Use the standard interval overlap condition.

For two intervals to overlap, the first meeting must start before the second meeting ends, and the second meeting must start before the first meeting ends.

If either meeting ends before or exactly when the other begins, there is no overlap.

Pseudocode:

function meetingOverlapCheck(start1, end1, start2, end2):
    if start1 < end2 and start2 < end1:
        return true
    return false