener`. If you already have access to the datastore, you can execute the `getAutoTimestampEventListener` method. You can also inject the bean that corresponds to your GORM implementation: `timestampInterceptor` for Hibernate, `mongoTimestampInterceptor` for MongoDB.
+
+Once you have a reference to the event listener, you can execute `withoutDateCreated`, `withoutLastUpdated`, or `withoutTimestamps`. The `withoutTimestamps` method will temporarily disable both `dateCreated` and `lastUpdated`.
+
+Example:
+
+[source,groovy]
+----
+//Only the dateCreated property handling will be disabled for only the Foo domain
+autoTimestampEventListener.withoutDateCreated(Foo) {
+ new Foo(dateCreated: new Date() - 1).save(flush: true)
+}
+
+//Only the lastUpdated property handling will be disabled for only the Foo and Bar domains
+autoTimestampEventListener.withoutLastUpdated(Foo, Bar) {
+ new Foo(lastUpdated: new Date() - 1, bar: new Bar(lastUpdated: new Date() + 1)).save(flush: true)
+}
+
+//All timestamp property handling will be disabled for all domains
+autoTimestampEventListener.withoutTimestamps {
+ new Foo(dateCreated: new Date() - 2, lastUpdated: new Date() - 1).save(flush: true)
+ new Bar(dateCreated: new Date() - 2, lastUpdated: new Date() - 1).save(flush: true)
+ new FooBar(dateCreated: new Date() - 2, lastUpdated: new Date() - 1).save(flush: true)
+}
+----
+
+WARNING: Because the timestamp handling is only disabled for the duration of the closure, you must flush the session during the closure execution!