Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"_id":"123"},{"_id":"345"}]
Query
db.collection.update({_id:{$in:["123","345"]}},[{$set:{reportingDate:{$dateTrunc:{date:"$$NOW",unit:"day"}}}}],{multi:true})
Result