Using roundMinutes in Java

Question

I am trying to get the hour and minute and then round the minutes to the nearest 5. I found the java Calendar class with the roundMinutes function here: enter link description here

How would I use this in code? I have tried creating a Calendar object, a Date object, but nothing shows me this method to use. Providing an example would be great!

Im not sure what API that is, but it isnt for the Standard Java Calendar class. Here is the Java 7 Documentation for Calendar. http://download.oracle.com/javase/7/docs/api/java/util/Calendar.html — Hunter McMillen, Aug 12 '11 at 13:01
While it doesn't directly answer your question, you'll probably want to use Joda Time whenever you're doing something with dates, not the built-in classes. http://joda-time.sourceforge.net/ — Bart van Heukelom, Aug 12 '11 at 13:03
I have previously answered a similar question where the OP wanted to round to the nearest quarter. Check it out here: http://stackoverflow.com/questions/3553964/how-to-round-time-to-the-nearest-quarter-in-java/3553994#3553994 — Sean Patrick Floyd, Aug 12 '11 at 13:10
@BartvanHeukelom FYI, the [*Joda-Time*](http://www.joda.org/joda-time/) project is now in [maintenance mode](https://en.wikipedia.org/wiki/Maintenance_mode), with the team advising migration to the [*java.time*](http://docs.oracle.com/javase/9/docs/api/java/time/package-summary.html) classes. See [Tutorial by Oracle](https://docs.oracle.com/javase/tutorial/datetime/TOC.html). — Basil Bourque, Mar 18 '18 at 20:57

score 2 · Answer 1 · answered Mar 11 '14 at 09:16

The following code rounds a given joda DateTime to 5 minutes and up

DateTime dt = timeEnded.minuteOfDay().roundCeilingCopy();

int minutes = dt.getMinuteOfHour();
int mod = minutes % 5;
int add = 5 - mod; //add this to our datetime

DateTime roundedTo5 = dt.plusMinutes(add);

score 2 · Accepted Answer · answered Aug 12 '11 at 13:06

Make sure you are using this Calendar. There is no roundMinutes in java's default calendar.

calendar.roundMinutes(5, Calendar.ROUND_UP) if you want 5:41 to become 5:45
calendar.roundMinutes(5, Calendar.ROUND_DOWN) if you want 5:41 to become 5:40

calendar.roundMinutes(5, Calendar.ROUND_AUTO) if you want 5:41 to become whatever the library thinks is normal.

See ROUND_DOWN

score 1 · Answer 3 · answered Aug 12 '11 at 13:05

1

Be sure you are using the right Calendar class: org.rakeshv.utils.Calendar, assuming you are using the custom Util jar that Rakesh created.

answered Aug 12 '11 at 13:05

Atreys

3,741
1
17
27

score 1 · Answer 4 · answered Aug 12 '11 at 13:07

1

I'm not sure about the nearest 5 minutes but the following code will round to the next minute:

Date now = new Date();
Date nearestMinute = DateUtils.round(now, Calendar.MINUTE);

Perhaps you can proceed form there :D

answered Aug 12 '11 at 13:07

gotomanners

7,808
1
24
39

Using roundMinutes in Java

4 Answers4

Linked