# Issue

*This Content is from Stack Overflow. Question asked by Satoshi *

In brief, I have:

```
startTime (When my interval chain will start)
repeatEveryMinuteInterval (Repeat every minute of this action)
duration (Duration of the action)
```

It builds the chain of the intervals. Example 1:

```
StartTime - 15:00 UTC 9/19/2022
repeatEveryMinuteInterval - 15
duration - 5 minutes
15:00 - 15:05
15:15 - 15:20
15:30 - 15:35
15:45 - 15:50
16:00 - 16:05
// as it is endless it will iterate an infinite number of times
```

Example 2:

```
StartTime - 03:07 UTC 10/19/2022
repeatEveryMinuteInterval - 30
duration - 5 minutes
03:07- 03:12
03:37- 03:12
04:07- 04:12
// as it is endless it will iterate an infinite number of times
```

My question is: as these 2 interval chains do not have an end, how can I know that they wouldn’t overlap in the future?

I assume, that 2 intervals overlap if they share the same time even partially.

```
15:30 - 15:45
15:25 - 15:31
They are overlapping as they both have 15:30 - 15:31 in the intervals.
```

From the implementation point of view, I have figured out 3 ways, and all of them are dummy )

1.) Assume post that they will overlap as it is an endless set and impossible to calculate and have a consistent result.

2.) To calculate maybe the next 1000 of the iterations and compare. The thing is that I don’t know how many times should i iterate to have a valid result and for this operation not to take a lot of time to calculate.

UPD: If anyone has a solution with or without time zones, I will be glad to communicate. Thanks

I am reopening my question as a received update from the CryptoFool that this problem can be solved.

Closed question

How to know – will 2 repeatable intervals overlap in the future

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