Which date should be used in a "changed:" attribute in a RIPE Database object?

The date in the "changed:" attribute should be the date you submit the object to the RIPE Database. Make sure your new object has at least one "changed:" attribute. If you edit an existing object, it is recommended you do not delete previous "changed:" attributes. Add a new "changed:" attribute at the end of the existing ones so the history of the object remains visible.