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1 /*******************************************************************************
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2
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3 copyright: Copyright (c) 2005 John Chapman. All rights reserved
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4
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5 license: BSD style: $(LICENSE)
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6
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7 version: Mid 2005: Initial release
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8 Apr 2007: reshaped
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9
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10 author: John Chapman, Kris, schveiguy
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11
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12 ******************************************************************************/
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13
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14 module tango.time.chrono.Gregorian;
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15
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16 private import tango.time.chrono.Calendar;
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17
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18 /**
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19 * $(ANCHOR _Gregorian)
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20 * Represents the Gregorian calendar.
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21 *
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22 * Note that this is the Proleptic Gregorian calendar. Most calendars assume
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23 * that dates before 9/14/1752 were Julian Dates. Julian differs from
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24 * Gregorian in that leap years occur every 4 years, even on 100 year
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25 * increments. The Proleptic Gregorian calendar applies the Gregorian leap
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26 * year rules to dates before 9/14/1752, making the calculation of dates much
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27 * easier.
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28 */
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29 class Gregorian : Calendar
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30 {
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31 // import baseclass toTime()
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32 alias Calendar.toTime toTime;
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33
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34 /// static shared instance
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35 public static Gregorian generic;
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36
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37 enum Type
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38 {
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39 Localized = 1, /// Refers to the localized version of the Gregorian calendar.
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40 USEnglish = 2, /// Refers to the US English version of the Gregorian calendar.
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41 MiddleEastFrench = 9, /// Refers to the Middle East French version of the Gregorian calendar.
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42 Arabic = 10, /// Refers to the _Arabic version of the Gregorian calendar.
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43 TransliteratedEnglish = 11, /// Refers to the transliterated English version of the Gregorian calendar.
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44 TransliteratedFrench = 12 /// Refers to the transliterated French version of the Gregorian calendar.
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45 }
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46
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47 private Type type_;
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48
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49 /**
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50 * Represents the current era.
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51 */
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52 enum {AD_ERA = 1, BC_ERA = 2, MAX_YEAR = 9999};
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53
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54 private static final uint[] DaysToMonthCommon = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365];
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55
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56 private static final uint[] DaysToMonthLeap = [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366];
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57
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58 /**
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59 * create a generic instance of this calendar
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60 */
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61 static this()
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62 {
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63 generic = new Gregorian;
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64 }
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65
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66 /**
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67 * Initializes an instance of the Gregorian class using the specified GregorianTypes value. If no value is
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68 * specified, the default is Gregorian.Types.Localized.
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69 */
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70 this (Type type = Type.Localized)
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71 {
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72 type_ = type;
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73 }
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74
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75 /**
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76 * Overridden. Returns a Time value set to the specified date and time in the specified _era.
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77 * Params:
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78 * year = An integer representing the _year.
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79 * month = An integer representing the _month.
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80 * day = An integer representing the _day.
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81 * hour = An integer representing the _hour.
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82 * minute = An integer representing the _minute.
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83 * second = An integer representing the _second.
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84 * millisecond = An integer representing the _millisecond.
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85 * era = An integer representing the _era.
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86 * Returns: A Time set to the specified date and time.
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87 */
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88 override Time toTime (uint year, uint month, uint day, uint hour, uint minute, uint second, uint millisecond, uint era)
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89 {
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90 return Time (getDateTicks(year, month, day, era) + getTimeTicks(hour, minute, second)) + TimeSpan.millis(millisecond);
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91 }
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92
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93 /**
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94 * Overridden. Returns the day of the week in the specified Time.
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95 * Params: time = A Time value.
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96 * Returns: A DayOfWeek value representing the day of the week of time.
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97 */
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98 override DayOfWeek getDayOfWeek(Time time)
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99 {
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100 int dow;
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101 if(time.ticks < 0)
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102 {
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103 dow = ((time.ticks + 1) / TimeSpan.TicksPerDay) % 7;
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104 if(dow < 0)
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105 dow += 7;
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106 }
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107 else
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108 dow = (time.ticks / TimeSpan.TicksPerDay + 1) % 7;
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109 return cast(DayOfWeek)dow;
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110 }
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111
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112 /**
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113 * Overridden. Returns the day of the month in the specified Time.
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114 * Params: time = A Time value.
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115 * Returns: An integer representing the day of the month of time.
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116 */
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117 override uint getDayOfMonth(Time time)
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118 {
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119 return extractPart(time.ticks, DatePart.Day);
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120 }
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121
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122 /**
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123 * Overridden. Returns the day of the year in the specified Time.
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124 * Params: time = A Time value.
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125 * Returns: An integer representing the day of the year of time.
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126 */
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127 override uint getDayOfYear(Time time)
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128 {
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129 return extractPart(time.ticks, DatePart.DayOfYear);
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130 }
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131
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132 /**
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133 * Overridden. Returns the month in the specified Time.
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134 * Params: time = A Time value.
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135 * Returns: An integer representing the month in time.
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136 */
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137 override uint getMonth(Time time)
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138 {
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139 return extractPart(time.ticks, DatePart.Month);
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140 }
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141
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142 /**
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143 * Overridden. Returns the year in the specified Time.
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144 * Params: time = A Time value.
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145 * Returns: An integer representing the year in time.
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146 */
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147 override uint getYear(Time time)
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148 {
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149 return extractPart(time.ticks, DatePart.Year);
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150 }
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151
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152 /**
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153 * Overridden. Returns the era in the specified Time.
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154 * Params: time = A Time value.
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155 * Returns: An integer representing the era in time.
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156 */
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157 override uint getEra(Time time)
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158 {
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159 if(time < time.epoch)
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160 return BC_ERA;
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161 else
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162 return AD_ERA;
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163 }
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164
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165 /**
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166 * Overridden. Returns the number of days in the specified _year and _month of the specified _era.
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167 * Params:
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168 * year = An integer representing the _year.
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169 * month = An integer representing the _month.
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170 * era = An integer representing the _era.
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171 * Returns: The number of days in the specified _year and _month of the specified _era.
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172 */
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173 override uint getDaysInMonth(uint year, uint month, uint era)
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174 {
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175 auto monthDays = isLeapYear(year, era) ? DaysToMonthLeap : DaysToMonthCommon;
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176 return monthDays[month] - monthDays[month - 1];
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177 }
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178
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179 /**
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180 * Overridden. Returns the number of days in the specified _year of the specified _era.
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181 * Params:
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182 * year = An integer representing the _year.
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183 * era = An integer representing the _era.
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184 * Returns: The number of days in the specified _year in the specified _era.
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185 */
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186 override uint getDaysInYear(uint year, uint era)
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187 {
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188 return isLeapYear(year, era) ? 366 : 365;
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189 }
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190
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191 /**
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192 * Overridden. Returns the number of months in the specified _year of the specified _era.
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193 * Params:
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194 * year = An integer representing the _year.
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195 * era = An integer representing the _era.
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196 * Returns: The number of months in the specified _year in the specified _era.
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197 */
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198 override uint getMonthsInYear(uint year, uint era)
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199 {
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200 return 12;
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201 }
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202
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203 /**
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204 * Overridden. Indicates whether the specified _year in the specified _era is a leap _year.
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205 * Params: year = An integer representing the _year.
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206 * Params: era = An integer representing the _era.
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207 * Returns: true is the specified _year is a leap _year; otherwise, false.
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208 */
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209 override bool isLeapYear(uint year, uint era)
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210 {
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211 return staticIsLeapYear(year, era);
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212 }
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213
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214 /**
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215 * $(I Property.) Retrieves the GregorianTypes value indicating the language version of the Gregorian.
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216 * Returns: The Gregorian.Type value indicating the language version of the Gregorian.
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217 */
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218 Type calendarType()
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219 {
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220 return type_;
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221 }
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222
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223 /**
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224 * $(I Property.) Overridden. Retrieves the list of eras in the current calendar.
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225 * Returns: An integer array representing the eras in the current calendar.
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226 */
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227 override uint[] eras()
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228 {
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229 uint[] tmp = [AD_ERA, BC_ERA];
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230 return tmp.dup;
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231 }
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232
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233 /**
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234 * $(I Property.) Overridden. Retrieves the identifier associated with the current calendar.
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235 * Returns: An integer representing the identifier of the current calendar.
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236 */
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237 override uint id()
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238 {
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239 return cast(int) type_;
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240 }
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241
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242 override void split(Time time, ref uint year, ref uint month, ref uint day, ref uint doy, ref uint dow, ref uint era)
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243 {
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244 splitDate(time.ticks, year, month, day, doy, era);
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245 dow = getDayOfWeek(time);
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246 }
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247
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248 package static void splitDate (long ticks, ref uint year, ref uint month, ref uint day, ref uint dayOfYear, ref uint era)
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249 {
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250 int numDays;
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251
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252 void calculateYear()
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253 {
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254 auto whole400Years = numDays / cast(int) TimeSpan.DaysPer400Years;
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255 numDays -= whole400Years * cast(int) TimeSpan.DaysPer400Years;
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256 auto whole100Years = numDays / cast(int) TimeSpan.DaysPer100Years;
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257 if (whole100Years == 4)
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258 whole100Years = 3;
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259
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260 numDays -= whole100Years * cast(int) TimeSpan.DaysPer100Years;
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261 auto whole4Years = numDays / cast(int) TimeSpan.DaysPer4Years;
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262 numDays -= whole4Years * cast(int) TimeSpan.DaysPer4Years;
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263 auto wholeYears = numDays / cast(int) TimeSpan.DaysPerYear;
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264 if (wholeYears == 4)
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265 wholeYears = 3;
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266
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267 year = whole400Years * 400 + whole100Years * 100 + whole4Years * 4 + wholeYears + era;
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268 numDays -= wholeYears * TimeSpan.DaysPerYear;
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269 }
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270
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271 if(ticks < 0)
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272 {
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273 // in the BC era
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274 era = BC_ERA;
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275 //
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276 // set up numDays to be like AD. AD days start at
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277 // year 1. However, in BC, year 1 is like AD year 0,
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278 // so we must subtract one year.
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279 //
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280 numDays = cast(int)((-ticks - 1) / TimeSpan.TicksPerDay);
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281 if(numDays < 366)
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282 {
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283 // in the year 1 B.C. This is a special case
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284 // leap year
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285 year = 1;
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286 }
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287 else
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288 {
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289 numDays -= 366;
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290 calculateYear;
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291 }
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292 //
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293 // numDays is the number of days back from the end of
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294 // the year, because the original ticks were negative
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295 //
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296 numDays = (staticIsLeapYear(year, era) ? 366 : 365) - numDays - 1;
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297 }
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298 else
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299 {
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300 era = AD_ERA;
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301 numDays = cast(int)(ticks / TimeSpan.TicksPerDay);
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302 calculateYear;
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303 }
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304 dayOfYear = numDays + 1;
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305
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306 auto monthDays = staticIsLeapYear(year, era) ? DaysToMonthLeap : DaysToMonthCommon;
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307 month = numDays >> 5 + 1;
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308 while (numDays >= monthDays[month])
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309 month++;
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310
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311 day = numDays - monthDays[month - 1] + 1;
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312 }
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313
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314 package static uint extractPart (long ticks, DatePart part)
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315 {
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316 uint year, month, day, dayOfYear, era;
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317
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318 splitDate(ticks, year, month, day, dayOfYear, era);
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319
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320 if (part is DatePart.Year)
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321 return year;
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322
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323 if (part is DatePart.Month)
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324 return month;
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325
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326 if (part is DatePart.DayOfYear)
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327 return dayOfYear;
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328
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329 return day;
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330 }
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331
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332 package static long getDateTicks (uint year, uint month, uint day, uint era)
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333 {
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334 auto monthDays = staticIsLeapYear(year, era) ? DaysToMonthLeap : DaysToMonthCommon;
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335 if(era == BC_ERA)
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336 {
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337 year += 2;
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338 return -cast(long)( (year - 3) * 365 + year / 4 - year / 100 + year / 400 + monthDays[12] - (monthDays[month - 1] + day - 1)) * TimeSpan.TicksPerDay;
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339 }
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340 else
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341 {
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342 year--;
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343 return (year * 365 + year / 4 - year / 100 + year / 400 + monthDays[month - 1] + day - 1) * TimeSpan.TicksPerDay;
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344 }
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345 }
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346
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347 package static bool staticIsLeapYear(uint year, uint era)
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348 {
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349 if(era == BC_ERA)
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350 return staticIsLeapYear(year - 1, AD_ERA);
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351 if(era == AD_ERA)
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352 return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
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353 return false;
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354 }
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355 }
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356
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357 debug(Gregorian)
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358 {
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359 import tango.io.Stdout;
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360
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361 void output(Time t)
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362 {
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363 Date d = Gregorian.generic.toDate(t);
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364 TimeOfDay tod = t.time;
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365 Stdout.format("{}/{}/{:d4} {} {}:{:d2}:{:d2}.{:d3} dow:{}",
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366 d.month, d.day, d.year, d.era == Gregorian.AD_ERA ? "AD" : "BC",
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367 tod.hours, tod.minutes, tod.seconds, tod.millis, d.dow).newline;
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368 }
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369
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370 void main()
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371 {
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372 Time t = Time(365 * TimeSpan.TicksPerDay);
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373 output(t);
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374 for(int i = 0; i < 366 + 365; i++)
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375 {
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376 t -= TimeSpan.days(1);
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377 output(t);
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378 }
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379 }
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380 }
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381
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382 debug(UnitTest)
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383 {
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384 unittest
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385 {
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386 //
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387 // check Gregorian date handles positive time.
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388 //
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389 Time t = Time.epoch + TimeSpan.days(365);
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390 Date d = Gregorian.generic.toDate(t);
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391 assert(d.year == 2);
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392 assert(d.month == 1);
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393 assert(d.day == 1);
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394 assert(d.era == Gregorian.AD_ERA);
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395 assert(d.doy == 1);
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396 //
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397 // note that this is in disagreement with the Julian Calendar
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398 //
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399 assert(d.dow == Gregorian.DayOfWeek.Tuesday);
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400
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401 //
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402 // check that it handles negative time
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403 //
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404 t = Time.epoch - TimeSpan.days(366);
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405 d = Gregorian.generic.toDate(t);
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406 assert(d.year == 1);
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407 assert(d.month == 1);
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408 assert(d.day == 1);
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409 assert(d.era == Gregorian.BC_ERA);
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410 assert(d.doy == 1);
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411 assert(d.dow == Gregorian.DayOfWeek.Saturday);
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412
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413 }
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414 }
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