MongoDB - Querying between a time range of hours

Question

I have a MongoDB datastore set up with location data stored like this:

{
\"_id\" : ObjectId(\"51d3e161ce87bb000792dc8d\"),
\"datetime_recorded\" : ISODate(\"         


        

Answer 1

Well, the best way to solve this is to store the minutes separately as well. But you can get around this with the aggregation framework, although that is not going to be very fast:

db.so.aggregate( [ 
    { $project: {
        loc: 1,
        vid: 1,
        datetime_recorded: 1, 
        minutes: { $add: [
            { $multiply: [ { $hour: '$datetime_recorded' }, 60 ] }, 
            { $minute: '$datetime_recorded' } 
        ] } 
    } },
    { $match: { 'minutes' : { $gte : 12 * 60, $lt : 16 * 60 } } }
] );

In the first step $project, we calculate the minutes from hour * 60 + min which we then match against in the second step: $match.