hi,

can you explain which dates are used by zenphoto ?
sometimes, I can see "Digital Creation Date" & "Digital Creation Time" of the picture (IPTC data), and sometimes, I can see the "Latest Modified Time" of the file on server.
And, as far I can see, the "Latest Modified Time" EXIF data is not used.

How can I refresh picture dates with (with priority order) IPTC data, EXIF data, and if the first dates are not present, date of files.

Maybe I am wrong but I think this is EXIF date taken (or was it Date and Time taken?) by default. This is the only date-time related data that has any sense in pictures.

I don't think it should be changed when e.g uploading edited pictures and overwriting existing ones.

If date taken is not available then some other data is used as date/time

The priority for setting the image date from image metadata is:

1. IPTCDateCreated
2. EXIFDateTime
3. EXIFDateTimeOriginal
4. EXIFDateTimeDigitized

If none of these are present the file mtime will be used.