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Cron Jobs are used for scheduling tasks to run on the server. They're most commonly used for automating system maintenance or administration. However, they are also relevant to web application development. There are many situations when a web application may need certain tasks to run periodically.
You can use Cloud Scheduler to set up scheduled units of work, known as cron jobs, that are sent to targets on some recurring schedule, also called the job interval or frequency. Only a single instance of a job should be run at any time.
Cron is a time-based job scheduler in Unix or Unix-like computer operating systems. You can use Cron to schedule jobs, i.e. to execute commands or shell scripts at specified times, dates, or intervals.
Google has officially enabled cron in the AppEngine, for more details check:
Cron for Python: http://code.google.com/appengine/docs/python/config/cron.html
Cron for Java: http://code.google.com/appengine/docs/java/config/cron.html
This page lists how to achieve Cron-like functionality on Google Appengine.
You can now run scheduled tasks with google appengine
http://code.google.com/appengine/docs/python/config/cron.html#Securing_URLs_for_Cron
Read comments to issue 6 for possible workarounds.
Use http://schedulerservice.appspot.com/ or http://code.google.com/p/gaeutilities/wiki/Cron
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