I also have a nutty one along these lines.
I have a site built in Revo with a large number of resources that where imported from Evo using the amazing Provisioner plugin.
This works from some articles:
[[+publishedon:strtotime:date=`%d/%m/%Y`]]
But for some reason older resources (I suspect those imported from Evo) the date comes out as 01/05/9540 or 01/05/0 even after opening the resources chaning the date and resaving.
However this seems to have the opposite effect:
[[+publishedon:strftime:date=`%d/%m/%Y`]]
The resources showing incorrect dates now show fine but others so up as 01/01/1970
Any ideas why?