Photo mechanic version 5.0, build 13764. Platform: Windows 8 64 bit.
When saving a set of IPTC info into an XMP sidecar file for use with other images using the "Save..." command in the IPTC info window, photoshop:DateCreated is included in the saved file. This is annoying because when applying the set of information to another image using the "Load..." command, the next image's DateCreated metadata is overwritten. To workaround this problem I must manually edit the saved XMP sidecar file using a text editor, deleting the line containing the value photoshop:DateCreated.