[SPAM] date_modified vs date_changed in nautilus

[Alexander Shopov <ash contact bg>]

Does anyone have the slightest idea what is the difference between 
date_modified and date_changed in the following string?

#: ../libnautilus-private/apps_nautilus_preferences.schemas.in.h:1
msgid ""
"A list of captions below an icon in the icon view and the desktop. "
"The actual number of captions shown depends on the zoom level. "
"Possible values are: \"size\", \"type\", \"date_modified\", "
"\"date_changed\", \"date_accessed\", \"owner\", \"group\", "
"\"permissions\", \"octal_permissions\" and \"mime_type\"."

al_shopov