Command to modify the date on all the records of a MongoDB collection

mongo-add-year.sh

// Command:
// Change database for your db name and collection for your collection name
// Remove limit(1). Is there in order to avoid accidents ;)

mongo database --eval \"db.collection.find().limit(1).forEach(function(doc){ var nd = new Date(doc.created_at); nd.setDate(nd.getDate() + 1); doc.created_at = new ISODate(nd.toISOString()); db.collection.save(doc)});"

/* The function in a more readable fashion :)
function(doc) { 
  var nd = new Date(doc.created_at); 
  nd.setDate(nd.getDate() + 1);  
  
  doc.created_at = new ISODate(nd.toISOString()); 
  db.collection.save(doc)
}
*/