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Rasmita Sahoo 11Rasmita Sahoo 11 

date field only the last friday of the month

Create one date field for validation. This field only receive the last friday of every month. Please help me out.
VinayVinay (Salesforce Developers) 
Hi Rasmita,

Can you try below validation rule.
  
IF(OR(DAY(Date_field__c) =28, DAY(Date_field__c) =29, DAY(Date_field__c) =30, DAY(Date_field__c) =31),true, false)

Please mark as Best Answer if above information was helpful.

Thanks,