iOS 根据生日（单位秒）转换成一个年龄

//根据生日（单位秒）转换成一个年龄

+ (double)brithDayToAge:(longlong)birthDay;

+ (double)brithDayToAge:(longlong)birthDay

{

    long long time = birthDay /1000;

    NSDate *date = [NSDatedateWithTimeIntervalSince1970:time];

    NSTimeInterval dateDiff = [date timeIntervalSinceNow];

    double age = fabs(trunc(dateDiff/(60 * 60 * 24)) / 365.0);

    return age;

}