Thanks @Anonymous ,
Firstly, before you do this, go into your app File > Settings >Advanced Settings >Experimental Features and turn on Formula-level Error Management. If you do not do this, the Date will not clear.
Now it will depend where you run this code from - the example below would be from a button inside a card on the form (you would have to unlock it) or inside a gallery.
You have not given me your SharePoint list name - I will use MySPList - change to your name. I have also assumed your field names are as per your post. I urge you change the field names Date and Name (reserved words) and take the full stop off proc.
UpdateIf(
MySPList,
ThisItem,
{
Date:Blank(),
Month:Blank(),
Code:Blank(),
Proc:Blank(),
Name:Blank()
}
)
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