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using System;
using System.Collections;
using System.Collections.Generic;
using Npgsql.Util;
#pragma warning disable 1591
// ReSharper disable once CheckNamespace
namespace NpgsqlTypes
{
/// <summary>
/// A struct similar to .NET DateTime but capable of storing PostgreSQL's timestamp and timestamptz types.
/// DateTime is capable of storing values from year 1 to 9999 at 100-nanosecond precision,
/// while PostgreSQL's timestamps store values from 4713BC to 5874897AD with 1-microsecond precision.
/// </summary>
[Serializable]
public readonly struct NpgsqlDateTime : IEquatable<NpgsqlDateTime>, IComparable<NpgsqlDateTime>, IComparable,
IComparer<NpgsqlDateTime>, IComparer
{
#region Fields
readonly NpgsqlDate _date;
readonly TimeSpan _time;
readonly InternalType _type;
#endregion
#region Constants
public static readonly NpgsqlDateTime Epoch = new NpgsqlDateTime(NpgsqlDate.Epoch);
public static readonly NpgsqlDateTime Era = new NpgsqlDateTime(NpgsqlDate.Era);
public static readonly NpgsqlDateTime Infinity =
new NpgsqlDateTime(InternalType.Infinity, NpgsqlDate.Era, TimeSpan.Zero);
public static readonly NpgsqlDateTime NegativeInfinity =
new NpgsqlDateTime(InternalType.NegativeInfinity, NpgsqlDate.Era, TimeSpan.Zero);
// 9999-12-31
private const int MaxDateTimeDay = 3652058;
#endregion
#region Constructors
NpgsqlDateTime(InternalType type, NpgsqlDate date, TimeSpan time)
{
if (!date.IsFinite && type != InternalType.Infinity && type != InternalType.NegativeInfinity)
throw new ArgumentException("Can't construct an NpgsqlDateTime with a non-finite date, use Infinity and NegativeInfinity instead", nameof(date));
_type = type;
_date = date;
_time = time;
}
public NpgsqlDateTime(NpgsqlDate date, TimeSpan time, DateTimeKind kind = DateTimeKind.Unspecified)
: this(KindToInternalType(kind), date, time) {}
public NpgsqlDateTime(NpgsqlDate date)
: this(date, TimeSpan.Zero) {}
public NpgsqlDateTime(int year, int month, int day, int hours, int minutes, int seconds, DateTimeKind kind=DateTimeKind.Unspecified)
: this(new NpgsqlDate(year, month, day), new TimeSpan(0, hours, minutes, seconds), kind) {}
public NpgsqlDateTime(int year, int month, int day, int hours, int minutes, int seconds, int milliseconds, DateTimeKind kind = DateTimeKind.Unspecified)
: this(new NpgsqlDate(year, month, day), new TimeSpan(0, hours, minutes, seconds, milliseconds), kind) { }
public NpgsqlDateTime(DateTime dateTime)
: this(new NpgsqlDate(dateTime.Date), dateTime.TimeOfDay, dateTime.Kind) {}
public NpgsqlDateTime(long ticks, DateTimeKind kind)
: this(new DateTime(ticks, kind)) { }
public NpgsqlDateTime(long ticks)
: this(new DateTime(ticks, DateTimeKind.Unspecified)) { }
#endregion
#region Public Properties
public NpgsqlDate Date => _date;
public TimeSpan Time => _time;
public int DayOfYear => _date.DayOfYear;
public int Year => _date.Year;
public int Month => _date.Month;
public int Day => _date.Day;
public DayOfWeek DayOfWeek => _date.DayOfWeek;
public bool IsLeapYear => _date.IsLeapYear;
public long Ticks => _date.DaysSinceEra * NpgsqlTimeSpan.TicksPerDay + _time.Ticks;
public int Millisecond => _time.Milliseconds;
public int Second => _time.Seconds;
public int Minute => _time.Minutes;
public int Hour => _time.Hours;
public bool IsInfinity => _type == InternalType.Infinity;
public bool IsNegativeInfinity => _type == InternalType.NegativeInfinity;
public bool IsFinite
{
get
{
switch (_type) {
case InternalType.FiniteUnspecified:
case InternalType.FiniteUtc:
case InternalType.FiniteLocal:
return true;
case InternalType.Infinity:
case InternalType.NegativeInfinity:
return false;
default:
throw new InvalidOperationException($"Internal Npgsql bug: unexpected value {_type} of enum {nameof(NpgsqlDateTime)}.{nameof(InternalType)}. Please file a bug.");
}
}
}
public DateTimeKind Kind
{
get
{
switch (_type)
{
case InternalType.FiniteUtc:
return DateTimeKind.Utc;
case InternalType.FiniteLocal:
return DateTimeKind.Local;
case InternalType.FiniteUnspecified:
case InternalType.Infinity:
case InternalType.NegativeInfinity:
return DateTimeKind.Unspecified;
default:
throw new InvalidOperationException($"Internal Npgsql bug: unexpected value {_type} of enum {nameof(DateTimeKind)}. Please file a bug.");
}
}
}
/// <summary>
/// Cast of an <see cref="NpgsqlDateTime"/> to a <see cref="DateTime"/>.
/// </summary>
/// <returns>An equivalent <see cref="DateTime"/>.</returns>
public DateTime ToDateTime()
{
if (!IsFinite)
throw new InvalidCastException("Can't convert infinite timestamp values to DateTime");
if (_date.DaysSinceEra < 0 || _date.DaysSinceEra > MaxDateTimeDay)
throw new InvalidCastException("Out of the range of DateTime (year must be between 1 and 9999)");
return new DateTime(Ticks, Kind);
}
/// <summary>
/// Converts the value of the current <see cref="NpgsqlDateTime"/> object to Coordinated Universal Time (UTC).
/// </summary>
/// <remarks>
/// See the MSDN documentation for DateTime.ToUniversalTime().
/// <b>Note:</b> this method <b>only</b> takes into account the time zone's base offset, and does
/// <b>not</b> respect daylight savings. See https://github.com/npgsql/npgsql/pull/684 for more
/// details.
/// </remarks>
public NpgsqlDateTime ToUniversalTime()
{
switch (_type)
{
case InternalType.FiniteUnspecified:
// Treat as Local
case InternalType.FiniteLocal:
if (_date.DaysSinceEra >= 1 && _date.DaysSinceEra <= MaxDateTimeDay - 1)
{
// Day between 0001-01-02 and 9999-12-30, so we can use DateTime and it will always succeed
return new NpgsqlDateTime(Subtract(TimeZoneInfo.Local.GetUtcOffset(new DateTime(ToDateTime().Ticks, DateTimeKind.Local))).Ticks, DateTimeKind.Utc);
}
// Else there are no DST rules available in the system for outside the DateTime range, so just use the base offset
return new NpgsqlDateTime(Subtract(TimeZoneInfo.Local.BaseUtcOffset).Ticks, DateTimeKind.Utc);
case InternalType.FiniteUtc:
case InternalType.Infinity:
case InternalType.NegativeInfinity:
return this;
default:
throw new InvalidOperationException($"Internal Npgsql bug: unexpected value {_type} of enum {nameof(NpgsqlDateTime)}.{nameof(InternalType)}. Please file a bug.");
}
}
/// <summary>
/// Converts the value of the current <see cref="NpgsqlDateTime"/> object to local time.
/// </summary>
/// <remarks>
/// See the MSDN documentation for DateTime.ToLocalTime().
/// <b>Note:</b> this method <b>only</b> takes into account the time zone's base offset, and does
/// <b>not</b> respect daylight savings. See https://github.com/npgsql/npgsql/pull/684 for more
/// details.
/// </remarks>
public NpgsqlDateTime ToLocalTime()
{
switch (_type) {
case InternalType.FiniteUnspecified:
// Treat as UTC
case InternalType.FiniteUtc:
if (_date.DaysSinceEra >= 1 && _date.DaysSinceEra <= MaxDateTimeDay - 1)
{
// Day between 0001-01-02 and 9999-12-30, so we can use DateTime and it will always succeed
return new NpgsqlDateTime(TimeZoneInfo.ConvertTime(new DateTime(ToDateTime().Ticks, DateTimeKind.Utc), TimeZoneInfo.Local));
}
// Else there are no DST rules available in the system for outside the DateTime range, so just use the base offset
return new NpgsqlDateTime(Add(TimeZoneInfo.Local.BaseUtcOffset).Ticks, DateTimeKind.Local);
case InternalType.FiniteLocal:
case InternalType.Infinity:
case InternalType.NegativeInfinity:
return this;
default:
throw new InvalidOperationException($"Internal Npgsql bug: unexpected value {_type} of enum {nameof(NpgsqlDateTime)}.{nameof(InternalType)}. Please file a bug.");
}
}
public static NpgsqlDateTime Now => new NpgsqlDateTime(DateTime.Now);
#endregion
#region String Conversions
public override string ToString()
{
switch (_type) {
case InternalType.Infinity:
return "infinity";
case InternalType.NegativeInfinity:
return "-infinity";
default:
return $"{_date} {_time}";
}
}
public static NpgsqlDateTime Parse(string str)
{
if (str == null) {
throw new NullReferenceException();
}
switch (str = str.Trim().ToLowerInvariant()) {
case "infinity":
return Infinity;
case "-infinity":
return NegativeInfinity;
default:
try {
var idxSpace = str.IndexOf(' ');
var datePart = str.Substring(0, idxSpace);
if (str.Contains("bc")) {
datePart += " BC";
}
var idxSecond = str.IndexOf(' ', idxSpace + 1);
if (idxSecond == -1) {
idxSecond = str.Length;
}
var timePart = str.Substring(idxSpace + 1, idxSecond - idxSpace - 1);
return new NpgsqlDateTime(NpgsqlDate.Parse(datePart), TimeSpan.Parse(timePart));
} catch (OverflowException) {
throw;
} catch {
throw new FormatException();
}
}
}
#endregion
#region Comparisons
public bool Equals(NpgsqlDateTime other)
{
switch (_type) {
case InternalType.Infinity:
return other._type == InternalType.Infinity;
case InternalType.NegativeInfinity:
return other._type == InternalType.NegativeInfinity;
default:
return other._type == _type && _date.Equals(other._date) && _time.Equals(other._time);
}
}
public override bool Equals(object? obj)
=> obj is NpgsqlDateTime time && Equals(time);
public override int GetHashCode()
{
switch (_type) {
case InternalType.Infinity:
return int.MaxValue;
case InternalType.NegativeInfinity:
return int.MinValue;
default:
return _date.GetHashCode() ^ PGUtil.RotateShift(_time.GetHashCode(), 16);
}
}
public int CompareTo(NpgsqlDateTime other)
{
switch (_type) {
case InternalType.Infinity:
return other._type == InternalType.Infinity ? 0 : 1;
case InternalType.NegativeInfinity:
return other._type == InternalType.NegativeInfinity ? 0 : -1;
default:
switch (other._type) {
case InternalType.Infinity:
return -1;
case InternalType.NegativeInfinity:
return 1;
default:
var cmp = _date.CompareTo(other._date);
return cmp == 0 ? _time.CompareTo(other._time) : cmp;
}
}
}
#nullable disable
public int CompareTo(object o)
{
if (o == null)
return 1;
if (o is NpgsqlDateTime)
return CompareTo((NpgsqlDateTime)o);
throw new ArgumentException();
}
public int Compare(NpgsqlDateTime x, NpgsqlDateTime y) => x.CompareTo(y);
public int Compare(object x, object y)
{
if (x == null)
return y == null ? 0 : -1;
if (y == null)
return 1;
if (!(x is IComparable) || !(y is IComparable))
throw new ArgumentException();
return ((IComparable)x).CompareTo(y);
}
#nullable enable
#endregion
#region Arithmetic
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the value of the specified TimeSpan to the value of this instance.
/// </summary>
/// <param name="value">A positive or negative time interval.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the time interval represented by value.</returns>
public NpgsqlDateTime Add(NpgsqlTimeSpan value) { return AddTicks(value.Ticks); }
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the value of the specified <see cref="NpgsqlTimeSpan"/> to the value of this instance.
/// </summary>
/// <param name="value">A positive or negative time interval.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the time interval represented by value.</returns>
public NpgsqlDateTime Add(TimeSpan value) { return AddTicks(value.Ticks); }
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of years to the value of this instance.
/// </summary>
/// <param name="value">A number of years. The value parameter can be negative or positive.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the number of years represented by value.</returns>
public NpgsqlDateTime AddYears(int value)
{
switch (_type) {
case InternalType.Infinity:
case InternalType.NegativeInfinity:
return this;
default:
return new NpgsqlDateTime(_type, _date.AddYears(value), _time);
}
}
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of months to the value of this instance.
/// </summary>
/// <param name="value">A number of months. The months parameter can be negative or positive.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and months.</returns>
public NpgsqlDateTime AddMonths(int value)
{
switch (_type) {
case InternalType.Infinity:
case InternalType.NegativeInfinity:
return this;
default:
return new NpgsqlDateTime(_type, _date.AddMonths(value), _time);
}
}
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of days to the value of this instance.
/// </summary>
/// <param name="value">A number of whole and fractional days. The value parameter can be negative or positive.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the number of days represented by value.</returns>
public NpgsqlDateTime AddDays(double value) { return Add(TimeSpan.FromDays(value)); }
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of hours to the value of this instance.
/// </summary>
/// <param name="value">A number of whole and fractional hours. The value parameter can be negative or positive.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the number of hours represented by value.</returns>
public NpgsqlDateTime AddHours(double value) { return Add(TimeSpan.FromHours(value)); }
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of minutes to the value of this instance.
/// </summary>
/// <param name="value">A number of whole and fractional minutes. The value parameter can be negative or positive.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the number of minutes represented by value.</returns>
public NpgsqlDateTime AddMinutes(double value) { return Add(TimeSpan.FromMinutes(value)); }
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of minutes to the value of this instance.
/// </summary>
/// <param name="value">A number of whole and fractional minutes. The value parameter can be negative or positive.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the number of minutes represented by value.</returns>
public NpgsqlDateTime AddSeconds(double value) { return Add(TimeSpan.FromSeconds(value)); }
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of milliseconds to the value of this instance.
/// </summary>
/// <param name="value">A number of whole and fractional milliseconds. The value parameter can be negative or positive. Note that this value is rounded to the nearest integer.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the number of milliseconds represented by value.</returns>
public NpgsqlDateTime AddMilliseconds(double value) { return Add(TimeSpan.FromMilliseconds(value)); }
/// <summary>
/// Returns a new <see cref="NpgsqlDateTime"/> that adds the specified number of ticks to the value of this instance.
/// </summary>
/// <param name="value">A number of 100-nanosecond ticks. The value parameter can be positive or negative.</param>
/// <returns>An object whose value is the sum of the date and time represented by this instance and the time represented by value.</returns>
public NpgsqlDateTime AddTicks(long value)
{
switch (_type) {
case InternalType.Infinity:
case InternalType.NegativeInfinity:
return this;
default:
return new NpgsqlDateTime(Ticks + value, Kind);
}
}
public NpgsqlDateTime Subtract(NpgsqlTimeSpan interval)
{
return Add(-interval);
}
public NpgsqlTimeSpan Subtract(NpgsqlDateTime timestamp)
{
switch (_type) {
case InternalType.Infinity:
case InternalType.NegativeInfinity:
throw new InvalidOperationException("You cannot subtract infinity timestamps");
}
switch (timestamp._type) {
case InternalType.Infinity:
case InternalType.NegativeInfinity:
throw new InvalidOperationException("You cannot subtract infinity timestamps");
}
return new NpgsqlTimeSpan(0, _date.DaysSinceEra - timestamp._date.DaysSinceEra, _time.Ticks - timestamp._time.Ticks);
}
#endregion
#region Operators
public static NpgsqlDateTime operator +(NpgsqlDateTime timestamp, NpgsqlTimeSpan interval)
=> timestamp.Add(interval);
public static NpgsqlDateTime operator +(NpgsqlTimeSpan interval, NpgsqlDateTime timestamp)
=> timestamp.Add(interval);
public static NpgsqlDateTime operator -(NpgsqlDateTime timestamp, NpgsqlTimeSpan interval)
=> timestamp.Subtract(interval);
public static NpgsqlTimeSpan operator -(NpgsqlDateTime x, NpgsqlDateTime y) => x.Subtract(y);
public static bool operator ==(NpgsqlDateTime x, NpgsqlDateTime y) => x.Equals(y);
public static bool operator !=(NpgsqlDateTime x, NpgsqlDateTime y) => !(x == y);
public static bool operator <(NpgsqlDateTime x, NpgsqlDateTime y) => x.CompareTo(y) < 0;
public static bool operator >(NpgsqlDateTime x, NpgsqlDateTime y) => x.CompareTo(y) > 0;
public static bool operator <=(NpgsqlDateTime x, NpgsqlDateTime y) => x.CompareTo(y) <= 0;
public static bool operator >=(NpgsqlDateTime x, NpgsqlDateTime y) => x.CompareTo(y) >= 0;
#endregion
#region Casts
/// <summary>
/// Implicit cast of a <see cref="DateTime"/> to an <see cref="NpgsqlDateTime"/>
/// </summary>
/// <param name="dateTime">A <see cref="DateTime"/></param>
/// <returns>An equivalent <see cref="NpgsqlDateTime"/>.</returns>
public static implicit operator NpgsqlDateTime(DateTime dateTime) => ToNpgsqlDateTime(dateTime);
public static NpgsqlDateTime ToNpgsqlDateTime(DateTime dateTime) => new NpgsqlDateTime(dateTime);
/// <summary>
/// Explicit cast of an <see cref="NpgsqlDateTime"/> to a <see cref="DateTime"/>.
/// </summary>
/// <param name="npgsqlDateTime">An <see cref="NpgsqlDateTime"/>.</param>
/// <returns>An equivalent <see cref="DateTime"/>.</returns>
public static explicit operator DateTime(NpgsqlDateTime npgsqlDateTime)
=> npgsqlDateTime.ToDateTime();
#endregion
public NpgsqlDateTime Normalize() => Add(NpgsqlTimeSpan.Zero);
static InternalType KindToInternalType(DateTimeKind kind)
{
switch (kind) {
case DateTimeKind.Unspecified:
return InternalType.FiniteUnspecified;
case DateTimeKind.Utc:
return InternalType.FiniteUtc;
case DateTimeKind.Local:
return InternalType.FiniteLocal;
default:
throw new InvalidOperationException($"Internal Npgsql bug: unexpected value {kind} of enum {nameof(NpgsqlDateTime)}.{nameof(InternalType)}. Please file a bug.");
}
}
enum InternalType
{
FiniteUnspecified,
FiniteUtc,
FiniteLocal,
Infinity,
NegativeInfinity
}
}
}