> db.collection.find();
{ "_id" : ObjectId("55ffec992363a42957aebea8"), "Date" : "14-11-2014", "Value" : 25.36 }
{ "_id" : ObjectId("55ffeca02363a42957aebea9"), "Date" : "14-12-2014", "Value" : 25.36 }
{ "_id" : ObjectId("55ffeca72363a42957aebeaa"), "Date" : "14-01-2015", "Value" : 25.36 }
{ "_id" : ObjectId("55ffecac2363a42957aebeab"), "Date" : "14-02-2015", "Value" : 25.36 }
{ "_id" : ObjectId("55ffecb12363a42957aebeac"), "Date" : "14-03-2015", "Value" : 25.36 }
{ "_id" : ObjectId("55ffecb52363a42957aebead"), "Date" : "14-04-2015", "Value" : 25.36 }
{ "_id" : ObjectId("55ffecb92363a42957aebeae"), "Date" : "14-05-2015", "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 }

##</code><code>##

var cursor = db.collection.find()
while (cursor.hasNext()) {
 var doc = cursor.next();
 var docDate = doc.Date;
 var queryDate = "14-03-2015";
 var docDateMillis = new Date(docDate.substring(6,10), docDate.substring(3,5)-1, docDate.substring(0,2)).getTime();
 var queryDateMillis = new Date(queryDate.substring(6,10), queryDate.substring(3,5)-1, queryDate.substring(0,2)).getTime()
 if(docDateMillis < queryDateMillis) {
   db.collection.remove({_id : doc._id})
 }     
}