Database
[{_id:249776348,StartGameTime:1615789789,team:0,winner:0}]
Query
db.collection.aggregate([{$group:{_id:{$dateToString:{format:"%Y-%m-%d",date:{$add:[ISODate("1970-01-01T00:00:00Z"),{$multiply:[1000,"$StartGameTime"]}]}}},won:{$sum:{"$cond":{"if":{$eq:["$team","$winner"]},"then":1,"else":0}}},lost:{$sum:{"$cond":{"if":{$ne:["$team","$winner"]},"then":1,"else":0}}}}}])