Clarity

The Customer would like to fill in a data attribute with the working date.  I have created the date attribute,but can't to constrain the end user to input the public holiday or Sunday. How to create a date attribute which only allowed to fill with the working date?

Create a process on the date that will set the date to a working day (Fri / Mon) if the date entered by the user is a holiday.

Also, make sure that you send a mail to the user stating the same

NJ

Nothing at "data-entry time" in the GUI - only thing you can do is process it afterwards somehow (like NJ is suggesting) which is far from ideal.

Perhaps, stick some hint text on the field saying "Enter a WORKING DATE"?

Or, in whatever logic uses that date "downstream", use the nearest working date to the entered date.

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No good answer for this at all though I'm afraid.

100% agree - "Perhaps, stick some hint text on the field saying "Enter a WORKING DATE"?" - this should do

NJ

You could create an attribute where you select the value from a list and create a lookup with a query which returns a rolling set of working days to dropdown list to select from.