Yes Prakash, You can use scheduler for calling automatic function.

You can find many example of scheduler under OpenERP core addons modules like sale, purchase, account etc.

See helpful links,

How to create Scheduler in OpenERP

Hello Ghanshyam Prajapati,

I Configured the below steps Send Auto Email 1 day before the date:-

1) Outgoing SMTP Mail Server configured [Connection test succeeded]

2) Automated Action configured for the custom module
Applied After Update filter, Trigger Date is egual to Date, Delay Trigger Date After -1 Minute and Server Action configured

3) Default Scheduled Action Email Queue Manager, Check Action Rules, Check Action Rules Activate Every 1 minutes.

But not received mail please let me know if i missed any configure

Thanks in advance