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如何从mongodb的两个日期得到差异的总和

我想总结一下minuts中starttime和endtime的差异.

{
    "_id" : ObjectId("56cd544df7851e850d8b4573"),
    "user_id" : "281",
    "document_id" : "1455614372.pdf",
    "page_number" : "1",
    "starttime" : ISODate("48118-03-20T01:35:14Z"),
    "endtime" : ISODate("48118-03-20T04:29:10Z")
}
{
    "_id" : ObjectId("56cd544df7851e850d8b4574"),
    "user_id" : "281",
    "document_id" : "1455614372.pdf",
    "page_number" : "1",
    "starttime" : ISODate("48118-03-20T14:29:49Z"),
    "endtime" : ISODate("48118-06-22T12:52:36Z")
}
{
    "_id" : ObjectId("56cd544df7851e850d8b4575"),
    "user_id" : "281",
    "document_id" : "1455614372.pdf",
    "page_number" : "2",
    "starttime" : ISODate("48118-03-20T04:29:10Z"),
    "endtime" : ISODate("48118-03-20T14:29:49Z")
}
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我的收藏名称是pdftracker.

mongodb mongodb-query aggregation-framework

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1
解决办法
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