Create auto alerts in ax 2009

Hi everybody ,

I would like to know is there any way to Send auto Alerts without any triggers to Multiple Users in AX 2009?

My task : I has developed weekly timesheet for my company.For this ,i need to send alert /mail every start of the week or end of the week to users to prepare and submit the weekly timesheet.For that i need to create auto alerts.

Can you please suggest me?