<p>i would like to release a snapshot project 'foo-1.0-SNAPSHOT' using the maven release plugin. The project depends on a 3rd party module 'bar-1.0-SNAPSHOT' which is not released yet.
I use the option 'allowTimestampedSnapshots' in my project's pom.xml to allow timestamped snapshots but i assume that the 3rd party module (bar) is not timestamped unless i build it myself as maven still complains about unresolved SNAPSHOT dependencies.</p>

<p>Is there a way to release the project foo regardless of dependent SNAPSHOT projects and if not how could i add a timestamp to the 3rd party project?</p>

The short answer is see the
following answer
.... the long answer is you can work around it.
The only way I have coped in the past is to effectively fork the 3rd party library and cut a release myself. This of course is easier said than done and is just plain difficult if the library is large and complex and impossible if the 3rd party library is closed source. An easier route maybe to approach the 3rd party and ask them to cut a release.
Another option may be to copy their pom (ensure that it has no snapshots) change the version information and manually install the pom and artifact in your repository.