gistfile1.txt

// Last active bace on nsdate
+ (NSString * __nonnull)sellerLastActiveStringWithSellerLastActivDate:(NSDate * __nullable)sellerLastActive
                                                       isSellerOnline:(BOOL)isSellerOnline {
    NSString *timeString = @"";
    if (sellerLastActive == nil) {
        //do nothing
    }
    else if (isSellerOnline) {
        timeString = @"Online";
    }
    else {
        NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
        NSDateComponents *components = [gregorianCalendar components: (NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSCalendarUnitSecond | NSCalendarUnitMonth )
                                                            fromDate:sellerLastActive
                                                              toDate:[NSDate date]
                                                             options:0];
        NSString *(^oneTimeOrSStringBlock)(NSString * prefixString,
                                           BOOL shouldAddPrefix,
                                           NSString * timeString,
                                           NSInteger number) = ^NSString *(NSString * prefixString,
                                                                           BOOL shouldAddPrefix,
                                                                           NSString * timeString,
                                                                           NSInteger number) {
            if (number == 0) {
                return @"";
            }
            else if (number == 1) {
                return [NSString stringWithFormat:@"%@One %@",(shouldAddPrefix ? prefixString : @""), timeString];
            }
            else {
                return [NSString stringWithFormat:@"%@%ld %@s",(shouldAddPrefix ? prefixString : @""), number, timeString];
            }
        };
        
        if (components.month > 0) {
            timeString = @"More than a month ago";
        }
        else if (components.day > 7) {
            timeString = @"More than a week ago";
        }
        else if (components.day > 1) {
            timeString = [NSString stringWithFormat:@"%@%@ ago", oneTimeOrSStringBlock(@"", NO, @"day", components.day),
                          oneTimeOrSStringBlock(@" ,", YES, @"hour", components.hour)];
        }
        else {
            timeString = [NSString stringWithFormat:@"%@%@ ago", oneTimeOrSStringBlock(@"", NO, @"hour", components.hour),
                          oneTimeOrSStringBlock(@" ,", components.hour > 0, @"minute", components.minute)];
        }
        
        if ((components.month == 0 && components.day == 0 && components.hour == 0 && components.minute == 0) ){
            timeString = @"Online";
        }
    }
    
    return timeString;
    
    //http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an
    
//    NSLog(@"timestring = %@", timeString);
//    NSLog(@"year %ld", [components year]);
//    NSLog(@"month %ld", [components month]);
//    NSLog(@"day %ld", [components day]);
//    NSLog(@"hour %ld", [components hour]);
//    NSLog(@"minute %ld", [components minute]);
//    NSLog(@"second %ld", [components second]);
}