function readOnly(count){ }
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I hope you cannot create in standard way . You need an additional formula field and fill that with that information.
Let me know if you face any issues.
If this solution helps, Please mark it as best answer.
Thanks,
Try this!
Use Validation,
NOT(REGEX(LEFT( DateField ,7) , "(0[1-9]|1[012])[/](0[1-9]|[12][0-9]|3[01])"))
Try this!
If this solution helps, Please mark it as best answer.
Thanks&Regards,
Syed Jabeena