Canon A540
The date will only show up on the picture under a limited set of circumstances on the Canon PowerShot digital cameras, of which the A540 is one. You've probably found the Date function in the menu, but discovered that it was off, grayed out, and skipped over whenever you tried to reset it.
Date stamp will only work in "Postcard" mode. Press the Function button (labeled "FUNC SET"), then press the down button until you reach the Recording Pixels selection (usually labeled "L", but not always). It's probably the bottom onscreen selection. Use the right or left buttons to select Postcard, then press the Function button again.
Press the Menu button and scroll down to Date Stamp. Now you should be able to select "Date" or "Date & Time" with the right or left button. Press Menu again and take your pictures.
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