How to round DateTime of Joda library to the nearest X minutes?

Question

How to round DateTime of Joda library to the nearest X minutes ?
For example:

X = 10 minutes
Jun 27, 11:32 -> Jun 27, 11         


        

Answer 1

Here's another approach that uses arithmetic on Unix time for completeness:

(Implemented in Scala for clarity.)

import org.joda.time.{DateTime, Duration}

def roundDateTime(t: DateTime, d: Duration) = {
  t minus (t.getMillis - (t.getMillis.toDouble / d.getMillis).round * d.getMillis)
}

Example usage:

roundDateTime(new DateTime("2013-06-27T11:32:00"), Duration.standardMinutes(10))
// => 2013-06-27T11:30:00.000+02:00

roundDateTime(new DateTime("2013-06-27T11:37:00"), Duration.standardMinutes(10))
// => 2013-06-27T11:40:00.000+02:00