Is there a way to create a date/time stamp that would show within my project window and could not be modified by the user?
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There are no blocks which generate a date/time stamp. It's a variable which the user could initialize by being prompted but then you're asking the user to enter something and that can go anywhere.
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Actually, there is one...
somewhere...
in 2.0
Under Sensing.
It shows the days since Scratch started, and different units of time. You can program it to show the date and time.
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