Thanks Necdet.
i followed the steps in the link and did as it stated successfully, but upon creating a new customer record and inserting the birthday field i get the error below promptly;
SCRIPT ERROR
"One of the script for this record has caused an error. ReferenceError: 'Setbirthday' is undefined at eval code. (evalcode:1:1)"
And this is the downloaded error log file below;
ReferenceError: 'SetBirthday' is undefined
at eval code (eval code:1:1)
at RunHandlerInternal (crm:5555/.../ClientApiWrapper.aspx
at RunHandlers (crm:5555/.../ClientApiWrapper.aspx
at ExecuteHandler (crm:5555/.../ClientApiWrapper.aspx
at Mscrm.TurboForm.Control.CustomScriptsManager.prototype.$BQ_1 (crm:5555/.../formcontrols.js
at Mscrm.TurboForm.Control.CustomScriptsManager.prototype.executeHandler (crm:5555/.../formcontrols.js
at Mscrm.TurboForm.Control.CustomScriptsManager.prototype.executeHandlerByDescriptor (crm:5555/.../formcontrols.js
at Anonymous function (crm:5555/.../formcontrols.js
at Anonymous function (crm:5555/.../global.ashx
at Mscrm.TurboForm.Control.Data.DataAttributeBase.prototype.fireOnChange (crm:5555/.../formcontrols.js