Since all microwave ovens are not alike, and all have different operating features, it would be easier for me to instruct you on how to obtain an owner's manual rather than trying to explain it step by step.
If you model number is correct, your owner's manual, complete with operating instructions is listed at managemylife.com:
http://www.managemylife.com/mmh/owner_manuals/search?query=NN-T964SF
Your manual is listed in a .pdf (Adobe) format that you can download or print for FREE.
If you have any questions, please post back and let me know. I hope this helps you.
SOURCE: Set clock time on microwave oven
I have consulted the Owners Manual and there is no mention of the demo mode. I would suggest that you unplug the unit or disconnect power if it is hard wired in, and try to set the clock then.
I hope this information allows you to resolve this issue.
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If you need further assistance please comment to this post and I will try to help you further.
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