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long currentTime = System.currentTimeMilliscurrentSystemTimeMillis();

// If currentTime is before startTime, return the difference between startTime and currentTime
if (currentTime < startTime) {
	return startTime - currentTime;
}

// Calculate how many intervals have passed since startTime
long elapsedTime = currentTime - startTime;

// Calculate how many full intervals have passed
long intervalsPassed = elapsedTime / interval;

// Calculate the time of the next trigger time
long nextTriggerTime = startTime + (intervalsPassed + 1) * interval;

// If the current time is already a trigger time, return 0
return nextTriggerTime - currentTime;