iOS转换Unix时间戳

- (NSString *)formateTime:(long long)time
{
    NSDate *date = [NSDate dateWithTimeIntervalSince1970:time/1000];//取到秒，此处time单位是毫秒
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    
    return [formatter stringFromDate:date];
}