Canon POWERSHOT A720 IS User Manual page 145

The Date and File No. settings change according to the Print
Type as follows.
- Index
[Date] and [File No.] cannot be set to [On] at the same
time.
- Standard or Both
[Date] and [File No.] can be set to [On] at the same time,
however, the printable information may vary between
printers.
Images dated using
(p. 71) are always printed with the date, regardless of the
[Date] setting. As a result, some printers may print the date
twice on these images if [Date] is also set to [On].
Dates print in the style specified in the [Date/Time] menu
(p. 12).
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Print Settings/Transfer Settings
(Postcard Date Imprint mode)
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