DateTimeOriginal may differ from the DateTimeDigitized. Therefore, I checked XnViewMP's behaviour with respect to "old" and "uncertain" date stamps. ExifToolGUI does not accept blank characters in uncertain date stamps, therefore I inserted '00' instead, in conformity with the IPTC spec.
Exif-DateTimeOriginal can be formatted in XnViewMP's labels using the DateTaken tag. I tried several date stamps. My findings with WinXP are summarized in the following table.
This table summarizes some problems of XnViewMP to show DateTaken:
- an empty DateTimeOriginal tag is treated as an "error" (line 2).
- all date stamps before 1970-01-01 (the beginning of the epoque) are treated as an "error", regardless whether the date stamps are precise or "uncertain": the error condition (a procedure may return -1) is interpreted as a valid date (0xffffffff) and shown in DateTaken as 2106-02-07, which is the end of the unsigned 32bit-epoque.
- precise date stamps until 2106-02-07 are shown correct; the date 2038-01-20 (the day after the end of the signed 32bit-epoque) seems to be no problem.
- "uncertain" date stamps (indicated by '00') after 1970-01-01 will be "rounded down" (not a good idea...).
- the day after the end of the unsigned 32bit-epoque (2106-02-08) starts over with 1970-01-01.
XnView 1.97.x doesn't have any problems to show DateTaken. My suggestion is to go back to the previous implementation in v1.97.x.
