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  1. Core Server
  2. SERVER-9406

Allow treating ObjectId type as date in $project phase

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    • Backwards Compatibility:
      Fully Compatible

      Description

      Since ObjectId() encompasses an approximation of insertion date it would be helpful if _id/things of ObjectId() type could be operated/projected the same way as Datetime type object.

      {case}
      {$project:{$year:"$_id"}} would extract year out of ObjectId().getTimestamp equivalent.{case}

      One question would be whether ObjectId could be operated on directly via date/interval arithmetic. I.e. whether it can be used anywhere a date can be used returning a standard Datetime type as a result from say {$subtract:["$_id",86400000]} which can only return ts of one day before that ObjectId's timestamp.

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