gistfile1.m

- (NSString *)niceTimeFormat:(NSTimeInterval)interval {
    // set a past flag if the timeInterval is negative and inverse it
    BOOL past = NO;
    if (interval < 0) {
        past = YES;
        interval = -interval;
    }
    
    // set some time units
    double second = 1, minute, hour, day, week;
    minute = second * 60;
    hour = minute * 60;
    day = hour * 24;
    week = day * 7;
    
    // generate a string from there
    if (interval < second * 7)
        return @"right now";
    if (interval < minute)
        return past ? [NSString stringWithFormat:@"%.0f seconds ago", floor(interval/second)] : [NSString stringWithFormat:@"In %.0f seconds", floor(interval/second)];
    if (interval < minute * 2)
        return past ? @"About a minute ago" : @"In about a minute";
    if (interval < hour)
        return past ? [NSString stringWithFormat:@"%.0f minutes ago", floor(interval/minute)] : [NSString stringWithFormat:@"In %.0f minutes", floor(interval/minute)];
    if (interval < hour * 2)
        return past ? @"About an hour ago" : @"In about an hour";
    if (interval < day)
        return past ? [NSString stringWithFormat:@"%.0f hours ago", floor(interval/hour)] : [NSString stringWithFormat:@"In %.0f hours", floor(interval/hour)];
    if (interval >= day && interval < day * 2)
        return past ? @"Yesterday" : @"Tomorrow";
    if (interval < day  * 365)
        return past ? [NSString stringWithFormat:@"%.0f days ago", floor(interval/day)] : [NSString stringWithFormat:@"In %.0f days", floor(interval/day)];
    else 
        return past ? @"Over a year ago" : @"In a year or more";
}