What is the cron time if i want to schedule an alert which should trigger on each day at 9 AM
You can use a tool like this:
http://www.openjs.com/scripts/jslibrary/demos/crontab.php
To generate you cron jobs
Select "Choose" 0 minutes to start on the hour.
Select "Choose" 9am for the hour.
Then press "create cronetab line" and you get your result.
Good tool.
0 9 * * *