The DSC-T30 won't deface your pictures by scrawling a series of numbers across them. However, the date and time (and a lot more) are stored with every picture in what's called the EXIF data. Any photo viewing/cataloging program should be able to display this information.
Most photo printing programs will be able to print some or all of this information as well. Depending on the program and printer, you may be able to print this on the image, in the margins, or on the back. Please refer to the documentation for the program for instructions.
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