Getting issue in date formate

Getting issue in date formate I have the date formate like

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss"];
    // Always use this locale when parsing fixed format date strings
    NSLocale *posix = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
    [formatter setLocale:posix];
    NSDate *date21 = [formatter dateFromString:time];
    [formatter setDateFormat:@"hh:mm:ss a"];
    NSString *a  = [formatter stringFromDate:date21];
    NSLog(@"a = %@", a);


    //NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss"];
    NSDate *startdate = [dateFormatter dateFromString:time];
    [dateFormatter setDateFormat:@"hh:mm:ss a"];
    NSString *time1 = [dateFormatter stringFromDate:startdate];
    NSLog(@"%@",time1);

converting date right but time not get right