Apple Aperture 2 - Manual (Page 130)

130 Part I Interface and Acquisition
Creating Custom Name Formats
In addition to the preset name formats, you can create custom name formats. To create
a name format, you select the name elements you want in the Naming Presets dialog.
You can compose a name format that combines the following name elements:
 Version Name
 Master Filename
 Sequence Number (1 of 3, 2 of 3, 3 of 3, and so on)
 Image Year
 Image Month
 Image Day
 Image Date
 Image Time
 Index Number (1, 2, 3, and so on)
 Custom Name
 Counter (001, 002, 003, and so on)
 Current Date
 Current Time
 Current Year
 Current Month
 Current Day