Question

I don’t know if am am loosing my mind or if this is even possible.

By the way, I am not using any standard libraries so this is not language dependent, hence why it’s here and not on stackoverflow.

I have 2 time periods that are being passed to me in a int format.

1st period-
    Start Time:
    End Time:

2nd period-
    Start Time:
    End Time:

The Int’s are minutes since midnight, so 7am would be 420 minutes.

So an example of a function I am trying to write is:

bool SpanMoreThan24Hours(int firstStartTime, int firstEndTime,
                         int secondStartTime, int secondEndTime)
{
    ....
}

I am not even sure this can be done.

P.S. Spanning midnight is fine, but it doesn’t have to.
Periods can’t overlap.

So it could look like this:
420, 1140, 1260, 419
7am, 7pm,  9pm,  6:59am
- Valid
This would be valid since it doesn't span over 24 hours.

420, 1140, 1260, 421
7am, 7pm,  9pm,  7:01am
- Not valid

420, 60, 120, 419
7am, 1am,2am, 6:59am
- Valid

I have to make sure from 1st period start time till 2nd period end time is not over 24 hours.

Answer 1

If a period can start on monday and end on wednesday, there is no solution to the problem; otherwise, here is some C# to you:

int MinutesBetweenTwoTimes(int time1, int time2)
{
    return time1 < time2 ? time2 - time1 : (1440-time1) + time2;
}

bool SpanMoreThan24Hours(int firstStartTime, int firstEndTime,
                         int secondStartTime, int secondEndTime)
{
    int totalSpannedTime = MinutesBetweenTwoTimes(firstStartTime, firstEndTime)
                           + MinutesBetweenTwoTimes(firstEndTime, secondStartTime) 
                           + MinutesBetweenTwoTimes(secondStartTime, secondEndTime);
    return totalSpannedTime > 1440;
}