Elapsed-Time

Used to get the elapsed time in string format from NSDate.

/*
 *  params      :   date (NSDate)
 *  returns     :   elapsed Value (NSString)
 */

- (NSString *)elapsedTimeSince:(NSDate *)date {
    NSTimeInterval timeInterval = [date timeIntervalSinceNow];
    NSAssert(timeInterval<0, @"Please provide past date for elapsed time");

    timeInterval = abs(timeInterval);

    double seconds = 60;
    double minutes = 60;
    double hours = 24;

    int noOfSeconds = fmod(timeInterval, seconds);
    int noOfMinutes = timeInterval/seconds;

    if (noOfMinutes == 0) {
        return [NSString stringWithFormat:@"%d seconds ago", (int)noOfSeconds];
    } else if (noOfMinutes > 0) {
        int noOfHours = noOfMinutes/minutes;
        if (noOfHours == 0) {
            return [NSString stringWithFormat:@"%d %@ ago", (int)noOfMinutes, (int)noOfMinutes == 1? @"Minute":@"Minutes"];
        } else {
            int noOfDays = noOfHours/hours;
            if (noOfDays == 0) {
                return [NSString stringWithFormat:@"%d %@ ago", (int)noOfHours, (int)noOfHours == 1? @"Hour":@"Hours"];
            } else {
                NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
                [dateFormatter setDateFormat:@"MMM d, y"];
                return [dateFormatter stringFromDate:date];
            }
        }
    }
    return @"";
}