I have created a custom date/time field "Date_Created" and I am trying to write a workflow that autopopulates with zoho.currenttime.  its not working.  I created a workflow to be triggered when a lead is created and custom function SetDateCreated()

leadIdStr = input.leadId.toString();
mp = map();
mp.put("Date_Created",zoho.currenttime);
update =  zoho.crm.updateRecord("Leads", leadIdStr, mp);
info update;

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but when I try and save/execute it says "failed to save function variable 'leadId' is not defined"