Canon PowerShot S5 IS User Manual page 140

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.
Dates print in the style specified in the [Date/Time] menu
(p. 33, Basic Guide p. 8).
Do not set the date in the DPOF print settings when printing
images that have had the date embedded with the [Date
Stamp] function. This may cause the date to be printed
twice.
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