mongoDB: Show MinuteBucket in Time value as ending time for the interval

问题

I have created Mongo PlayGround

Currently dateHour field is dividing time by 15min interval.

For example - if

`"updatedAt": ISODate("2020-03-20T18:16:50.000Z")` 

it shows as :

 "dateHour": ISODate("2020-03-20T18:15:00Z"),

so First 15min bucket is represented as 18:00:000z (this covers minutes from 1 to 15)

second 15min bucket is represented as 18:15:000z (this covers minutes from 15 to 30) and so on....

Expected -

First 15min bucket should be displayed as 18:15:000z (this covers minutes from 1 to 15) second 15min bucket should be displayed as 18:30:000z (this covers minutes from 15 to 30) and so on....

Basically it should show ending time for that interval

回答1:

You're using $trunc which is this case converts the result of $divide into lower minuteBucket, you can use $ceil instead:

minuteBucket: {
    $ceil: {
        $divide: [ { $minute: "$updatedAt"  },  15.0  ]
    }
},

Mongo Playground

来源：https://stackoverflow.com/questions/61163597/mongodb-show-minutebucket-in-time-value-as-ending-time-for-the-interval