As Tommaso said, adding a field to the schema.xml gives you an automatic 
timestamp set at index time.  The default schema.xml with Solr 3.5.0 has a 
commented example:

        <field name="timestamp" type="date" indexed="true" stored="true" 
default="NOW" multiValued="false"/>

--
Hector

On Jan 20, 2012, at 8:15 AM, Tommaso Teofili wrote:

> Hi Alex,
> you can create a field in the schema.xml of type date or tdate called
> (something like) idx_timestamp and set its default option to NOW then you
> won't have to add any extra fields to the documents because it will be
> automatically created when documents are indexed.
> Hope it helps.
> Tommaso
> 
> 2012/1/20 ola nowak <ola.m.no...@gmail.com>
> 
>> Hi,
>> I want to be able to tell when the document was indexed, so I could
>> re-index it if it has changed in the meantime. Is there an easy way to do
>> this? Or I have to manualy put the date in the document and add a new field
>> in schema?
>> Thanks,
>> Alex
>> 

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