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We are thinking about hiring more developers so I was asked to compose a test. I have been looking online for ideas. I found this question: https://stackoverflow.com/questions/23534528/how-to-add-n-days-to-a-date-in-java-without-importing-date-calendar-from-java-ap. I have attempted this myself as follows:

public class Date : IEquatable<Date>
 
 private readonly static int _daysInMonth = 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ;
 private readonly int _month;
 private readonly int _day;
 private readonly int _year;

 public Date(int day, int month, int year)
 
 this._day = day;
 this._month = month;
 this._year = year;
 

 //static because thinking about using in constructor for validation.
 public static int MaxDays(int month, int year)
 
 int maxDays = _daysInMonth[month - 1];
 if (month == 2)
 ((year % 4 == 0) && (year % 100 != 0)))
 maxDays = maxDays + 1;
 
 return maxDays;
 

 public Date AddDays(int daysToAdd)
 
 int day = this._day + daysToAdd;
 int month = this._month;
 int year = this._year;
 while (day > MaxDays(month,year))
 
 day = day - MaxDays(month,year);
 month++;
 if (month > 12)
 
 year++;
 month = 1;
 
 
 return new Date(day, month, year);
 

 public override bool Equals(object obj)
 
 return Equals(obj as Date);
 

 public override int GetHashCode()
 
 unchecked
 
 int hash = 17;
 hash = hash * 23 + _day.GetHashCode();
 hash = hash * 23 + _month.GetHashCode();
 hash = hash * 23 + _year.GetHashCode();
 return hash;
 
 

 public static bool operator ==(Date date1, Date date2)
 

 public static bool operator !=(Date date1, Date date2)
 
 return !(date1 == date2);
 

 public bool Equals(Date other)
 
 if (ReferenceEquals(other, null))
 return false;
 return _day == other._day && _month == other._month && _year == other._year;
 
 

I would be grateful for comments. I reviewed the terms of posting here: https://codereview.stackexchange.com/help/on-topic. This is real code (no stubs) that works and therefore I believe it is on topic.