MediaWiki:Multimediaviewer-datetime-created/qqq

Used in JavaScript code. Parameters: See also:
 * $1 - time and date

Note that the date comes from the description page and can have various forms (e.g. "2000-01-01", "1st January 2000", "1492", "16th century"...)

Also, this might refer to the date when the picture was taken, or the date when the depcited work was made - the usage is not consistent. You should choose a translation that works in all cases.