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Interesting  to see struggles with Netsuite dates today. I am one step behind <@U373C5U11> today. I have been struggling with what should be another simple(r?) task. Take the invoice date, add 365 days, and assign that to a different, custom field....
`
		var invoiceDate = new Date(invoiceRecord.getValue({ fieldId:'trandate'}));
		var futureDate = new Date(invoiceDate.toString());		
		futureDate.setDate(futureDate.getDate() + 365);
`
That said, when I run the above code in the NS debugger, once "futureDate.setDate()" is run, I see the value of both "futureDate" *AND* "invoiceDate" increment by 365 days. 
Bonkers. Why is the value of "invoiceDate" changing in the debugger? I would have thought the "new Date(invoiceDate.toString()) would have effectively decoupled any sort of "variable referencing" going on.