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datetime.cs
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datetime.cs
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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System {
using System;
using System.Threading;
using System.Globalization;
using System.Runtime;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
using System.Runtime.Versioning;
using System.Security;
using System.Security.Permissions;
using System.Diagnostics.Contracts;
using CultureInfo = System.Globalization.CultureInfo;
using Calendar = System.Globalization.Calendar;
// This value type represents a date and time. Every DateTime
// object has a private field (Ticks) of type Int64 that stores the
// date and time as the number of 100 nanosecond intervals since
// 12:00 AM January 1, year 1 A.D. in the proleptic Gregorian Calendar.
//
// Starting from V2.0, DateTime also stored some context about its time
// zone in the form of a 3-state value representing Unspecified, Utc or
// Local. This is stored in the two top bits of the 64-bit numeric value
// with the remainder of the bits storing the tick count. This information
// is only used during time zone conversions and is not part of the
// identity of the DateTime. Thus, operations like Compare and Equals
// ignore this state. This is to stay compatible with earlier behavior
// and performance characteristics and to avoid forcing people into dealing
// with the effects of daylight savings. Note, that this has little effect
// on how the DateTime works except in a context where its specific time
// zone is needed, such as during conversions and some parsing and formatting
// cases.
//
// There is also 4th state stored that is a special type of Local value that
// is used to avoid data loss when round-tripping between local and UTC time.
// See below for more information on this 4th state, although it is
// effectively hidden from most users, who just see the 3-state DateTimeKind
// enumeration.
//
// For compatability, DateTime does not serialize the Kind data when used in
// binary serialization.
//
// For a description of various calendar issues, look at
//
// Calendar Studies web site, at
// http://serendipity.nofadz.com/hermetic/cal_stud.htm.
//
//
[StructLayout(LayoutKind.Auto)]
[Serializable]
public struct DateTime : IComparable, IFormattable, IConvertible, ISerializable, IComparable<DateTime>,IEquatable<DateTime> {
// Number of 100ns ticks per time unit
private const long TicksPerMillisecond = 10000;
private const long TicksPerSecond = TicksPerMillisecond * 1000;
private const long TicksPerMinute = TicksPerSecond * 60;
private const long TicksPerHour = TicksPerMinute * 60;
private const long TicksPerDay = TicksPerHour * 24;
// Number of milliseconds per time unit
private const int MillisPerSecond = 1000;
private const int MillisPerMinute = MillisPerSecond * 60;
private const int MillisPerHour = MillisPerMinute * 60;
private const int MillisPerDay = MillisPerHour * 24;
// Number of days in a non-leap year
private const int DaysPerYear = 365;
// Number of days in 4 years
private const int DaysPer4Years = DaysPerYear * 4 + 1; // 1461
// Number of days in 100 years
private const int DaysPer100Years = DaysPer4Years * 25 - 1; // 36524
// Number of days in 400 years
private const int DaysPer400Years = DaysPer100Years * 4 + 1; // 146097
// Number of days from 1/1/0001 to 12/31/1600
private const int DaysTo1601 = DaysPer400Years * 4; // 584388
// Number of days from 1/1/0001 to 12/30/1899
private const int DaysTo1899 = DaysPer400Years * 4 + DaysPer100Years * 3 - 367;
// Number of days from 1/1/0001 to 12/31/1969
internal const int DaysTo1970 = DaysPer400Years * 4 + DaysPer100Years * 3 + DaysPer4Years * 17 + DaysPerYear; // 719,162
// Number of days from 1/1/0001 to 12/31/9999
private const int DaysTo10000 = DaysPer400Years * 25 - 366; // 3652059
internal const long MinTicks = 0;
internal const long MaxTicks = DaysTo10000 * TicksPerDay - 1;
private const long MaxMillis = (long)DaysTo10000 * MillisPerDay;
private const long FileTimeOffset = DaysTo1601 * TicksPerDay;
private const long DoubleDateOffset = DaysTo1899 * TicksPerDay;
// The minimum OA date is 0100/01/01 (Note it's year 100).
// The maximum OA date is 9999/12/31
private const long OADateMinAsTicks = (DaysPer100Years - DaysPerYear) * TicksPerDay;
// All OA dates must be greater than (not >=) OADateMinAsDouble
private const double OADateMinAsDouble = -657435.0;
// All OA dates must be less than (not <=) OADateMaxAsDouble
private const double OADateMaxAsDouble = 2958466.0;
private const int DatePartYear = 0;
private const int DatePartDayOfYear = 1;
private const int DatePartMonth = 2;
private const int DatePartDay = 3;
internal static readonly bool s_isLeapSecondsSupportedSystem = SystemSupportLeapSeconds();
private static readonly int[] DaysToMonth365 = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
private static readonly int[] DaysToMonth366 = {
0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366};
public static readonly DateTime MinValue = new DateTime(MinTicks, DateTimeKind.Unspecified);
public static readonly DateTime MaxValue = new DateTime(MaxTicks, DateTimeKind.Unspecified);
private const UInt64 TicksMask = 0x3FFFFFFFFFFFFFFF;
private const UInt64 FlagsMask = 0xC000000000000000;
private const UInt64 LocalMask = 0x8000000000000000;
private const Int64 TicksCeiling = 0x4000000000000000;
private const UInt64 KindUnspecified = 0x0000000000000000;
private const UInt64 KindUtc = 0x4000000000000000;
private const UInt64 KindLocal = 0x8000000000000000;
private const UInt64 KindLocalAmbiguousDst = 0xC000000000000000;
private const Int32 KindShift = 62;
private const String TicksField = "ticks";
private const String DateDataField = "dateData";
// The data is stored as an unsigned 64-bit integer
// Bits 01-62: The value of 100-nanosecond ticks where 0 represents 1/1/0001 12:00am, up until the value
// 12/31/9999 23:59:59.9999999
// Bits 63-64: A four-state value that describes the DateTimeKind value of the date time, with a 2nd
// value for the rare case where the date time is local, but is in an overlapped daylight
// savings time hour and it is in daylight savings time. This allows distinction of these
// otherwise ambiguous local times and prevents data loss when round tripping from Local to
// UTC time.
private UInt64 dateData;
// Constructs a DateTime from a tick count. The ticks
// argument specifies the date as the number of 100-nanosecond intervals
// that have elapsed since 1/1/0001 12:00am.
//
public DateTime(long ticks) {
if (ticks < MinTicks || ticks > MaxTicks)
throw new ArgumentOutOfRangeException("ticks", Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadTicks"));
Contract.EndContractBlock();
dateData = (UInt64)ticks;
}
private DateTime(UInt64 dateData) {
this.dateData = dateData;
}
public DateTime(long ticks, DateTimeKind kind) {
if (ticks < MinTicks || ticks > MaxTicks) {
throw new ArgumentOutOfRangeException("ticks", Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadTicks"));
}
if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) {
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), "kind");
}
Contract.EndContractBlock();
this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift));
}
internal DateTime(long ticks, DateTimeKind kind, Boolean isAmbiguousDst) {
if (ticks < MinTicks || ticks > MaxTicks) {
throw new ArgumentOutOfRangeException("ticks", Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadTicks"));
}
Contract.Requires(kind == DateTimeKind.Local, "Internal Constructor is for local times only");
Contract.EndContractBlock();
dateData = ((UInt64)ticks | (isAmbiguousDst ? KindLocalAmbiguousDst : KindLocal));
}
// Constructs a DateTime from a given year, month, and day. The
// time-of-day of the resulting DateTime is always midnight.
//
public DateTime(int year, int month, int day) {
this.dateData = (UInt64) DateToTicks(year, month, day);
}
// Constructs a DateTime from a given year, month, and day for
// the specified calendar. The
// time-of-day of the resulting DateTime is always midnight.
//
public DateTime(int year, int month, int day, Calendar calendar)
: this(year, month, day, 0, 0, 0, calendar) {
}
// Constructs a DateTime from a given year, month, day, hour,
// minute, and second.
//
public DateTime(int year, int month, int day, int hour, int minute, int second) {
if (second == 60 && s_isLeapSecondsSupportedSystem && IsValidTimeWithLeapSeconds(year, month, day, hour, minute, second, DateTimeKind.Unspecified))
{
// if we have leap second (second = 60) then we'll need to check if it is valid time.
// if it is valid, then we adjust the second to 59 so DateTime will consider this second is last second
// in the specified minute.
// if it is not valid time, we'll eventually throw.
second = 59;
}
this.dateData = (UInt64)(DateToTicks(year, month, day) + TimeToTicks(hour, minute, second));
}
public DateTime(int year, int month, int day, int hour, int minute, int second, DateTimeKind kind) {
if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) {
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), "kind");
}
Contract.EndContractBlock();
if (second == 60 && s_isLeapSecondsSupportedSystem && IsValidTimeWithLeapSeconds(year, month, day, hour, minute, second, kind))
{
// if we have leap second (second = 60) then we'll need to check if it is valid time.
// if it is valid, then we adjust the second to 59 so DateTime will consider this second is last second
// in the specified minute.
// if it is not valid time, we'll eventually throw.
second = 59;
}
Int64 ticks = DateToTicks(year, month, day) + TimeToTicks(hour, minute, second);
this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift));
}
// Constructs a DateTime from a given year, month, day, hour,
// minute, and second for the specified calendar.
//
public DateTime(int year, int month, int day, int hour, int minute, int second, Calendar calendar) {
if (calendar == null)
throw new ArgumentNullException("calendar");
Contract.EndContractBlock();
int originalSecond = second;
if (second == 60 && s_isLeapSecondsSupportedSystem)
{
// Reset the second value now and then we'll validate it later when we get the final Gregorian date.
second = 59;
}
this.dateData = (UInt64)calendar.ToDateTime(year, month, day, hour, minute, second, 0).Ticks;
if (originalSecond == 60)
{
DateTime dt = new DateTime(dateData);
if (!IsValidTimeWithLeapSeconds(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, 60, DateTimeKind.Unspecified))
{
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadHourMinuteSecond"));
}
}
}
// Constructs a DateTime from a given year, month, day, hour,
// minute, and second.
//
public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond) {
if (millisecond < 0 || millisecond >= MillisPerSecond) {
throw new ArgumentOutOfRangeException("millisecond", Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1));
}
Contract.EndContractBlock();
if (second == 60 && s_isLeapSecondsSupportedSystem && IsValidTimeWithLeapSeconds(year, month, day, hour, minute, second, DateTimeKind.Unspecified))
{
// if we have leap second (second = 60) then we'll need to check if it is valid time.
// if it is valid, then we adjust the second to 59 so DateTime will consider this second is last second
// in the specified minute.
// if it is not valid time, we'll eventually throw.
second = 59;
}
Int64 ticks = DateToTicks(year, month, day) + TimeToTicks(hour, minute, second);
ticks += millisecond * TicksPerMillisecond;
if (ticks < MinTicks || ticks > MaxTicks)
throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange"));
this.dateData = (UInt64)ticks;
}
public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, DateTimeKind kind) {
if (millisecond < 0 || millisecond >= MillisPerSecond) {
throw new ArgumentOutOfRangeException("millisecond", Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1));
}
if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) {
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), "kind");
}
Contract.EndContractBlock();
if (second == 60 && s_isLeapSecondsSupportedSystem && IsValidTimeWithLeapSeconds(year, month, day, hour, minute, second, kind))
{
// if we have leap second (second = 60) then we'll need to check if it is valid time.
// if it is valid, then we adjust the second to 59 so DateTime will consider this second is last second
// in the specified minute.
// if it is not valid time, we'll eventually throw.
second = 59;
}
Int64 ticks = DateToTicks(year, month, day) + TimeToTicks(hour, minute, second);
ticks += millisecond * TicksPerMillisecond;
if (ticks < MinTicks || ticks > MaxTicks)
throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange"));
this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift));
}
// Constructs a DateTime from a given year, month, day, hour,
// minute, and second for the specified calendar.
//
public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, Calendar calendar) {
if (calendar == null)
throw new ArgumentNullException("calendar");
if (millisecond < 0 || millisecond >= MillisPerSecond) {
throw new ArgumentOutOfRangeException("millisecond", Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1));
}
Contract.EndContractBlock();
int originalSecond = second;
if (second == 60 && s_isLeapSecondsSupportedSystem)
{
// Reset the second value now and then we'll validate it later when we get the final Gregorian date.
second = 59;
}
Int64 ticks = calendar.ToDateTime(year, month, day, hour, minute, second, 0).Ticks;
ticks += millisecond * TicksPerMillisecond;
if (ticks < MinTicks || ticks > MaxTicks)
throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange"));
this.dateData = (UInt64)ticks;
if (originalSecond == 60)
{
DateTime dt = new DateTime(dateData);
if (!IsValidTimeWithLeapSeconds(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, 60, DateTimeKind.Unspecified))
{
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadHourMinuteSecond"));
}
}
}
public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, Calendar calendar, DateTimeKind kind) {
if (calendar == null)
throw new ArgumentNullException("calendar");
if (millisecond < 0 || millisecond >= MillisPerSecond) {
throw new ArgumentOutOfRangeException("millisecond", Environment.GetResourceString("ArgumentOutOfRange_Range", 0, MillisPerSecond - 1));
}
if (kind < DateTimeKind.Unspecified || kind > DateTimeKind.Local) {
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidDateTimeKind"), "kind");
}
Contract.EndContractBlock();
int originalSecond = second;
if (second == 60 && s_isLeapSecondsSupportedSystem)
{
// Reset the second value now and then we'll validate it later when we get the final Gregorian date.
second = 59;
}
Int64 ticks = calendar.ToDateTime(year, month, day, hour, minute, second, 0).Ticks;
ticks += millisecond * TicksPerMillisecond;
if (ticks < MinTicks || ticks > MaxTicks)
throw new ArgumentException(Environment.GetResourceString("Arg_DateTimeRange"));
this.dateData = ((UInt64)ticks | ((UInt64)kind << KindShift));
if (originalSecond == 60)
{
DateTime dt = new DateTime(dateData);
if (!IsValidTimeWithLeapSeconds(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute, 60, kind))
{
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadHourMinuteSecond"));
}
}
}
private DateTime(SerializationInfo info, StreamingContext context) {
if (info==null)
throw new ArgumentNullException("info");
Contract.EndContractBlock();
Boolean foundTicks = false;
Boolean foundDateData = false;
Int64 serializedTicks = 0;
UInt64 serializedDateData = 0;
// Get the data
SerializationInfoEnumerator enumerator = info.GetEnumerator();
while( enumerator.MoveNext()) {
switch( enumerator.Name) {
case TicksField:
serializedTicks = Convert.ToInt64(enumerator.Value, CultureInfo.InvariantCulture);
foundTicks = true;
break;
case DateDataField:
serializedDateData = Convert.ToUInt64(enumerator.Value, CultureInfo.InvariantCulture);
foundDateData = true;
break;
default:
// Ignore other fields for forward compatability.
break;
}
}
if (foundDateData) {
this.dateData = serializedDateData;
}
else if (foundTicks) {
this.dateData = (UInt64)serializedTicks;
}
else {
throw new SerializationException(Environment.GetResourceString("Serialization_MissingDateTimeData"));
}
Int64 ticks = InternalTicks;
if (ticks < MinTicks || ticks > MaxTicks) {
throw new SerializationException(Environment.GetResourceString("Serialization_DateTimeTicksOutOfRange"));
}
}
internal Int64 InternalTicks {
get {
return (Int64)(dateData & TicksMask);
}
}
private UInt64 InternalKind {
get {
return (dateData & FlagsMask);
}
}
// Returns the DateTime resulting from adding the given
// TimeSpan to this DateTime.
//
public DateTime Add(TimeSpan value) {
return AddTicks(value._ticks);
}
// Returns the DateTime resulting from adding a fractional number of
// time units to this DateTime.
private DateTime Add(double value, int scale) {
long millis = (long)(value * scale + (value >= 0? 0.5: -0.5));
if (millis <= -MaxMillis || millis >= MaxMillis)
throw new ArgumentOutOfRangeException("value", Environment.GetResourceString("ArgumentOutOfRange_AddValue"));
return AddTicks(millis * TicksPerMillisecond);
}
// Returns the DateTime resulting from adding a fractional number of
// days to this DateTime. The result is computed by rounding the
// fractional number of days given by value to the nearest
// millisecond, and adding that interval to this DateTime. The
// value argument is permitted to be negative.
//
public DateTime AddDays(double value) {
return Add(value, MillisPerDay);
}
// Returns the DateTime resulting from adding a fractional number of
// hours to this DateTime. The result is computed by rounding the
// fractional number of hours given by value to the nearest
// millisecond, and adding that interval to this DateTime. The
// value argument is permitted to be negative.
//
public DateTime AddHours(double value) {
return Add(value, MillisPerHour);
}
// Returns the DateTime resulting from the given number of
// milliseconds to this DateTime. The result is computed by rounding
// the number of milliseconds given by value to the nearest integer,
// and adding that interval to this DateTime. The value
// argument is permitted to be negative.
//
public DateTime AddMilliseconds(double value) {
return Add(value, 1);
}
// Returns the DateTime resulting from adding a fractional number of
// minutes to this DateTime. The result is computed by rounding the
// fractional number of minutes given by value to the nearest
// millisecond, and adding that interval to this DateTime. The
// value argument is permitted to be negative.
//
public DateTime AddMinutes(double value) {
return Add(value, MillisPerMinute);
}
// Returns the DateTime resulting from adding the given number of
// months to this DateTime. The result is computed by incrementing
// (or decrementing) the year and month parts of this DateTime by
// months months, and, if required, adjusting the day part of the
// resulting date downwards to the last day of the resulting month in the
// resulting year. The time-of-day part of the result is the same as the
// time-of-day part of this DateTime.
//
// In more precise terms, considering this DateTime to be of the
// form y / m / d + t, where y is the
// year, m is the month, d is the day, and t is the
// time-of-day, the result is y1 / m1 / d1 + t,
// where y1 and m1 are computed by adding months months
// to y and m, and d1 is the largest value less than
// or equal to d that denotes a valid day in month m1 of year
// y1.
//
public DateTime AddMonths(int months) {
if (months < -120000 || months > 120000) throw new ArgumentOutOfRangeException("months", Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadMonths"));
Contract.EndContractBlock();
int y, m, d;
GetDatePart(out y, out m, out d);
int i = m - 1 + months;
if (i >= 0) {
m = i % 12 + 1;
y = y + i / 12;
}
else {
m = 12 + (i + 1) % 12;
y = y + (i - 11) / 12;
}
if (y < 1 || y > 9999) {
throw new ArgumentOutOfRangeException("months", Environment.GetResourceString("ArgumentOutOfRange_DateArithmetic"));
}
int days = DaysInMonth(y, m);
if (d > days) d = days;
return new DateTime((UInt64)(DateToTicks(y, m, d) + InternalTicks % TicksPerDay) | InternalKind);
}
// Returns the DateTime resulting from adding a fractional number of
// seconds to this DateTime. The result is computed by rounding the
// fractional number of seconds given by value to the nearest
// millisecond, and adding that interval to this DateTime. The
// value argument is permitted to be negative.
//
public DateTime AddSeconds(double value) {
return Add(value, MillisPerSecond);
}
// Returns the DateTime resulting from adding the given number of
// 100-nanosecond ticks to this DateTime. The value argument
// is permitted to be negative.
//
public DateTime AddTicks(long value) {
long ticks = InternalTicks;
if (value > MaxTicks - ticks || value < MinTicks - ticks) {
throw new ArgumentOutOfRangeException("value", Environment.GetResourceString("ArgumentOutOfRange_DateArithmetic"));
}
return new DateTime((UInt64)(ticks + value) | InternalKind);
}
// Returns the DateTime resulting from adding the given number of
// years to this DateTime. The result is computed by incrementing
// (or decrementing) the year part of this DateTime by value
// years. If the month and day of this DateTime is 2/29, and if the
// resulting year is not a leap year, the month and day of the resulting
// DateTime becomes 2/28. Otherwise, the month, day, and time-of-day
// parts of the result are the same as those of this DateTime.
//
public DateTime AddYears(int value) {
if (value < -10000 || value > 10000) throw new ArgumentOutOfRangeException("years", Environment.GetResourceString("ArgumentOutOfRange_DateTimeBadYears"));
Contract.EndContractBlock();
return AddMonths(value * 12);
}
// Compares two DateTime values, returning an integer that indicates
// their relationship.
//
public static int Compare(DateTime t1, DateTime t2) {
Int64 ticks1 = t1.InternalTicks;
Int64 ticks2 = t2.InternalTicks;
if (ticks1 > ticks2) return 1;
if (ticks1 < ticks2) return -1;
return 0;
}
// Compares this DateTime to a given object. This method provides an
// implementation of the IComparable interface. The object
// argument must be another DateTime, or otherwise an exception
// occurs. Null is considered less than any instance.
//
// Returns a value less than zero if this object
public int CompareTo(Object value) {
if (value == null) return 1;
if (!(value is DateTime)) {
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDateTime"));
}
long valueTicks = ((DateTime)value).InternalTicks;
long ticks = InternalTicks;
if (ticks > valueTicks) return 1;
if (ticks < valueTicks) return -1;
return 0;
}
public int CompareTo(DateTime value) {
long valueTicks = value.InternalTicks;
long ticks = InternalTicks;
if (ticks > valueTicks) return 1;
if (ticks < valueTicks) return -1;
return 0;
}
// Returns the tick count corresponding to the given year, month, and day.
// Will check the if the parameters are valid.
private static long DateToTicks(int year, int month, int day) {
if (year >= 1 && year <= 9999 && month >= 1 && month <= 12) {
int[] days = IsLeapYear(year)? DaysToMonth366: DaysToMonth365;
if (day >= 1 && day <= days[month] - days[month - 1]) {
int y = year - 1;
int n = y * 365 + y / 4 - y / 100 + y / 400 + days[month - 1] + day - 1;
return n * TicksPerDay;
}
}
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
}
// Return the tick count corresponding to the given hour, minute, second.
// Will check the if the parameters are valid.
private static long TimeToTicks(int hour, int minute, int second)
{
//TimeSpan.TimeToTicks is a family access function which does no error checking, so
//we need to put some error checking out here.
if (hour >= 0 && hour < 24 && minute >= 0 && minute < 60 && second >=0 && second < 60)
{
return (TimeSpan.TimeToTicks(hour, minute, second));
}
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadHourMinuteSecond"));
}
// Returns the number of days in the month given by the year and
// month arguments.
//
public static int DaysInMonth(int year, int month) {
if (month < 1 || month > 12) throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
Contract.EndContractBlock();
// IsLeapYear checks the year argument
int[] days = IsLeapYear(year)? DaysToMonth366: DaysToMonth365;
return days[month] - days[month - 1];
}
// Converts an OLE Date to a tick count.
// This function is duplicated in COMDateTime.cpp
internal static long DoubleDateToTicks(double value) {
// The check done this way will take care of NaN
if (!(value < OADateMaxAsDouble) || !(value > OADateMinAsDouble))
throw new ArgumentException(Environment.GetResourceString("Arg_OleAutDateInvalid"));
// Conversion to long will not cause an overflow here, as at this point the "value" is in between OADateMinAsDouble and OADateMaxAsDouble
long millis = (long)(value * MillisPerDay + (value >= 0? 0.5: -0.5));
// The interesting thing here is when you have a value like 12.5 it all positive 12 days and 12 hours from 01/01/1899
// However if you a value of -12.25 it is minus 12 days but still positive 6 hours, almost as though you meant -11.75 all negative
// This line below fixes up the millis in the negative case
if (millis < 0) {
millis -= (millis % MillisPerDay) * 2;
}
millis += DoubleDateOffset / TicksPerMillisecond;
if (millis < 0 || millis >= MaxMillis) throw new ArgumentException(Environment.GetResourceString("Arg_OleAutDateScale"));
return millis * TicksPerMillisecond;
}
#if !FEATURE_CORECLR
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
[SecurityCritical]
[ResourceExposure(ResourceScope.None)]
[SuppressUnmanagedCodeSecurity]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool LegacyParseMode();
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
[SecurityCritical]
[ResourceExposure(ResourceScope.None)]
[SuppressUnmanagedCodeSecurity]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool EnableAmPmParseAdjustment();
#endif
// Checks if this DateTime is equal to a given object. Returns
// true if the given object is a boxed DateTime and its value
// is equal to the value of this DateTime. Returns false
// otherwise.
//
public override bool Equals(Object value) {
if (value is DateTime) {
return InternalTicks == ((DateTime)value).InternalTicks;
}
return false;
}
public bool Equals(DateTime value) {
return InternalTicks == value.InternalTicks;
}
// Compares two DateTime values for equality. Returns true if
// the two DateTime values are equal, or false if they are
// not equal.
//
public static bool Equals(DateTime t1, DateTime t2) {
return t1.InternalTicks == t2.InternalTicks;
}
public static DateTime FromBinary(Int64 dateData) {
if ((dateData & (unchecked( (Int64) LocalMask))) != 0) {
// Local times need to be adjusted as you move from one time zone to another,
// just as they are when serializing in text. As such the format for local times
// changes to store the ticks of the UTC time, but with flags that look like a
// local date.
Int64 ticks = dateData & (unchecked((Int64)TicksMask));
// Negative ticks are stored in the top part of the range and should be converted back into a negative number
if (ticks > TicksCeiling - TicksPerDay) {
ticks = ticks - TicksCeiling;
}
// Convert the ticks back to local. If the UTC ticks are out of range, we need to default to
// the UTC offset from MinValue and MaxValue to be consistent with Parse.
Boolean isAmbiguousLocalDst = false;
Int64 offsetTicks;
if (ticks < MinTicks) {
offsetTicks = TimeZoneInfo.GetLocalUtcOffset(DateTime.MinValue, TimeZoneInfoOptions.NoThrowOnInvalidTime).Ticks;
}
else if (ticks > MaxTicks) {
offsetTicks = TimeZoneInfo.GetLocalUtcOffset(DateTime.MaxValue, TimeZoneInfoOptions.NoThrowOnInvalidTime).Ticks;
}
else {
// Because the ticks conversion between UTC and local is lossy, we need to capture whether the
// time is in a repeated hour so that it can be passed to the DateTime constructor.
DateTime utcDt = new DateTime(ticks, DateTimeKind.Utc);
Boolean isDaylightSavings = false;
offsetTicks = TimeZoneInfo.GetUtcOffsetFromUtc(utcDt, TimeZoneInfo.Local, out isDaylightSavings, out isAmbiguousLocalDst).Ticks;
}
ticks += offsetTicks;
// Another behavior of parsing is to cause small times to wrap around, so that they can be used
// to compare times of day
if (ticks < 0) {
ticks += TicksPerDay;
}
if (ticks < MinTicks || ticks > MaxTicks) {
throw new ArgumentException(Environment.GetResourceString("Argument_DateTimeBadBinaryData"), "dateData");
}
return new DateTime(ticks, DateTimeKind.Local, isAmbiguousLocalDst);
}
else {
return DateTime.FromBinaryRaw(dateData);
}
}
// A version of ToBinary that uses the real representation and does not adjust local times. This is needed for
// scenarios where the serialized data must maintain compatability
internal static DateTime FromBinaryRaw(Int64 dateData) {
Int64 ticks = dateData & (Int64)TicksMask;
if (ticks < MinTicks || ticks > MaxTicks)
throw new ArgumentException(Environment.GetResourceString("Argument_DateTimeBadBinaryData"), "dateData");
return new DateTime((UInt64)dateData);
}
// Creates a DateTime from a Windows filetime. A Windows filetime is
// a long representing the date and time as the number of
// 100-nanosecond intervals that have elapsed since 1/1/1601 12:00am.
//
public static DateTime FromFileTime(long fileTime) {
return FromFileTimeUtc(fileTime).ToLocalTime();
}
public static DateTime FromFileTimeUtc(long fileTime) {
if (fileTime < 0 || fileTime > MaxTicks - FileTimeOffset) {
throw new ArgumentOutOfRangeException("fileTime", Environment.GetResourceString("ArgumentOutOfRange_FileTimeInvalid"));
}
Contract.EndContractBlock();
if (s_isLeapSecondsSupportedSystem)
{
return InternalFromFileTime(fileTime);
}
// This is the ticks in Universal time for this fileTime.
long universalTicks = fileTime + FileTimeOffset;
return new DateTime(universalTicks, DateTimeKind.Utc);
}
// Creates a DateTime from an OLE Automation Date.
//
public static DateTime FromOADate(double d) {
return new DateTime(DoubleDateToTicks(d), DateTimeKind.Unspecified);
}
#if FEATURE_SERIALIZATION
[System.Security.SecurityCritical /*auto-generated_required*/]
void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) {
if (info==null) {
throw new ArgumentNullException("info");
}
Contract.EndContractBlock();
// Serialize both the old and the new format
info.AddValue(TicksField, InternalTicks);
info.AddValue(DateDataField, dateData);
}
#endif
public Boolean IsDaylightSavingTime() {
if (Kind == DateTimeKind.Utc) {
return false;
}
return TimeZoneInfo.Local.IsDaylightSavingTime(this, TimeZoneInfoOptions.NoThrowOnInvalidTime);
}
public static DateTime SpecifyKind(DateTime value, DateTimeKind kind) {
return new DateTime(value.InternalTicks, kind);
}
public Int64 ToBinary() {
if (Kind == DateTimeKind.Local) {
// Local times need to be adjusted as you move from one time zone to another,
// just as they are when serializing in text. As such the format for local times
// changes to store the ticks of the UTC time, but with flags that look like a
// local date.
// To match serialization in text we need to be able to handle cases where
// the UTC value would be out of range. Unused parts of the ticks range are
// used for this, so that values just past max value are stored just past the
// end of the maximum range, and values just below minimum value are stored
// at the end of the ticks area, just below 2^62.
TimeSpan offset = TimeZoneInfo.GetLocalUtcOffset(this, TimeZoneInfoOptions.NoThrowOnInvalidTime);
Int64 ticks = Ticks;
Int64 storedTicks = ticks - offset.Ticks;
if (storedTicks < 0) {
storedTicks = TicksCeiling + storedTicks;
}
return storedTicks | (unchecked((Int64) LocalMask));
}
else {
return (Int64)dateData;
}
}
// Return the underlying data, without adjust local times to the right time zone. Needed if performance
// or compatability are important.
internal Int64 ToBinaryRaw() {
return (Int64)dateData;
}
// Returns the date part of this DateTime. The resulting value
// corresponds to this DateTime with the time-of-day part set to
// zero (midnight).
//
public DateTime Date {
get {
Int64 ticks = InternalTicks;
return new DateTime((UInt64)(ticks - ticks % TicksPerDay) | InternalKind);
}
}
// Returns a given date part of this DateTime. This method is used
// to compute the year, day-of-year, month, or day part.
private int GetDatePart(int part) {
Int64 ticks = InternalTicks;
// n = number of days since 1/1/0001
int n = (int)(ticks / TicksPerDay);
// y400 = number of whole 400-year periods since 1/1/0001
int y400 = n / DaysPer400Years;
// n = day number within 400-year period
n -= y400 * DaysPer400Years;
// y100 = number of whole 100-year periods within 400-year period
int y100 = n / DaysPer100Years;
// Last 100-year period has an extra day, so decrement result if 4
if (y100 == 4) y100 = 3;
// n = day number within 100-year period
n -= y100 * DaysPer100Years;
// y4 = number of whole 4-year periods within 100-year period
int y4 = n / DaysPer4Years;
// n = day number within 4-year period
n -= y4 * DaysPer4Years;
// y1 = number of whole years within 4-year period
int y1 = n / DaysPerYear;
// Last year has an extra day, so decrement result if 4
if (y1 == 4) y1 = 3;
// If year was requested, compute and return it
if (part == DatePartYear) {
return y400 * 400 + y100 * 100 + y4 * 4 + y1 + 1;
}
// n = day number within year
n -= y1 * DaysPerYear;
// If day-of-year was requested, return it
if (part == DatePartDayOfYear) return n + 1;
// Leap year calculation looks different from IsLeapYear since y1, y4,
// and y100 are relative to year 1, not year 0
bool leapYear = y1 == 3 && (y4 != 24 || y100 == 3);
int[] days = leapYear? DaysToMonth366: DaysToMonth365;
// All months have less than 32 days, so n >> 5 is a good conservative
// estimate for the month
int m = n >> 5 + 1;
// m = 1-based month number
while (n >= days[m]) m++;
// If month was requested, return it
if (part == DatePartMonth) return m;
// Return 1-based day-of-month
return n - days[m - 1] + 1;
}
// Exactly the same as GetDatePart(int part), except computing all of
// year/month/day rather than just one of them. Used when all three
// are needed rather than redoing the computations for each.
internal void GetDatePart(out int year, out int month, out int day)
{
Int64 ticks = InternalTicks;
// n = number of days since 1/1/0001
int n = (int)(ticks / TicksPerDay);
// y400 = number of whole 400-year periods since 1/1/0001
int y400 = n / DaysPer400Years;
// n = day number within 400-year period
n -= y400 * DaysPer400Years;
// y100 = number of whole 100-year periods within 400-year period
int y100 = n / DaysPer100Years;
// Last 100-year period has an extra day, so decrement result if 4
if (y100 == 4) y100 = 3;
// n = day number within 100-year period
n -= y100 * DaysPer100Years;
// y4 = number of whole 4-year periods within 100-year period
int y4 = n / DaysPer4Years;
// n = day number within 4-year period
n -= y4 * DaysPer4Years;
// y1 = number of whole years within 4-year period
int y1 = n / DaysPerYear;
// Last year has an extra day, so decrement result if 4
if (y1 == 4) y1 = 3;
// compute year
year = y400 * 400 + y100 * 100 + y4 * 4 + y1 + 1;
// n = day number within year
n -= y1 * DaysPerYear;
// dayOfYear = n + 1;
// Leap year calculation looks different from IsLeapYear since y1, y4,
// and y100 are relative to year 1, not year 0
bool leapYear = y1 == 3 && (y4 != 24 || y100 == 3);
int[] days = leapYear ? DaysToMonth366 : DaysToMonth365;
// All months have less than 32 days, so n >> 5 is a good conservative
// estimate for the month
int m = (n >> 5) + 1;
// m = 1-based month number
while (n >= days[m]) m++;
// compute month and day
month = m;
day = n - days[m - 1] + 1;
}
// Returns the day-of-month part of this DateTime. The returned
// value is an integer between 1 and 31.
//
public int Day {
get {
Contract.Ensures(Contract.Result<int>() >= 1);
Contract.Ensures(Contract.Result<int>() <= 31);
return GetDatePart(DatePartDay);
}
}
// Returns the day-of-week part of this DateTime. The returned value
// is an integer between 0 and 6, where 0 indicates Sunday, 1 indicates
// Monday, 2 indicates Tuesday, 3 indicates Wednesday, 4 indicates
// Thursday, 5 indicates Friday, and 6 indicates Saturday.
//
public DayOfWeek DayOfWeek {
get {
Contract.Ensures(Contract.Result<DayOfWeek>() >= DayOfWeek.Sunday);
Contract.Ensures(Contract.Result<DayOfWeek>() <= DayOfWeek.Saturday);
return (DayOfWeek)((InternalTicks / TicksPerDay + 1) % 7);
}
}
// Returns the day-of-year part of this DateTime. The returned value
// is an integer between 1 and 366.
//
public int DayOfYear {
get {
Contract.Ensures(Contract.Result<int>() >= 1);
Contract.Ensures(Contract.Result<int>() <= 366); // leap year
return GetDatePart(DatePartDayOfYear);
}
}
// Returns the hash code for this DateTime.
//
public override int GetHashCode() {
Int64 ticks = InternalTicks;
return unchecked((int)ticks) ^ (int)(ticks >> 32);
}
// Returns the hour part of this DateTime. The returned value is an
// integer between 0 and 23.
//
public int Hour {
get {
Contract.Ensures(Contract.Result<int>() >= 0);
Contract.Ensures(Contract.Result<int>() < 24);
return (int)((InternalTicks / TicksPerHour) % 24);
}
}
internal Boolean IsAmbiguousDaylightSavingTime() {
return (InternalKind == KindLocalAmbiguousDst);
}
[Pure]
public DateTimeKind Kind {