How do I check if current time and a custom time are within device time slot (wall clock time) of 30 mins

Question

I have a unique issue where I have to determine 2 things.

1) if my current time and a custom time are within the same 30 min time slot ( say its 2:10pm and the custom time is 2:22pm , I want to see they are within the same time slot from 2 to 2:30 ) but shouldn't be in the same time slot if current time is 1:55pm and custom time is 2:15pm (30 min difference but not within the same device/clock time slot as one is 1:30 to 2pm and another is 2 to 2:30pm)

2) Now, within the same time slot of 30 mins, if current time is before the custom time, I want to return a true, else return a false. any way to calculate this? I am looking to add a custom function in my common utils class where I can feed it custom time and current time and see the result, so would be useful to have something generic. Any ideas?

I have looked at : Check if a given time lies between two times regardless of date and other articles but nothing describes the 30 min device/clock time slot period.

Any idea if https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/time/DateUtils.html will somehow help me manipulate this exact logic or any custom function/library in android helps with this. will be really helpful!

Answer 1

package Demo;

import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.Arrays;
public class Test1 {
    public static void main(String arg[]) {
        LocalDateTime ct = LocalDateTime.now();
        LocalDateTime custemTime = ct.plusMinutes(5);
        System.out.println(ct);
        System.out.println(custemTime)  ;
        System.out.println(isInSameSlots(ct,custemTime));

    }   
    static boolean   isInSameSlots(LocalDateTime ldt1, LocalDateTime ltd2) {
        Long timeDiff = ChronoUnit.MINUTES.between(ldt1, ltd2);
        if(timeDiff > 30 || timeDiff < 0) 
           return false;
        return (ldt1.getMinute() <= 30 && ltd2.getMinute() <= 30) || (ldt1.getMinute() > 30 && ltd2.getMinute() > 30 ) ? true : false; 

    }

}

case 1

2019-06-10T18:40:09.122

2019-06-10T18:45:09.122

true

Case 2 ) 2019-06-10T18:46:56.350 2019-06-10T19:06:56.350 false