New answers tagged osmosis
In JOSM, select things you don't need and then purge(same as delete but it removes the records as well)
So you refer to the timestamp that a osm object had been touched (or created)? I would recommend to work offline and get an appropriate Planet extract. Sadly AFAIK there is no tool that works with OSM that way, as they use a slightly different method for replication (based on changesets and version numbering). So you need to do it manually: download .pbf ...
This seems to be an error with missing timestamp values in the OSM file. See http://wiki.openstreetmap.org/wiki/Talk:Osmosis#Producing_empty_timestamps . You need timestamps in the OSM XML, perhaps just fake them.
You are using an old version of Osmosis. Since Openstreetmap has hit the line of 2^64 node numbers, all software using the data had to change node number variables from integer to long integer. If not, the software will return the error message you got. Current versions of Osmosis have fixed this problem.
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