Depending on the file format, you can insert metadata tags if they’re not there. I took your list of formats from the previous post and looked them up in the exiftool documentation:
- bmp: No appropriate tag in their limited metadata
- png: exiftool can write a EXIF:DateTimeOriginal to it
- tiff: exiftool can write a EXIF:DateTimeOriginal to it
- pdn: No such format in the exiftool list
- pfi: No such format in the exiftool list. There are some pf* extensions, associated with fonts… ??
- mix: No such format in the exiftool list
- rtg: No such format in the exiftool list.
Given the mixed results above, I’d recommend putting the creation date-time in the filename. A lot of people do this; exiftool has a whole section in their documentation on how to do this:
https://exiftool.org/exiftool_pod.html#RENAMING-EXAMPLES
I know the command line can be a bit scary, but if you make a test directory of a few images and try some of the examples in it first, you can gain confidence in meeting your specific need as well as formulate the particular command you need.
Hope this helps…