I'am using the utilitiy program which came with my first digital camera a Nikon P5000 to change the filename completely into a date based. The filenames are built like: YYYYMMDD-NNNN-XXXX.jpg, where NNNN ist a counter set by the program and XXXX stands for a unique identifier for the camera like K10D for example.
Thus the files are named like this:
20190116-0001-K10D.jpg
20190116-0002-K10D.jpg
20190120-0001-K10D.jpg - Note, that the counter is reset with a new day by the importing program!
....
When taking two cameras at the same time I set their time before going into the field onto the second. I then expand the filename by the timestamp which looks like this when copied to the same folder:
20190116-102345-K10D.jpg
20190116-102350-K10D.jpg
20190116-102450-istD.jpg
20190116-102623-K10D.jpg
...
The advantage of this method is, the files are always sorted in the order they have been taken.
The disadvantage for the first method ist, I haven't found any other import interface, that adds the NNNN part by itself as the Nikon program does, i.e. reseting it for every day.
The second method does not need the NNNN part, as long as you do not shoot multiple pictures within one second. I guess to built a unique filename based on date and time should be able with the import interface of most of the programs made for handling digital photos.
A quick search for ACDSee i.e. showed that it is possible to rename the files even to Date/Time-originalfilenumber. IMatch for example is capable to rename files based on every exif-information.
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