MongoDB aggregate Timezone for date add - mongodb

Question

I have a problem of MongoDB's aggregate of timezone is UTC. I have looked for solutions from many other existing issues, but it is still not working. My code as follows:
MongoDB version : 2.2
Data
{ "_id" : ObjectId("52a3c9df46c6a9627eeb0337"), "Counting" : { "id" : "b1a93dfda46c47848f9862031300d24c", "group" : "Salary", "user_id" : "4d4ad2d37a464ad09d9aca2fee4c760c", "subGroup" : "e–ae3?", "bank_id" : "97e0fecc322b49b48c4eb3c8425fea77", "fee" : 646, "isIncome" : "true", "payment" : "", "consumeDate" : ISODate("2013-08-15T16:00:00Z"), "createDate" : ISODate("2013-12-08T01:22:39.008Z"), "bank_name" : "9edb6897-cdb8-4ce4-8f08-f5792cfa83d9" } }
{ "_id" : ObjectId("52a3c9df46c6a9627eeb0338"), "Counting" : { "id" : "33b341fc71314daebe851397c5cbaa40", "group" : "Salary", "user_id" : "cb9e06649cf943e5b368f6b05fc126c6", "subGroup" : "e–ae3?", "bank_id" : "e8da8cdae3ae495ca76f873fb3460b6d", "fee" : 647, "isIncome" : "true", "payment" : "", "consumeDate" : ISODate("2013-02-28T16:00:00Z"), "createDate" : ISODate("2013-12-08T01:22:39.016Z"), "bank_name" : "6913b48a-1a95-48c5-81f5-6920031358d7"} }
{ "_id" : ObjectId("52a3c9df46c6a9627eeb033a"), "Counting" : { "id" : "f0d41ed9f29f47e7b68a05c378cf939d", "group" : "Salary", "user_id" : "847cadbf55f84615af3ee63922446b54", "subGroup" : "e–ae3?", "bank_id" : "f45d62b5e62f4b7fa8172870cd992f19", "fee" : 623, "isIncome" : "true", "payment" : "", "consumeDate" : ISODate("2013-04-18T16:00:00Z"), "createDate" : ISODate("2013-12-08T01:22:39.152Z"), "bank_name" : "30dd169e-723e-4748-93cd-2d7a45b4a3b7"} }
db.Product.aggregate([{
"$group": {
"_id": {
"tyear": {
"$year": [{
"$add": ["$Counting.consumeDate", 28800000]
}]
},
"tMonth": {
"$month": [{
"$add": ["$Counting.consumeDate", 28800000]
}]
},
"tDate": {
"$dayOfMonth": [{
"$add": ["$Counting.consumeDate", 28800000]
}]
},
},
"count": {
"$sum": "$Counting.fee"
}
} }])
Error Message :
"errmsg" : "exception: $add does not support dates"
Reference
How to agregate by year-month-day on a different timezone

Answer 1

I'd recommend doing this in two-steps as a project then a group.
var millisecondsFromUTC = 8 * 60 * 60 * 1000; //PST is -8 hours from UTC
db.Product.aggregate([
{ $project : {
consumeDateLocal: {
$subtract : [ "$Counting.consumeDate", millisecondsFromUTC ]
},
fee: '$Counting.fee" } },
{ $group: {
_id: {
"tyear": { $year: "$consumeDateLocal" },
"tMonth": { "$month": "$consumeDateLocal" },
"tDate": { "$dayOfMonth": "consumeDateLocal" }
},
count: {
$sum: "$fee"
}
} } ], ...);

Answer 2

I do it like this.
millisecondsFromUTC = 8 * 3600 * 1000
Db.collection.aggreagte([
{$match: query},
{
$group: {
_id: {
$dateToString: {
format: "%Y-%m-%d",
date: {$add: ["$date", millisecondsFromUTC]}
},
click: {$sum: '$click'},
money: {$sum: {$divide: ['$money', 10000]}},
pv: {$sum: '$pv'},
req: {$sum: '$req'},
date: {$last: '$date'}
}
}]