mysql - How to group by only date, no datetime on mongodb -


well, want fetching results grouped date(year, month , day), no datetime(h:i:s).

in mysql can write:

select count(1), date(created) views  owner = 1 group date(created);

and mongo? well, have idea, dont work... dont know how set "date(created)"...

db.views.group({     "key": {         "created": true     },     "initial": {         "sum_id": 0     },     "reduce": function(obj, prev) {         prev.sum_id = prev.sum_id + 1;     },     "cond": {         "owner": 1     } });

please, if know how query grouped date, tell me, need... thanks


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