How can I change the dates on many photos with a fix time of say 20s?

Question

Before it was possible to change the date on many pictures scanned by adddind a fix increlental of time.
How can I now change the dates on many pictures taht I have renumbered to keep the same incremental?

Answer 1

The seconds:
I just remembered - the time increment is set in Apple Script in seconds -  the variable  "minutes" is just a name for the value "60" and "hours" for "3600". Since "seconds" would have the value "1", there is no predefined constant "seconds".
If you want an increment of 30 seconds, simply write
set timeIncrement to 30
For example
on run {input, parameters}
  (* copyright leonieDF *)
          set timeIncrement to (1 * hours) + (2 * minutes) + 30
  (* select at least 2 images in Aperture *)
          tell application "Aperture"
  activate
                    set imageSel to (get selection)
                    if imageSel is {} then
                              error "Please select an image."
                    else
                              tell (item 1 of imageSel)
                                        set imageDate to value of EXIF tag "ImageDate"
  --set imageDate to get the value of EXIF tag "ImageDate"
                              end tell
                              repeat with i from 2 to count of imageSel
                                        set imageDate to imageDate + timeIncrement
  adjust image date imageDate of images {item i of imageSel}
                              end repeat
                    end if
                    return imageSel
          end tell
end run