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    <p>This question can be solved by altering your map reduce, unless I am mistaken.</p> <p>My assumption from the comments is that what you are looking for is a sum of each hour, for each previous hour. This means that you can mapreduce on the <code>CollectionDateHour</code> rather than the <code>CollectionDate</code>. You can then control in the application where you want the <code>CollectionDateHour</code> to fall (for example you can decide if <code>6:45</code> is in the <code>7:00</code> group or in the <code>6:00</code> group.</p> <p>There is two points to change in your application, first handle the collection date hour:</p> <pre><code>for (int l = 1; l &lt; records.Length; l++) { ... var collectionDate = Convert.ToDateTime(BsonString.Create(abc[5])); var collectionDateHour = collectionDate.Minute&gt;0?collectionDate.AddHours(1).Hour:collectionDate.Hour; book1.Add("CollectionDateHour", BsonInt32.Create(collectionDateHour)); ... </code></pre> <p>Which is simply making the <code>CollectionDateHour</code> one more than the hour from <code>CollectionDate</code> if there is any minute part of <code>CollectionDate</code>. You can tune this to fit your logic.</p> <p>The second change is to adjust your map reduce function so that you are reducing based on the <code>CollectionDateHour</code> rather than the full string you have used previously. One way to do this would be to change your map function:</p> <pre><code>String map = @"function() { var newCollectionDate = this.CollectionDate.split(' ')[0] + (this.CollectionDateHour&lt;10?' 0':' ')+this.CollectionDateHour + ':00' emit(newCollectionDate, {CollectionDate : newCollectionDate, count: 1}); }"; </code></pre> <p>Which will set the collection date to the hour figure worked out in your application logic and and reduce on that. Given the above two changes, the following input:</p> <pre><code>{ "CollectionDate" : "08-08-2012 05:00" } { "CollectionDate" : "08-08-2012 05:15" } { "CollectionDate" : "08-08-2012 05:10" } { "CollectionDate" : "08-08-2012 04:00" } { "CollectionDate" : "08-08-2012 12:45" } { "CollectionDate" : "08-08-2012 12:46" } { "CollectionDate" : "08-08-2012 23:45" } </code></pre> <p>Will give these results:</p> <pre><code>{ "_id" : "08-08-2012 00:00", "value" : { "CollectionDate" : "08-08-2012 00:00", "count" : 1 } } { "_id" : "08-08-2012 04:00", "value" : { "CollectionDate" : "08-08-2012 04:00", "count" : 1 } } { "_id" : "08-08-2012 05:00", "value" : { "CollectionDate" : "08-08-2012 05:00", "count" : 1 } } { "_id" : "08-08-2012 06:00", "value" : { "CollectionDate" : "08-08-2012 06:00", "count" : 2 } } { "_id" : "08-08-2012 13:00", "value" : { "CollectionDate" : "08-08-2012 13:00", "count" : 2 } } </code></pre>
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