| | | 1 | | // Licensed to the .NET Foundation under one or more agreements. |
| | | 2 | | // The .NET Foundation licenses this file to you under the MIT license. |
| | | 3 | | |
| | | 4 | | using System.Diagnostics; |
| | | 5 | | using System.Runtime.InteropServices; |
| | | 6 | | |
| | | 7 | | namespace System.Globalization |
| | | 8 | | { |
| | | 9 | | // This abstract class represents a calendar. A calendar reckons time in |
| | | 10 | | // divisions such as weeks, months and years. The number, length and start of |
| | | 11 | | // the divisions vary in each calendar. |
| | | 12 | | // |
| | | 13 | | // Any instant in time can be represented as an n-tuple of numeric values using |
| | | 14 | | // a particular calendar. For example, the next vernal equinox occurs at (0.0, 0 |
| | | 15 | | // , 46, 8, 20, 3, 1999) in the Gregorian calendar. An implementation of |
| | | 16 | | // Calendar can map any DateTime value to such an n-tuple and vice versa. The |
| | | 17 | | // DateTimeFormat class can map between such n-tuples and a textual |
| | | 18 | | // representation such as "8:46 AM March 20th 1999 AD". |
| | | 19 | | // |
| | | 20 | | // Most calendars identify a year which begins the current era. There may be any |
| | | 21 | | // number of previous eras. The Calendar class identifies the eras as enumerated |
| | | 22 | | // integers where the current era (CurrentEra) has the value zero. |
| | | 23 | | // |
| | | 24 | | // For consistency, the first unit in each interval, e.g. the first month, is |
| | | 25 | | // assigned the value one. |
| | | 26 | | // The calculation of hour/minute/second is moved to Calendar from GregorianCalendar, |
| | | 27 | | // since most of the calendars (or all?) have the same way of calculating hour/minute/second. |
| | | 28 | | |
| | | 29 | | public abstract class Calendar : ICloneable |
| | | 30 | | { |
| | | 31 | | internal const long MaxMillis = (long)DateTime.DaysTo10000 * TimeSpan.MillisecondsPerDay; |
| | | 32 | | |
| | 0 | 33 | | private int _currentEraValue = -1; |
| | | 34 | | |
| | | 35 | | private bool _isReadOnly; |
| | | 36 | | |
| | 0 | 37 | | public virtual DateTime MinSupportedDateTime => DateTime.MinValue; |
| | | 38 | | |
| | 0 | 39 | | public virtual DateTime MaxSupportedDateTime => DateTime.MaxValue; |
| | | 40 | | |
| | 0 | 41 | | public virtual CalendarAlgorithmType AlgorithmType => CalendarAlgorithmType.Unknown; |
| | | 42 | | |
| | 0 | 43 | | protected Calendar() |
| | | 44 | | { |
| | 0 | 45 | | } |
| | | 46 | | |
| | 0 | 47 | | internal virtual CalendarId ID => CalendarId.UNINITIALIZED_VALUE; |
| | | 48 | | |
| | | 49 | | // Return the Base calendar ID for calendars that didn't have defined data in calendarData |
| | 0 | 50 | | internal virtual CalendarId BaseCalendarID => ID; |
| | | 51 | | |
| | 0 | 52 | | public bool IsReadOnly => _isReadOnly; |
| | | 53 | | |
| | | 54 | | public virtual object Clone() |
| | | 55 | | { |
| | 0 | 56 | | object o = MemberwiseClone(); |
| | 0 | 57 | | ((Calendar)o).SetReadOnlyState(false); |
| | 0 | 58 | | return o; |
| | | 59 | | } |
| | | 60 | | |
| | | 61 | | public static Calendar ReadOnly(Calendar calendar) |
| | | 62 | | { |
| | 0 | 63 | | ArgumentNullException.ThrowIfNull(calendar); |
| | | 64 | | |
| | 0 | 65 | | if (calendar.IsReadOnly) |
| | | 66 | | { |
| | 0 | 67 | | return calendar; |
| | | 68 | | } |
| | | 69 | | |
| | 0 | 70 | | Calendar clonedCalendar = (Calendar)(calendar.MemberwiseClone()); |
| | 0 | 71 | | clonedCalendar.SetReadOnlyState(true); |
| | 0 | 72 | | return clonedCalendar; |
| | | 73 | | } |
| | | 74 | | |
| | | 75 | | internal void VerifyWritable() |
| | | 76 | | { |
| | 0 | 77 | | if (_isReadOnly) |
| | | 78 | | { |
| | 0 | 79 | | throw new InvalidOperationException(SR.InvalidOperation_ReadOnly); |
| | | 80 | | } |
| | 0 | 81 | | } |
| | | 82 | | |
| | | 83 | | internal void SetReadOnlyState(bool readOnly) |
| | | 84 | | { |
| | 0 | 85 | | _isReadOnly = readOnly; |
| | 0 | 86 | | } |
| | | 87 | | |
| | | 88 | | /// <summary> |
| | | 89 | | /// This is used to convert CurrentEra(0) to an appropriate era value. |
| | | 90 | | /// </summary> |
| | | 91 | | internal int CurrentEraValue |
| | | 92 | | { |
| | | 93 | | get |
| | | 94 | | { |
| | | 95 | | // The following code assumes that the current era value can not be -1. |
| | 0 | 96 | | if (_currentEraValue == -1) |
| | | 97 | | { |
| | 0 | 98 | | Debug.Assert(BaseCalendarID != CalendarId.UNINITIALIZED_VALUE, "[Calendar.CurrentEraValue] Expected |
| | 0 | 99 | | _currentEraValue = CalendarData.GetCalendarCurrentEra(this); |
| | | 100 | | } |
| | | 101 | | |
| | 0 | 102 | | return _currentEraValue; |
| | | 103 | | } |
| | | 104 | | } |
| | | 105 | | |
| | | 106 | | public const int CurrentEra = 0; |
| | | 107 | | |
| | 0 | 108 | | internal int _twoDigitYearMax = -1; |
| | | 109 | | |
| | | 110 | | internal static void CheckAddResult(long ticks, DateTime minValue, DateTime maxValue) |
| | | 111 | | { |
| | 0 | 112 | | if (ticks < minValue.Ticks || ticks > maxValue.Ticks) |
| | | 113 | | { |
| | 0 | 114 | | throw new ArgumentException(SR.Format(SR.Argument_ResultCalendarRange, minValue, maxValue)); |
| | | 115 | | } |
| | 0 | 116 | | } |
| | | 117 | | |
| | | 118 | | internal DateTime Add(DateTime time, double value, int scale) |
| | | 119 | | { |
| | | 120 | | // From ECMA CLI spec, Partition III, section 3.27: |
| | | 121 | | // |
| | | 122 | | // If overflow occurs converting a floating-point type to an integer, or if the floating-point value |
| | | 123 | | // being converted to an integer is a NaN, the value returned is unspecified. |
| | | 124 | | // |
| | | 125 | | // Based upon this, this method should be performing the comparison against the double |
| | | 126 | | // before attempting a cast. Otherwise, the result is undefined. |
| | 0 | 127 | | double tempMillis = (value * scale + (value >= 0 ? 0.5 : -0.5)); |
| | 0 | 128 | | if (!((tempMillis > -(double)MaxMillis) && (tempMillis < (double)MaxMillis))) |
| | | 129 | | { |
| | 0 | 130 | | throw new ArgumentOutOfRangeException(nameof(value), value, SR.ArgumentOutOfRange_AddValue); |
| | | 131 | | } |
| | | 132 | | |
| | 0 | 133 | | long millis = (long)tempMillis; |
| | 0 | 134 | | long ticks = time.Ticks + millis * TimeSpan.TicksPerMillisecond; |
| | 0 | 135 | | CheckAddResult(ticks, MinSupportedDateTime, MaxSupportedDateTime); |
| | 0 | 136 | | return new DateTime(ticks); |
| | | 137 | | } |
| | | 138 | | |
| | | 139 | | /// <summary> |
| | | 140 | | /// Returns the DateTime resulting from adding the given number of |
| | | 141 | | /// milliseconds to the specified DateTime. The result is computed by rounding |
| | | 142 | | /// the number of milliseconds given by value to the nearest integer, |
| | | 143 | | /// and adding that interval to the specified DateTime. The value |
| | | 144 | | /// argument is permitted to be negative. |
| | | 145 | | /// </summary> |
| | | 146 | | public virtual DateTime AddMilliseconds(DateTime time, double milliseconds) |
| | | 147 | | { |
| | 0 | 148 | | return Add(time, milliseconds, 1); |
| | | 149 | | } |
| | | 150 | | |
| | | 151 | | /// <summary> |
| | | 152 | | /// Returns the DateTime resulting from adding a fractional number of |
| | | 153 | | /// days to the specified DateTime. The result is computed by rounding the |
| | | 154 | | /// fractional number of days given by value to the nearest |
| | | 155 | | /// millisecond, and adding that interval to the specified DateTime. The |
| | | 156 | | /// value argument is permitted to be negative. |
| | | 157 | | /// </summary> |
| | | 158 | | public virtual DateTime AddDays(DateTime time, int days) |
| | | 159 | | { |
| | 0 | 160 | | return Add(time, days, (int)TimeSpan.MillisecondsPerDay); |
| | | 161 | | } |
| | | 162 | | |
| | | 163 | | /// <summary> |
| | | 164 | | /// Returns the DateTime resulting from adding a fractional number of |
| | | 165 | | /// hours to the specified DateTime. The result is computed by rounding the |
| | | 166 | | /// fractional number of hours given by value to the nearest |
| | | 167 | | /// millisecond, and adding that interval to the specified DateTime. The |
| | | 168 | | /// value argument is permitted to be negative. |
| | | 169 | | /// </summary> |
| | | 170 | | public virtual DateTime AddHours(DateTime time, int hours) |
| | | 171 | | { |
| | 0 | 172 | | return Add(time, hours, (int)TimeSpan.MillisecondsPerHour); |
| | | 173 | | } |
| | | 174 | | |
| | | 175 | | /// <summary> |
| | | 176 | | /// Returns the DateTime resulting from adding a fractional number of |
| | | 177 | | /// minutes to the specified DateTime. The result is computed by rounding the |
| | | 178 | | /// fractional number of minutes given by value to the nearest |
| | | 179 | | /// millisecond, and adding that interval to the specified DateTime. The |
| | | 180 | | /// value argument is permitted to be negative. |
| | | 181 | | /// </summary> |
| | | 182 | | public virtual DateTime AddMinutes(DateTime time, int minutes) |
| | | 183 | | { |
| | 0 | 184 | | return Add(time, minutes, (int)TimeSpan.MillisecondsPerMinute); |
| | | 185 | | } |
| | | 186 | | |
| | | 187 | | /// <summary> |
| | | 188 | | /// Returns the DateTime resulting from adding the given number of |
| | | 189 | | /// months to the specified DateTime. The result is computed by incrementing |
| | | 190 | | /// (or decrementing) the year and month parts of the specified DateTime by |
| | | 191 | | /// value months, and, if required, adjusting the day part of the |
| | | 192 | | /// resulting date downwards to the last day of the resulting month in the |
| | | 193 | | /// resulting year. The time-of-day part of the result is the same as the |
| | | 194 | | /// time-of-day part of the specified DateTime. |
| | | 195 | | /// |
| | | 196 | | /// In more precise terms, considering the specified DateTime to be of the |
| | | 197 | | /// form y / m / d + t, where y is the |
| | | 198 | | /// year, m is the month, d is the day, and t is the |
| | | 199 | | /// time-of-day, the result is y1 / m1 / d1 + t, |
| | | 200 | | /// where y1 and m1 are computed by adding value months |
| | | 201 | | /// to y and m, and d1 is the largest value less than |
| | | 202 | | /// or equal to d that denotes a valid day in month m1 of year |
| | | 203 | | /// y1. |
| | | 204 | | /// </summary> |
| | | 205 | | public abstract DateTime AddMonths(DateTime time, int months); |
| | | 206 | | |
| | | 207 | | /// <summary> |
| | | 208 | | /// Returns the DateTime resulting from adding a number of |
| | | 209 | | /// seconds to the specified DateTime. The result is computed by rounding the |
| | | 210 | | /// fractional number of seconds given by value to the nearest |
| | | 211 | | /// millisecond, and adding that interval to the specified DateTime. The |
| | | 212 | | /// value argument is permitted to be negative. |
| | | 213 | | /// </summary> |
| | | 214 | | public virtual DateTime AddSeconds(DateTime time, int seconds) |
| | | 215 | | { |
| | 0 | 216 | | return Add(time, seconds, (int)TimeSpan.MillisecondsPerSecond); |
| | | 217 | | } |
| | | 218 | | |
| | | 219 | | // Returns the DateTime resulting from adding a number of |
| | | 220 | | // weeks to the specified DateTime. The |
| | | 221 | | // value argument is permitted to be negative. |
| | | 222 | | public virtual DateTime AddWeeks(DateTime time, int weeks) |
| | | 223 | | { |
| | 0 | 224 | | return AddDays(time, weeks * 7); |
| | | 225 | | } |
| | | 226 | | |
| | | 227 | | /// <summary> |
| | | 228 | | /// Returns the DateTime resulting from adding the given number of |
| | | 229 | | /// years to the specified DateTime. The result is computed by incrementing |
| | | 230 | | /// (or decrementing) the year part of the specified DateTime by value |
| | | 231 | | /// years. If the month and day of the specified DateTime is 2/29, and if the |
| | | 232 | | /// resulting year is not a leap year, the month and day of the resulting |
| | | 233 | | /// DateTime becomes 2/28. Otherwise, the month, day, and time-of-day |
| | | 234 | | /// parts of the result are the same as those of the specified DateTime. |
| | | 235 | | /// </summary> |
| | | 236 | | public abstract DateTime AddYears(DateTime time, int years); |
| | | 237 | | |
| | | 238 | | /// <summary> |
| | | 239 | | /// Returns the day-of-month part of the specified DateTime. The returned |
| | | 240 | | /// value is an integer between 1 and 31. |
| | | 241 | | /// </summary> |
| | | 242 | | public abstract int GetDayOfMonth(DateTime time); |
| | | 243 | | |
| | | 244 | | /// <summary> |
| | | 245 | | /// Returns the day-of-week part of the specified DateTime. The returned value |
| | | 246 | | /// is an integer between 0 and 6, where 0 indicates Sunday, 1 indicates |
| | | 247 | | /// Monday, 2 indicates Tuesday, 3 indicates Wednesday, 4 indicates |
| | | 248 | | /// Thursday, 5 indicates Friday, and 6 indicates Saturday. |
| | | 249 | | /// </summary> |
| | | 250 | | public abstract DayOfWeek GetDayOfWeek(DateTime time); |
| | | 251 | | |
| | | 252 | | /// <summary> |
| | | 253 | | /// Returns the day-of-year part of the specified DateTime. The returned value |
| | | 254 | | /// is an integer between 1 and 366. |
| | | 255 | | /// </summary> |
| | | 256 | | public abstract int GetDayOfYear(DateTime time); |
| | | 257 | | |
| | | 258 | | /// <summary> |
| | | 259 | | /// Returns the number of days in the month given by the year and |
| | | 260 | | /// month arguments. |
| | | 261 | | /// </summary> |
| | | 262 | | public virtual int GetDaysInMonth(int year, int month) |
| | | 263 | | { |
| | 0 | 264 | | return GetDaysInMonth(year, month, CurrentEra); |
| | | 265 | | } |
| | | 266 | | |
| | | 267 | | /// <summary> |
| | | 268 | | /// Returns the number of days in the month given by the year and |
| | | 269 | | /// month arguments for the specified era. |
| | | 270 | | /// </summary> |
| | | 271 | | public abstract int GetDaysInMonth(int year, int month, int era); |
| | | 272 | | |
| | | 273 | | /// <summary> |
| | | 274 | | /// Returns the number of days in the year given by the year argument |
| | | 275 | | /// for the current era. |
| | | 276 | | /// </summary> |
| | | 277 | | public virtual int GetDaysInYear(int year) |
| | | 278 | | { |
| | 0 | 279 | | return GetDaysInYear(year, CurrentEra); |
| | | 280 | | } |
| | | 281 | | |
| | | 282 | | /// <summary> |
| | | 283 | | /// Returns the number of days in the year given by the year argument |
| | | 284 | | /// for the current era. |
| | | 285 | | /// </summary> |
| | | 286 | | public abstract int GetDaysInYear(int year, int era); |
| | | 287 | | |
| | | 288 | | /// <summary> |
| | | 289 | | /// Returns the era for the specified DateTime value. |
| | | 290 | | /// </summary> |
| | | 291 | | public abstract int GetEra(DateTime time); |
| | | 292 | | |
| | | 293 | | /// <summary> |
| | | 294 | | /// Get the list of era values. |
| | | 295 | | /// </summary> |
| | | 296 | | /// <returns>The int array of the era names supported in this calendar or null if era is not used.</returns> |
| | | 297 | | public abstract int[] Eras { get; } |
| | | 298 | | |
| | | 299 | | // Returns the hour part of the specified DateTime. The returned value is an |
| | | 300 | | // integer between 0 and 23. |
| | 0 | 301 | | public virtual int GetHour(DateTime time) => time.Hour; |
| | | 302 | | |
| | | 303 | | // Returns the millisecond part of the specified DateTime. The returned value |
| | | 304 | | // is an integer between 0 and 999. |
| | 0 | 305 | | public virtual double GetMilliseconds(DateTime time) => time.Millisecond; |
| | | 306 | | |
| | | 307 | | // Returns the minute part of the specified DateTime. The returned value is |
| | | 308 | | // an integer between 0 and 59. |
| | 0 | 309 | | public virtual int GetMinute(DateTime time) => time.Minute; |
| | | 310 | | |
| | | 311 | | // Returns the month part of the specified DateTime. The returned value is an |
| | | 312 | | // integer between 1 and 12. |
| | | 313 | | public abstract int GetMonth(DateTime time); |
| | | 314 | | |
| | | 315 | | // Returns the number of months in the specified year in the current era. |
| | | 316 | | public virtual int GetMonthsInYear(int year) |
| | | 317 | | { |
| | 0 | 318 | | return GetMonthsInYear(year, CurrentEra); |
| | | 319 | | } |
| | | 320 | | |
| | | 321 | | // Returns the number of months in the specified year and era. |
| | | 322 | | public abstract int GetMonthsInYear(int year, int era); |
| | | 323 | | |
| | | 324 | | // Returns the second part of the specified DateTime. The returned value is |
| | | 325 | | // an integer between 0 and 59. |
| | 0 | 326 | | public virtual int GetSecond(DateTime time) => time.Second; |
| | | 327 | | |
| | | 328 | | /// <summary> |
| | | 329 | | /// Get the week of year using the FirstDay rule. |
| | | 330 | | /// </summary> |
| | | 331 | | /// <remarks> |
| | | 332 | | /// The CalendarWeekRule.FirstDay rule: Week 1 begins on the first day of the year. |
| | | 333 | | /// Assume f is the specified firstDayOfWeek, |
| | | 334 | | /// and n is the day of week for January 1 of the specified year. |
| | | 335 | | /// Assign offset = n - f; |
| | | 336 | | /// Case 1: offset = 0 |
| | | 337 | | /// E.g. |
| | | 338 | | /// f=1 |
| | | 339 | | /// weekday 0 1 2 3 4 5 6 0 1 |
| | | 340 | | /// date 1/1 |
| | | 341 | | /// week# 1 2 |
| | | 342 | | /// then week of year = (GetDayOfYear(time) - 1) / 7 + 1 |
| | | 343 | | /// |
| | | 344 | | /// Case 2: offset < 0 |
| | | 345 | | /// e.g. |
| | | 346 | | /// n=1 f=3 |
| | | 347 | | /// weekday 0 1 2 3 4 5 6 0 |
| | | 348 | | /// date 1/1 |
| | | 349 | | /// week# 1 2 |
| | | 350 | | /// This means that the first week actually starts 5 days before 1/1. |
| | | 351 | | /// So week of year = (GetDayOfYear(time) + (7 + offset) - 1) / 7 + 1 |
| | | 352 | | /// Case 3: offset > 0 |
| | | 353 | | /// e.g. |
| | | 354 | | /// f=0 n=2 |
| | | 355 | | /// weekday 0 1 2 3 4 5 6 0 1 2 |
| | | 356 | | /// date 1/1 |
| | | 357 | | /// week# 1 2 |
| | | 358 | | /// This means that the first week actually starts 2 days before 1/1. |
| | | 359 | | /// So Week of year = (GetDayOfYear(time) + offset - 1) / 7 + 1 |
| | | 360 | | /// </remarks> |
| | | 361 | | internal int GetFirstDayWeekOfYear(DateTime time, int firstDayOfWeek) |
| | | 362 | | { |
| | 0 | 363 | | int dayOfYear = GetDayOfYear(time) - 1; // Make the day of year to be 0-based, so that 1/1 is day 0. |
| | | 364 | | // Calculate the day of week for the first day of the year. |
| | | 365 | | // dayOfWeek - (dayOfYear % 7) is the day of week for the first day of this year. Note that |
| | | 366 | | // this value can be less than 0. It's fine since we are making it positive again in calculating offset. |
| | 0 | 367 | | int dayForJan1 = (int)GetDayOfWeek(time) - (dayOfYear % 7); |
| | 0 | 368 | | int offset = (dayForJan1 - firstDayOfWeek + 14) % 7; |
| | 0 | 369 | | Debug.Assert(offset >= 0, "Calendar.GetFirstDayWeekOfYear(): offset >= 0"); |
| | 0 | 370 | | return (dayOfYear + offset) / 7 + 1; |
| | | 371 | | } |
| | | 372 | | |
| | | 373 | | private int GetWeekOfYearFullDays(DateTime time, int firstDayOfWeek, int fullDays) |
| | | 374 | | { |
| | | 375 | | int dayForJan1; |
| | | 376 | | int offset; |
| | | 377 | | int day; |
| | | 378 | | |
| | 0 | 379 | | int dayOfYear = GetDayOfYear(time) - 1; // Make the day of year to be 0-based, so that 1/1 is day 0. |
| | | 380 | | |
| | | 381 | | // Calculate the number of days between the first day of year (1/1) and the first day of the week. |
| | | 382 | | // This value will be a positive value from 0 ~ 6. We call this value as "offset". |
| | | 383 | | // |
| | | 384 | | // If offset is 0, it means that the 1/1 is the start of the first week. |
| | | 385 | | // Assume the first day of the week is Monday, it will look like this: |
| | | 386 | | // Sun Mon Tue Wed Thu Fri Sat |
| | | 387 | | // 12/31 1/1 1/2 1/3 1/4 1/5 1/6 |
| | | 388 | | // +--> First week starts here. |
| | | 389 | | // |
| | | 390 | | // If offset is 1, it means that the first day of the week is 1 day ahead of 1/1. |
| | | 391 | | // Assume the first day of the week is Monday, it will look like this: |
| | | 392 | | // Sun Mon Tue Wed Thu Fri Sat |
| | | 393 | | // 1/1 1/2 1/3 1/4 1/5 1/6 1/7 |
| | | 394 | | // +--> First week starts here. |
| | | 395 | | // |
| | | 396 | | // If offset is 2, it means that the first day of the week is 2 days ahead of 1/1. |
| | | 397 | | // Assume the first day of the week is Monday, it will look like this: |
| | | 398 | | // Sat Sun Mon Tue Wed Thu Fri Sat |
| | | 399 | | // 1/1 1/2 1/3 1/4 1/5 1/6 1/7 1/8 |
| | | 400 | | // +--> First week starts here. |
| | | 401 | | |
| | | 402 | | // Day of week is 0-based. |
| | | 403 | | // Get the day of week for 1/1. This can be derived from the day of week of the target day. |
| | | 404 | | // Note that we can get a negative value. It's ok since we are going to make it a positive value when calcu |
| | 0 | 405 | | dayForJan1 = (int)GetDayOfWeek(time) - (dayOfYear % 7); |
| | | 406 | | |
| | | 407 | | // Now, calculate the offset. Subtract the first day of week from the dayForJan1. And make it a positive v |
| | 0 | 408 | | offset = (firstDayOfWeek - dayForJan1 + 14) % 7; |
| | 0 | 409 | | if (offset != 0 && offset >= fullDays) |
| | | 410 | | { |
| | | 411 | | // If the offset is greater than the value of fullDays, it means that |
| | | 412 | | // the first week of the year starts on the week where Jan/1 falls on. |
| | 0 | 413 | | offset -= 7; |
| | | 414 | | } |
| | | 415 | | |
| | | 416 | | // Calculate the day of year for specified time by taking offset into account. |
| | 0 | 417 | | day = dayOfYear - offset; |
| | 0 | 418 | | if (day >= 0) |
| | | 419 | | { |
| | | 420 | | // If the day of year value is greater than zero, get the week of year. |
| | 0 | 421 | | return day / 7 + 1; |
| | | 422 | | } |
| | | 423 | | |
| | | 424 | | // Otherwise, the specified time falls on the week of previous year. |
| | | 425 | | // Call this method again by passing the last day of previous year. |
| | | 426 | | // the last day of the previous year may "underflow" to no longer be a valid date time for |
| | | 427 | | // this calendar if we just subtract so we need the subclass to provide us with |
| | | 428 | | // that information |
| | 0 | 429 | | if (time <= MinSupportedDateTime.AddDays(dayOfYear)) |
| | | 430 | | { |
| | 0 | 431 | | return GetWeekOfYearOfMinSupportedDateTime(firstDayOfWeek, fullDays); |
| | | 432 | | } |
| | | 433 | | |
| | 0 | 434 | | return GetWeekOfYearFullDays(time.AddDays(-(dayOfYear + 1)), firstDayOfWeek, fullDays); |
| | | 435 | | } |
| | | 436 | | |
| | | 437 | | private int GetWeekOfYearOfMinSupportedDateTime(int firstDayOfWeek, int minimumDaysInFirstWeek) |
| | | 438 | | { |
| | 0 | 439 | | int dayOfYear = GetDayOfYear(MinSupportedDateTime) - 1; // Make the day of year to be 0-based, so that 1/1 |
| | 0 | 440 | | int dayOfWeekOfFirstOfYear = (int)GetDayOfWeek(MinSupportedDateTime) - dayOfYear % 7; |
| | | 441 | | |
| | | 442 | | // Calculate the offset (how many days from the start of the year to the start of the week) |
| | 0 | 443 | | int offset = (firstDayOfWeek + 7 - dayOfWeekOfFirstOfYear) % 7; |
| | 0 | 444 | | if (offset == 0 || offset >= minimumDaysInFirstWeek) |
| | | 445 | | { |
| | | 446 | | // First of year falls in the first week of the year |
| | 0 | 447 | | return 1; |
| | | 448 | | } |
| | | 449 | | |
| | 0 | 450 | | int daysInYearBeforeMinSupportedYear = DaysInYearBeforeMinSupportedYear - 1; // Make the day of year to be 0 |
| | 0 | 451 | | int dayOfWeekOfFirstOfPreviousYear = dayOfWeekOfFirstOfYear - 1 - (daysInYearBeforeMinSupportedYear % 7); |
| | | 452 | | |
| | | 453 | | // starting from first day of the year, how many days do you have to go forward |
| | | 454 | | // before getting to the first day of the week? |
| | 0 | 455 | | int daysInInitialPartialWeek = (firstDayOfWeek - dayOfWeekOfFirstOfPreviousYear + 14) % 7; |
| | 0 | 456 | | int day = daysInYearBeforeMinSupportedYear - daysInInitialPartialWeek; |
| | 0 | 457 | | if (daysInInitialPartialWeek >= minimumDaysInFirstWeek) |
| | | 458 | | { |
| | | 459 | | // If the offset is greater than the minimum Days in the first week, it means that |
| | | 460 | | // First of year is part of the first week of the year even though it is only a partial week |
| | | 461 | | // add another week |
| | 0 | 462 | | day += 7; |
| | | 463 | | } |
| | | 464 | | |
| | 0 | 465 | | return day / 7 + 1; |
| | | 466 | | } |
| | | 467 | | |
| | 0 | 468 | | protected virtual int DaysInYearBeforeMinSupportedYear => 365; |
| | | 469 | | |
| | | 470 | | /// <summary> |
| | | 471 | | /// Returns the week of year for the specified DateTime. The returned value is an |
| | | 472 | | /// integer between 1 and 53. |
| | | 473 | | /// </summary> |
| | | 474 | | public virtual int GetWeekOfYear(DateTime time, CalendarWeekRule rule, DayOfWeek firstDayOfWeek) |
| | | 475 | | { |
| | 0 | 476 | | if (firstDayOfWeek < DayOfWeek.Sunday || firstDayOfWeek > DayOfWeek.Saturday) |
| | | 477 | | { |
| | 0 | 478 | | throw new ArgumentOutOfRangeException( |
| | 0 | 479 | | nameof(firstDayOfWeek), |
| | 0 | 480 | | firstDayOfWeek, |
| | 0 | 481 | | SR.Format(SR.ArgumentOutOfRange_Range, DayOfWeek.Sunday, DayOfWeek.Saturday)); |
| | | 482 | | } |
| | | 483 | | |
| | 0 | 484 | | return rule switch |
| | 0 | 485 | | { |
| | 0 | 486 | | CalendarWeekRule.FirstDay => GetFirstDayWeekOfYear(time, (int)firstDayOfWeek), |
| | 0 | 487 | | CalendarWeekRule.FirstFullWeek => GetWeekOfYearFullDays(time, (int)firstDayOfWeek, 7), |
| | 0 | 488 | | CalendarWeekRule.FirstFourDayWeek => GetWeekOfYearFullDays(time, (int)firstDayOfWeek, 4), |
| | 0 | 489 | | _ => throw new ArgumentOutOfRangeException( |
| | 0 | 490 | | nameof(rule), |
| | 0 | 491 | | rule, |
| | 0 | 492 | | SR.Format(SR.ArgumentOutOfRange_Range, CalendarWeekRule.FirstDay, CalendarWeekRule.FirstFourDayW |
| | 0 | 493 | | }; |
| | | 494 | | } |
| | | 495 | | |
| | | 496 | | /// <summary> |
| | | 497 | | /// Returns the year part of the specified DateTime. The returned value is an |
| | | 498 | | /// integer between 1 and 9999. |
| | | 499 | | /// </summary> |
| | | 500 | | public abstract int GetYear(DateTime time); |
| | | 501 | | |
| | | 502 | | /// <summary> |
| | | 503 | | /// Checks whether a given day in the current era is a leap day. |
| | | 504 | | /// This method returns true if the date is a leap day, or false if not. |
| | | 505 | | /// </summary> |
| | | 506 | | public virtual bool IsLeapDay(int year, int month, int day) |
| | | 507 | | { |
| | 0 | 508 | | return IsLeapDay(year, month, day, CurrentEra); |
| | | 509 | | } |
| | | 510 | | |
| | | 511 | | /// <summary> |
| | | 512 | | /// Checks whether a given day in the specified era is a leap day. |
| | | 513 | | /// This method returns true if the date is a leap day, or false if not. |
| | | 514 | | /// </summary> |
| | | 515 | | public abstract bool IsLeapDay(int year, int month, int day, int era); |
| | | 516 | | |
| | | 517 | | /// <summary> |
| | | 518 | | /// Checks whether a given month in the current era is a leap month. |
| | | 519 | | /// This method returns true if month is a leap month, or false if not. |
| | | 520 | | /// </summary> |
| | | 521 | | public virtual bool IsLeapMonth(int year, int month) |
| | | 522 | | { |
| | 0 | 523 | | return IsLeapMonth(year, month, CurrentEra); |
| | | 524 | | } |
| | | 525 | | |
| | | 526 | | /// <summary> |
| | | 527 | | /// Checks whether a given month in the specified era is a leap month. This method returns true if |
| | | 528 | | /// month is a leap month, or false if not. |
| | | 529 | | /// </summary> |
| | | 530 | | public abstract bool IsLeapMonth(int year, int month, int era); |
| | | 531 | | |
| | | 532 | | /// <summary> |
| | | 533 | | /// Returns the leap month in a calendar year of the current era. |
| | | 534 | | /// This method returns 0 if this calendar does not have leap month, |
| | | 535 | | /// or this year is not a leap year. |
| | | 536 | | /// </summary> |
| | | 537 | | public virtual int GetLeapMonth(int year) |
| | | 538 | | { |
| | 0 | 539 | | return GetLeapMonth(year, CurrentEra); |
| | | 540 | | } |
| | | 541 | | |
| | | 542 | | /// <summary> |
| | | 543 | | /// Returns the leap month in a calendar year of the specified era. |
| | | 544 | | /// This method returns 0 if this calendar does not have leap month, |
| | | 545 | | /// or this year is not a leap year. |
| | | 546 | | /// </summary> |
| | | 547 | | public virtual int GetLeapMonth(int year, int era) |
| | | 548 | | { |
| | 0 | 549 | | if (!IsLeapYear(year, era)) |
| | | 550 | | { |
| | 0 | 551 | | return 0; |
| | | 552 | | } |
| | | 553 | | |
| | 0 | 554 | | int monthsCount = GetMonthsInYear(year, era); |
| | 0 | 555 | | for (int month = 1; month <= monthsCount; month++) |
| | | 556 | | { |
| | 0 | 557 | | if (IsLeapMonth(year, month, era)) |
| | | 558 | | { |
| | 0 | 559 | | return month; |
| | | 560 | | } |
| | | 561 | | } |
| | | 562 | | |
| | 0 | 563 | | return 0; |
| | | 564 | | } |
| | | 565 | | |
| | | 566 | | /// <summary> |
| | | 567 | | /// Checks whether a given year in the current era is a leap year. |
| | | 568 | | /// This method returns true if year is a leap year, or false if not. |
| | | 569 | | /// </summary> |
| | | 570 | | public virtual bool IsLeapYear(int year) |
| | | 571 | | { |
| | 0 | 572 | | return IsLeapYear(year, CurrentEra); |
| | | 573 | | } |
| | | 574 | | |
| | | 575 | | /// <summary> |
| | | 576 | | /// Checks whether a given year in the specified era is a leap year. |
| | | 577 | | /// This method returns true if year is a leap year, or false if not. |
| | | 578 | | /// </summary> |
| | | 579 | | public abstract bool IsLeapYear(int year, int era); |
| | | 580 | | |
| | | 581 | | /// <summary> |
| | | 582 | | /// Returns the date and time converted to a DateTime value. |
| | | 583 | | /// Throws an exception if the n-tuple is invalid. |
| | | 584 | | /// </summary> |
| | | 585 | | public virtual DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int milliseco |
| | | 586 | | { |
| | 0 | 587 | | return ToDateTime(year, month, day, hour, minute, second, millisecond, CurrentEra); |
| | | 588 | | } |
| | | 589 | | |
| | | 590 | | /// <summary> |
| | | 591 | | /// Returns the date and time converted to a DateTime value. |
| | | 592 | | /// Throws an exception if the n-tuple is invalid. |
| | | 593 | | /// </summary> |
| | | 594 | | public abstract DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisec |
| | | 595 | | |
| | | 596 | | internal virtual bool TryToDateTime(int year, int month, int day, int hour, int minute, int second, int millisec |
| | | 597 | | { |
| | 0 | 598 | | result = DateTime.MinValue; |
| | | 599 | | try |
| | | 600 | | { |
| | 0 | 601 | | result = ToDateTime(year, month, day, hour, minute, second, millisecond, era); |
| | 0 | 602 | | return true; |
| | | 603 | | } |
| | 0 | 604 | | catch (ArgumentException) |
| | | 605 | | { |
| | 0 | 606 | | return false; |
| | | 607 | | } |
| | 0 | 608 | | } |
| | | 609 | | |
| | | 610 | | internal virtual bool IsValidYear(int year, int era) |
| | | 611 | | { |
| | 0 | 612 | | return year >= GetYear(MinSupportedDateTime) && year <= GetYear(MaxSupportedDateTime); |
| | | 613 | | } |
| | | 614 | | |
| | | 615 | | internal virtual bool IsValidMonth(int year, int month, int era) |
| | | 616 | | { |
| | 0 | 617 | | return IsValidYear(year, era) && month >= 1 && month <= GetMonthsInYear(year, era); |
| | | 618 | | } |
| | | 619 | | |
| | | 620 | | internal virtual bool IsValidDay(int year, int month, int day, int era) |
| | | 621 | | { |
| | 0 | 622 | | return IsValidMonth(year, month, era) && day >= 1 && day <= GetDaysInMonth(year, month, era); |
| | | 623 | | } |
| | | 624 | | |
| | | 625 | | /// <summary> |
| | | 626 | | /// Returns and assigns the maximum value to represent a two digit year. |
| | | 627 | | /// This value is the upper boundary of a 100 year range that allows a |
| | | 628 | | /// two digit year to be properly translated to a four digit year. |
| | | 629 | | /// For example, if 2049 is the upper boundary, then a two digit value of |
| | | 630 | | /// 30 should be interpreted as 1950 while a two digit value of 49 should |
| | | 631 | | /// be interpreted as 2049. In this example, the 100 year range would be |
| | | 632 | | /// from 1950-2049. See ToFourDigitYear(). |
| | | 633 | | /// </summary> |
| | | 634 | | public virtual int TwoDigitYearMax |
| | | 635 | | { |
| | 0 | 636 | | get => _twoDigitYearMax; |
| | | 637 | | set |
| | | 638 | | { |
| | 0 | 639 | | VerifyWritable(); |
| | 0 | 640 | | _twoDigitYearMax = value; |
| | 0 | 641 | | } |
| | | 642 | | } |
| | | 643 | | |
| | | 644 | | /// <summary> |
| | | 645 | | /// Converts the year value to the appropriate century by using the |
| | | 646 | | /// TwoDigitYearMax property. For example, if the TwoDigitYearMax value is 2049, |
| | | 647 | | /// then a two digit value of 50 will get converted to 1950 while a two digit |
| | | 648 | | /// value of 49 will get converted to 2049. |
| | | 649 | | /// </summary> |
| | | 650 | | public virtual int ToFourDigitYear(int year) |
| | | 651 | | { |
| | 0 | 652 | | ArgumentOutOfRangeException.ThrowIfNegative(year); |
| | 0 | 653 | | if (year < 100) |
| | | 654 | | { |
| | 0 | 655 | | return (TwoDigitYearMax / 100 - (year > TwoDigitYearMax % 100 ? 1 : 0)) * 100 + year; |
| | | 656 | | } |
| | | 657 | | |
| | | 658 | | // If the year value is above 100, just return the year value. Don't have to do |
| | | 659 | | // the TwoDigitYearMax comparison. |
| | 0 | 660 | | return year; |
| | | 661 | | } |
| | | 662 | | |
| | | 663 | | /// <summary> |
| | | 664 | | /// Return the tick count corresponding to the given hour, minute, second. |
| | | 665 | | /// Will check the if the parameters are valid. |
| | | 666 | | /// </summary> |
| | | 667 | | internal static long TimeToTicks(int hour, int minute, int second, int millisecond) |
| | | 668 | | { |
| | 0 | 669 | | if ((uint)hour >= 24 || (uint)minute >= 60 || (uint)second >= 60) |
| | | 670 | | { |
| | 0 | 671 | | throw new ArgumentOutOfRangeException(null, SR.ArgumentOutOfRange_BadHourMinuteSecond); |
| | | 672 | | } |
| | 0 | 673 | | if ((uint)millisecond >= TimeSpan.MillisecondsPerSecond) |
| | | 674 | | { |
| | 0 | 675 | | throw new ArgumentOutOfRangeException( |
| | 0 | 676 | | nameof(millisecond), |
| | 0 | 677 | | millisecond, |
| | 0 | 678 | | SR.Format(SR.ArgumentOutOfRange_Range, 0, TimeSpan.MillisecondsPerSecond - 1)); |
| | | 679 | | } |
| | | 680 | | |
| | 0 | 681 | | int totalSeconds = hour * 3600 + minute * 60 + second; |
| | 0 | 682 | | return totalSeconds * TimeSpan.TicksPerSecond + millisecond * TimeSpan.TicksPerMillisecond; |
| | | 683 | | } |
| | | 684 | | |
| | | 685 | | internal static int GetSystemTwoDigitYearSetting(CalendarId CalID, int defaultYearValue) |
| | | 686 | | { |
| | 0 | 687 | | int twoDigitYearMax = CalendarData.GetTwoDigitYearMax(CalID); |
| | 0 | 688 | | return twoDigitYearMax >= 0 ? twoDigitYearMax : defaultYearValue; |
| | | 689 | | } |
| | | 690 | | } |
| | | 691 | | } |
| | | 692 | | |