User friendly timestamps. https://coderwall.com/p/52edja

gistfile1.txt

-(NSString*)dailyLanguage:(NSTimeInterval) overdueTimeInterval{
    if (overdueTimeInterval<0)
        overdueTimeInterval*=-1;

    NSInteger minutes = round(overdueTimeInterval)/60;
    NSInteger hours   = minutes/60;
    NSInteger days    = hours/24;
    NSInteger months  = days/30;
    NSInteger years   = months/12;

    NSString* overdueMessage;

    if (years>0){
        overdueMessage = [NSString stringWithFormat:@"%d %@", (years), (years==1?@"year":@"years")];
    }else if (months>0){
        overdueMessage = [NSString stringWithFormat:@"%d %@", (months), (months==1?@"month":@"months")];
    }else if (days>0){
        overdueMessage = [NSString stringWithFormat:@"%d %@", (days), (days==1?@"day":@"days")];
    }else if (hours>0){
        overdueMessage = [NSString stringWithFormat:@"%d %@", (hours), (hours==1?@"hour":@"hours")];
    }else if (minutes>0){
        overdueMessage = [NSString stringWithFormat:@"%d %@", (minutes), (minutes==1?@"minute":@"minutes")];
    }else if (overdueTimeInterval<60){
        overdueMessage = [NSString stringWithFormat:@"a few seconds"];
    }

    return overdueMessage;
}