c = db.c;
c.drop();

c.save( {} );
// Seems to work, using syntax similar to that in testall.js.                                   
printjson( c.aggregate( { $project : { date: { $isoDate:[{ year:1 }] } } } ) );
// Seems to not work because the year value is not 1 or 0.                              
printjson( c.aggregate( { $project : { date: { $isoDate:[{ year:2 }] } } } ) );
// Seems to not work using syntax from documentation page.                                   
printjson( c.aggregate( { $project : { date: { $isoDate:{ '$year':2 } } } } ) );
printjson( c.aggregate( { $project : { date: { $isoDate:[{ '$year':2 }] } } } ) );