Exif timestamps have a format of "YYYY:MM:DD HH:MM:SS", possibly with a timezone at the end.
Is there a general convention for how to handle these timestamps when the known precision is less than to the second?
For instance, for scans of my parent's wedding photos the timestamps should be only "YYYY:MM:DD" without any time of day (since I've no idea what time it was), but that format isn't allowed.
I have a vacation photo that I know was taken in August 1963, but again, "1963:08" isn't considered valid.
I can't be the only one that has scanned old photos and run into this inability to specify precision.
There are obviously many ways around it, such as using one of the description fields and ignoring the date tag, or putting the date in the filename, or … .
I'm wondering if people that frequently work with scanned photos have come up with a standard convention for handling the problem.