CODEWITHSUNDEEP
java
irengba
irengba

Reputation: 39

Split time into equal intervals in Java

Have a start time and end time that has to be split into equal interval.

E.g.

Start Time: 10AM, End Time: 14PM, Split Time: 30 minutes

The output has to be something like this -

::::Output :::

[{time:"10:00"},{time:"10:30"},{time:"11:00"},{time:"11:30"},{time:"12:00"},{time:"12:30"},{time:"13:00"},{time:"13:30"},{time:"14:00"}]

Thanks everyone in advance.

Upvotes: 0

Views: 5455

Answers (1)

Arnaud Denoyelle
Arnaud Denoyelle

Reputation: 31225

First, convert hours to minutes. 

10AM = 10 * 60 minutes
2PM or 14h = 14 * 60 minutes

Then, in order to convert minutes back to hours : 

minutes / 60 gives the number of hours
minutes % 60 gives the number of the minutes in the last hour.

If you want to display hours/minutes always on 2 digits, and eventually pad with a leading zero, use : 

String result = String.format("%02d", minutes/60);

(2 indicates that you want 2 digits and 0 indicates that you pad with zeros)

That said, there are 2 ways of going from 10*60 to 14*60 with steps of 30 minutes :

The most intuitive : the while loop

public static void interval(int begin, int end, int interval) {
  int time = begin;
  while (time <= end) {
    System.out.println(String.format("%02d:%02d", time / 60, time % 60));
    time += interval;
  }
}

But I don't like while loops. If you do it wrong (or if the input data are wrong), it ends in infinite loops.

The other way : as you know the begin, the end and the step, use a for loop : 

public static void interval2(int begin, int end, int interval) {
  for (int time = begin; time <= end; time += interval) {
    System.out.println(String.format("%02d:%02d", time / 60, time % 60));
  }
}

Test : 

interval2(10 * 60, 14 * 60, 30);

Result : 

10:00
10:30
11:00
11:30
12:00
12:30
13:00
13:30
14:00

Upvotes: 4

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