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> db.collection.find();
{ "_id" : ObjectId("55ffec992363a42957aebea8"), "Date" : "14-11-2014",
+ "Value" : 25.36 }
...
{ "_id" : ObjectId("55ffecc02363a42957aebeaf"), "Date" : "14-06-2015",
+ "Value" : 25.36 }
{ "_id" : ObjectId("55ffecc42363a42957aebeb0"), "Date" : "14-07-2015",
+ "Value" : 25.36 }
{ "_id" : ObjectId("55ffecc82363a42957aebeb1"), "Date" : "14-08-2015",
+ "Value" : 25.36 }

var cursor = db.collection.find()
while (cursor.hasNext()) {
...
   db.collection.remove({_id : doc._id})
 }     
}