Our users asked for button which will open calendar remider window, this one wchich pop ups when you log in to Salesforce.

Solution is based on custom button which execute Javascript. This button is placed in Task and Event in our case.

1. Button configuration:

JavaScript Code:"/ui/core/activity/ActivityReminderPage?at={!FLOOR( 86400000 * ( NOW() - DATETIMEVALUE( DATE( 1970, 1, 1 ) ) ) )}","_blank","toolbar=no, location=yes, directories=no, status=no, scrollbars=yes, resizable=no, copyhistory=yes, width=600, height=300");

2. Go to page layout settings and add custom button.

Based on:
How does one re-activate the Reminder Window if it gets closed


© Paweł Woźniak