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Date.cs
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Date.cs
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using System;
namespace dotnet_tools
{
/// <summary>
/// Wraps up the <see cref="DateTime"/> type in order to work only with the date portion,
/// to support casts from and to <see cref="string"/> and <see cref="DateTime"/> instances,
/// and to provide various operators on the <see cref="Date"/> type.
/// </summary>
public struct Date : IComparable, IComparable<Date>, IEquatable<Date>
{
#region Static Properties
public static Date MinValue => DateTime.MinValue;
public static Date MaxValue => DateTime.MaxValue;
public static Date Today => DateTime.Today;
public static int CurrentYear => Today.Year;
#endregion
#region Parameter Constructors
/// <summary>
/// Initializes a new instance of the <see cref="Date"/> structure to the year, month and day specified by the
/// <see cref="DateTime"/> <paramref name="d"/> argument.
/// </summary>
///
/// <param name="d">The <see cref="DateTime"/> parameter providing the <c>date</c> portion.</param>
public Date(DateTime d) => DateTimeInstance = d.Date; // DateTime is a struct, which is a ValueType, and variable values are copied.
/// <summary>
/// Initializes a new instance of the <see cref="Date"/> structure to the specified date represented by the
/// <paramref name="s"/> <see cref="string"/>.
/// </summary>
///
/// <param name="s">
/// A <see cref="string"/> that contains a date to convert.
/// </param>
///
/// <exception cref="ArgumentNullException">
/// Occures when <paramref name="s"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="FormatException">
/// Occures when <paramref name="s"/> does not contain a valid string representation of a date.
/// </exception>
public Date(string s)
{
try
{
DateTimeInstance = DateTime.Parse(s);
}
catch (ArgumentNullException ex)
{
throw new ArgumentNullException(ex.Message);
}
catch (FormatException ex)
{
throw new FormatException(ex.Message);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Date"/> structure to the specified year, month and day.
/// </summary>
///
/// <param name="year"> The year (1 through 9999). </param>
/// <param name="month">The month (1 through 12). </param>
/// <param name="day"> The day (1 through the number of days in month).</param>
///
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when <paramref name="year"/> is less than 1 or greater than 9999.
/// -or-
/// <paramref name="month"/> is less than 1 or greater than 12.
/// -or-
/// <paramref name="day"/> is less than 1 or greater than the number of days in month.
/// </exception>
public Date(int year, int month, int day)
{
try
{
DateTimeInstance = new DateTime(year, month, day);
}
catch (ArgumentOutOfRangeException ex)
{
throw new ArgumentOutOfRangeException(ex.Message);
}
}
#endregion
#region Properties
/// <summary>
/// Gets (and privately sets) the DateTime component of the date represented by this instance.
/// </summary>
public DateTime DateTimeInstance { get; private set; }
/// <summary>
/// Gets (and privately sets) the year component of the date represented by this instance.
/// </summary>
///
/// <exception cref="ArgumentOutOfRangeException">
/// Occures on set when the given <see langword="value"/> is less than 1 or greater than 9999.
/// </exception>
public int Year
{
get => DateTimeInstance.Year;
private set
{
try
{
DateTimeInstance = new DateTime(value, Month, Day);
}
catch (ArgumentOutOfRangeException ex)
{
throw new ArgumentOutOfRangeException(ex.Message);
}
}
}
/// <summary>
/// Gets (and privately sets) the month component of the date represented by this instance.
/// </summary>
///
/// <exception cref="ArgumentOutOfRangeException">
/// Occures on set when the given <see langword="value"/> is less than 1 or greater than 12.
/// </exception>
public int Month
{
get => DateTimeInstance.Month;
private set
{
try
{
DateTimeInstance = new DateTime(Year, value, Day);
}
catch (ArgumentOutOfRangeException ex)
{
throw new ArgumentOutOfRangeException(ex.Message);
}
}
}
/// <summary>
/// Gets (or privately sets) the day of the month represented by this instance.
/// </summary>
///
/// <exception cref="ArgumentOutOfRangeException">
/// Occures on set when the given <see langword="value"/> is less than 1 or greater than
/// the number of days in month.
/// </exception>
public int Day
{
get => DateTimeInstance.Day;
private set
{
try
{
DateTimeInstance = new DateTime(Year, Month, value);
}
catch (ArgumentOutOfRangeException ex)
{
throw new ArgumentOutOfRangeException(ex.Message);
}
}
}
public DayOfWeek DayOfWeek => DateTimeInstance.DayOfWeek;
public int DayOfYear => DateTimeInstance.DayOfYear;
#endregion
#region Interfaces Implementations
/// <summary></summary>
/// <exception cref="ArgumentException">
/// Occures when <paramref name="obj"/> isn't of type <see cref="Date"/>.
/// </exception>
public int CompareTo(object obj)
{
// null is less anyway (obj's type doesn't matter):
if (obj == null)
return 1;
if (obj is Date other)
return CompareTo(other);
throw new ArgumentException("The parameter obj must be of type Date.");
}
public int CompareTo(Date other) =>
DateTimeInstance.CompareTo(other.DateTimeInstance);
public bool Equals(Date other) => CompareTo(other) == 0;
#endregion
#region More Methods
public static int Compare(Date d1, Date d2) => d1.CompareTo(d2);
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public Date AddDays(in int days) => DateTimeInstance.AddDays(days);
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>, or <paramref name="months"/> is less than
/// -120,000 or greater than 120,000.
/// </exception>
public Date AddMonths(in int months) => DateTimeInstance.AddMonths(months);
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public Date AddYears(in int years) => DateTimeInstance.AddYears(years);
/// <summary>
/// Returns the number of days in the specified month and year.
/// </summary>
///
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="month"/> is less than 1 or greater than 12. -or-
/// <paramref name="year"/> is less than 1 or greater than 9999.
/// </exception>
public static int DaysInMonth(int year, int month) =>
DateTime.DaysInMonth(year, month);
public static bool Equals(Date a, Date b) =>
a.Equals(b);
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when <paramref name="year"/> is less than 1 or greater than 9999.
/// </exception>
public static bool IsLeapYear(int year) =>
DateTime.IsLeapYear(year);
#endregion
#region More Methods - Overrides
public override bool Equals(object obj)
{
if (obj == null)
return false;
if (obj is Date other)
return Equals(other);
return false;
}
public override int GetHashCode() => DateTimeInstance.GetHashCode();
public override string ToString() =>
DateTimeInstance.ToShortDateString();
#endregion
#region Operators
#region Increment and Decrement
/// <summary>
/// Adds one day to this <see cref="Date"/>.
/// </summary>
///
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public static Date operator ++(Date date) => date.AddDays(1);
/// <summary>
/// Subtracts one day from this <see cref="Date"/>.
/// </summary>
///
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public static Date operator --(Date date) => date.AddDays(-1);
#endregion
#region Date Algebra
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public static Date operator +(Date date, int days) => date.AddDays(days);
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public static Date operator +(int days, Date date) => date.AddDays(days);
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public static Date operator -(Date date, int days) => date.AddDays(-days);
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when The resulting <see cref="Date"/> is less than <see cref="MinValue"/>
/// or greater than <see cref="MaxValue"/>.
/// </exception>
public static Date operator -(int days, Date date) => date.AddDays(-days);
/// <summary>
/// Subtracts a specified date from another specified date and returns a time interval, in days.
/// </summary>
/// <param name="lhs">The date value to subtract from (the minuend).</param>
/// <param name="rhs">The date value to subtract (the subtrahend).</param>
/// <returns>The time difference between the dates, in number of days.</returns>
public static int operator -(Date lhs, Date rhs) =>
(int)(lhs.DateTimeInstance - rhs.DateTimeInstance).TotalDays;
#endregion
#region Comparison
public static bool operator <(Date a, Date b) => a.CompareTo(b) < 0;
public static bool operator >(Date a, Date b) => a.CompareTo(b) > 0;
public static bool operator <=(Date a, Date b) => a.CompareTo(b) <= 0;
public static bool operator >=(Date a, Date b) => a.CompareTo(b) >= 0;
public static bool operator ==(Date a, Date b) => a.CompareTo(b) == 0;
public static bool operator !=(Date a, Date b) => a.CompareTo(b) != 0;
#endregion
#endregion
#region Casts
/// <summary>
/// From <see cref="DateTime"/> to <see cref="Date"/>.
/// <para> Example: </para>
/// <c><see cref="Date"/> date = <see langword="new"/> <see cref="DateTime"/>();</c>
/// </summary>
public static implicit operator Date(DateTime d) => new Date(d);
/// <summary>
/// From <see cref="Date"/> to <see cref="DateTime"/>.
/// <para> Example: </para>
/// <c><see cref="DateTime"/> d = <see langword="new"/> <see cref="Date"/>();</c>
/// </summary>
///
/// <exception cref="ArgumentOutOfRangeException">
/// Occures when <paramref name="d"/>'s year is less than 1 or greater than 9999.
/// -or-
/// <paramref name="d"/>'s month is less than 1 or greater than 12.
/// -or-
/// <paramref name="d"/>'s day is less than 1 or greater than the number of days in month.
/// </exception>
public static implicit operator DateTime(Date d) => new DateTime(d.Year, d.Month, d.Day);
/// <summary>
/// From <see cref="string"/> to <see cref="Date"/>.
/// <para> Example: </para>
/// <c><see cref="Date"/> date = "1.1.2000";</c>
/// </summary>
///
/// <param name="s">
/// A <see cref="string"/> that contains a date to convert.
/// </param>
///
/// <exception cref="ArgumentNullException">
/// Occures when <paramref name="s"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="FormatException">
/// Occures when <paramref name="s"/> does not contain a valid string representation of a date.
/// </exception>
public static implicit operator Date(string s)
{
try
{
return new Date(s);
}
catch (ArgumentNullException ex)
{
throw new ArgumentNullException(ex.Message);
}
catch (FormatException ex)
{
throw new FormatException(ex.Message);
}
}
/// <summary>
/// From <see cref="Date"/> to <see cref="string"/>.
/// <para> Example: </para>
/// <c><see cref="string"/> s = <see langword="new"/> <see cref="Date()"/>;</c>
/// </summary>
public static implicit operator string(Date d) => d.ToString();
#endregion
}
}