时间戳转换成时间NSString

NSNumber *startTime = jsonObject[@"info"][@"addtime"];
               NSDate *startTimeDate = [NSDate dateWithTimeIntervalSince1970:[startTime intValue]];
               NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
               [formatter setDateFormat:@"yyyy-MM-dd"];//设置源时间字符串的格式
               NSString *targetTime = [formatter stringFromDate:startTimeDate];//将时间转化成目标时间字符串
               self.chargeTitle.text = [NSString stringWithFormat:@"VIP时间：%@", targetTime];