Currently Being ModeratedFeb 7, 2014 5:09 PM (in response to Roseville Bob)
In Numbers 3.x you can place the current date in a footer cell by entering the formula =NOW(). It will always show the current date and can be formatted with your preferred date style.
Currently Being ModeratedFeb 7, 2014 5:10 PM (in response to Roseville Bob)
Insert > Date didn't make the cut for the Version 3 edition.
SG, a frequent poster here, has written a nice script that is a great substitute. Check back and I'm sure he will have visited and posted his solution.
Currently Being ModeratedFeb 7, 2014 5:34 PM (in response to Roseville Bob)
Further to Jerry's pointer, see this thread for a description of how you can set up an 'insert date' pick in your menu.
If you want (thanks to Badunit for showing that this was possible) instead of going through the steps described there you can just grab a copy of the service via this link (automatic download from Dropbox). When you doubleclick it, you'll be asked if you want to install it. You may have to go to System Preferences > Security & Privacy to click 'open anyway' if you get a warning message.
That's it. After it's installed it will be a menu pick similar to the screenshot above.
If you want to rename it, then in Finder hold down the option key choose Go in the menu, navigate to Library > Services and rename it there as you would any other file.
If you don't like going to the Services menu then assign a keyboard to it at System Preferences > Keyboard > Shortcuts.