mapreduce - Emit a DateTime in the Map function of MongoDb -

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my map function looks this:

map = function() {    day = date.utc(this.timestamp.getfullyear(), this.timestamp.getmonth(), this.timestamp.getdate());    emit({day : day, store_id : this.store_id}, {count : 1}); }

timestamp stored date in database, this:

{ "timestamp" : "mon mar 01 2010 11:58:09 gmt+0000 (bst)", ...}

i need "day" in result collection stored date type well, it's stored long (epoch ticks) this:

{ "_id" : { "day" : 1265414400000, "store_id" : 10}, "value" : { "count" : 7 } }

i tried changing emit didn't help:

emit({day : {"$date" : day},...)

any ideas how that?

date.utc going return miliseconds epoch. when put data db, can use example: 

 new date(dateaslong)

and stored bson date format.

earlier mongo 1.7 show in hash as:

 "mon mar 01 2010 11:58:09 gmt+0000 (bst)"

1.7+ appear as: 

 isodate("2010-03-01t11:58:09z")

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