Query Mongodb on month, day, year... of a datetime

Question

I'm using mongodb and I store datetime in my database in this way

for a date "17-11-2011 18:00" I store:

date = datetime.datetime(2011, 11, 17, 18, 0)
db.mydatabase.mycollection.insert({"date" : date})

I would like to do a request like that

month = 11
db.mydatabase.mycollection.find({"date.month" : month})

or

day = 17
db.mydatabase.mycollection.find({"date.day" : day})

anyone knows how to do this query?

Answer 1

Dates are stored in their timestamp format. If you want everything that belongs to a specific month, query for the start and the end of the month.

var start = new Date(2010, 11, 1);
var end = new Date(2010, 11, 30);

db.posts.find({created_on: {$gte: start, $lt: end}});
//taken from http://cookbook.mongodb.org/patterns/date_range/