How to display date when picture was uploaded

[pgrzegorc]

I would like to display date of uploading file under picture

I know that I should use expression:
$info[$lang_picinfo['Date taken']]

but I still don't know how to make this operation (retrieve date of uploading picture) for approprate picture
What I should to assign to this expression: $info[$lang_picinfo['Date taken']] in order to have right date of uploading???