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kavya kavikavya kavi 

send an email alert on giving an apppintment trough process builder

Hi , 

I have a situation where I need to send a mail to the customer one day before a given appointment date. The appointments can be made once, twice or many times. So each time when the record changes with a specific change in the appointment date. I need to trigger an email one day before the appointment date.
Am using a professional edition and have an option of using process builder. But I cannot use IsChanged() function in the criteria section of the process builder to send the scheduled actions. Is there any other way I could achileve this. Also there are no workflows. 

How can I automate the email alert in the above said scenario. Please help.