mongodb - Is Mongo aggregation with a date range broken? -

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i have collection of documents string field "action" , "receivedtimestamp" date field, values of march , april 2016. i'm trying count how many there of each action in date range.

when run this:

db.getcollection('foo').aggregate([   {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 68 results.

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$gte": new date("2016-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 68 results.

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$gte": new date("2017-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 68 results.

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$lte": new date("2017-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 0 results.

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$lte": new date("2016-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 0 results.

so i'm starting think mongo aggregation date range broken. wrong?

solved switching isodate:

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$gte": new isodate("2016-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 68 results.

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$gte": new isodate("2017-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 0 results.

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$lte": new isodate("2016-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 0 results.

when run this:

db.getcollection('foo').aggregate([   {"$match": {"receivedtimestamp": {"$lte": new isodate("2017-01-01")}}},    {"$group": {"_id":   "$action", "count": {"$sum": 1}}} ])

i 68 results.

this behavior expect see. i'm not aware of documentation of requirement use isodate in context.


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