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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 // Dart core library. | 4 // Dart core library. |
5 | 5 |
6 // VM implementation of DateTime. | 6 // VM implementation of DateTime. |
7 @patch class DateTime { | 7 @patch |
| 8 class DateTime { |
8 // Natives. | 9 // Natives. |
9 // The natives have been moved up here to work around Issue 10401. | 10 // The natives have been moved up here to work around Issue 10401. |
10 static int _getCurrentMicros() native "DateTime_currentTimeMicros"; | 11 static int _getCurrentMicros() native "DateTime_currentTimeMicros"; |
11 | 12 |
12 static String _timeZoneNameForClampedSeconds(int secondsSinceEpoch) | 13 static String _timeZoneNameForClampedSeconds(int secondsSinceEpoch) |
13 native "DateTime_timeZoneName"; | 14 native "DateTime_timeZoneName"; |
14 | 15 |
15 static int _timeZoneOffsetInSecondsForClampedSeconds(int secondsSinceEpoch) | 16 static int _timeZoneOffsetInSecondsForClampedSeconds(int secondsSinceEpoch) |
16 native "DateTime_timeZoneOffsetInSeconds"; | 17 native "DateTime_timeZoneOffsetInSeconds"; |
17 | 18 |
18 static int _localTimeZoneAdjustmentInSeconds() | 19 static int _localTimeZoneAdjustmentInSeconds() |
19 native "DateTime_localTimeZoneAdjustmentInSeconds"; | 20 native "DateTime_localTimeZoneAdjustmentInSeconds"; |
20 | 21 |
21 static const _MICROSECOND_INDEX = 0; | 22 static const _MICROSECOND_INDEX = 0; |
22 static const _MILLISECOND_INDEX = 1; | 23 static const _MILLISECOND_INDEX = 1; |
23 static const _SECOND_INDEX = 2; | 24 static const _SECOND_INDEX = 2; |
24 static const _MINUTE_INDEX = 3; | 25 static const _MINUTE_INDEX = 3; |
25 static const _HOUR_INDEX = 4; | 26 static const _HOUR_INDEX = 4; |
26 static const _DAY_INDEX = 5; | 27 static const _DAY_INDEX = 5; |
27 static const _WEEKDAY_INDEX = 6; | 28 static const _WEEKDAY_INDEX = 6; |
28 static const _MONTH_INDEX = 7; | 29 static const _MONTH_INDEX = 7; |
29 static const _YEAR_INDEX = 8; | 30 static const _YEAR_INDEX = 8; |
30 | 31 |
31 List __parts; | 32 List __parts; |
32 | 33 |
33 @patch DateTime.fromMillisecondsSinceEpoch(int millisecondsSinceEpoch, | 34 @patch |
34 {bool isUtc: false}) | 35 DateTime.fromMillisecondsSinceEpoch(int millisecondsSinceEpoch, |
| 36 {bool isUtc: false}) |
35 : this._withValue( | 37 : this._withValue( |
36 millisecondsSinceEpoch * Duration.MICROSECONDS_PER_MILLISECOND, | 38 millisecondsSinceEpoch * Duration.MICROSECONDS_PER_MILLISECOND, |
37 isUtc: isUtc); | 39 isUtc: isUtc); |
38 | 40 |
39 @patch DateTime.fromMicrosecondsSinceEpoch(int microsecondsSinceEpoch, | 41 @patch |
40 {bool isUtc: false}) | 42 DateTime.fromMicrosecondsSinceEpoch(int microsecondsSinceEpoch, |
| 43 {bool isUtc: false}) |
41 : this._withValue(microsecondsSinceEpoch, isUtc: isUtc); | 44 : this._withValue(microsecondsSinceEpoch, isUtc: isUtc); |
42 | 45 |
43 @patch DateTime._internal(int year, | 46 @patch |
44 int month, | 47 DateTime._internal(int year, int month, int day, int hour, int minute, |
45 int day, | 48 int second, int millisecond, int microsecond, bool isUtc) |
46 int hour, | |
47 int minute, | |
48 int second, | |
49 int millisecond, | |
50 int microsecond, | |
51 bool isUtc) | |
52 : this.isUtc = isUtc, | 49 : this.isUtc = isUtc, |
53 this._value = _brokenDownDateToValue( | 50 this._value = _brokenDownDateToValue(year, month, day, hour, minute, |
54 year, month, day, hour, minute, second, millisecond, microsecond, | 51 second, millisecond, microsecond, isUtc) { |
55 isUtc) { | |
56 if (_value == null) throw new ArgumentError(); | 52 if (_value == null) throw new ArgumentError(); |
57 if (isUtc == null) throw new ArgumentError(); | 53 if (isUtc == null) throw new ArgumentError(); |
58 } | 54 } |
59 | 55 |
60 @patch DateTime._now() | 56 @patch |
| 57 DateTime._now() |
61 : isUtc = false, | 58 : isUtc = false, |
62 _value = _getCurrentMicros() { | 59 _value = _getCurrentMicros() {} |
63 } | |
64 | 60 |
65 @patch String get timeZoneName { | 61 @patch |
| 62 String get timeZoneName { |
66 if (isUtc) return "UTC"; | 63 if (isUtc) return "UTC"; |
67 return _timeZoneName(microsecondsSinceEpoch); | 64 return _timeZoneName(microsecondsSinceEpoch); |
68 } | 65 } |
69 | 66 |
70 @patch Duration get timeZoneOffset { | 67 @patch |
| 68 Duration get timeZoneOffset { |
71 if (isUtc) return new Duration(); | 69 if (isUtc) return new Duration(); |
72 int offsetInSeconds = _timeZoneOffsetInSeconds(microsecondsSinceEpoch); | 70 int offsetInSeconds = _timeZoneOffsetInSeconds(microsecondsSinceEpoch); |
73 return new Duration(seconds: offsetInSeconds); | 71 return new Duration(seconds: offsetInSeconds); |
74 } | 72 } |
75 | 73 |
76 /** The first list contains the days until each month in non-leap years. The | 74 /** The first list contains the days until each month in non-leap years. The |
77 * second list contains the days in leap years. */ | 75 * second list contains the days in leap years. */ |
78 static const List<List<int>> _DAYS_UNTIL_MONTH = | 76 static const List<List<int>> _DAYS_UNTIL_MONTH = const [ |
79 const [const [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334], | 77 const [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334], |
80 const [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335]]; | 78 const [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335] |
| 79 ]; |
81 | 80 |
82 static List _computeUpperPart(int localMicros) { | 81 static List _computeUpperPart(int localMicros) { |
83 const int DAYS_IN_4_YEARS = 4 * 365 + 1; | 82 const int DAYS_IN_4_YEARS = 4 * 365 + 1; |
84 const int DAYS_IN_100_YEARS = 25 * DAYS_IN_4_YEARS - 1; | 83 const int DAYS_IN_100_YEARS = 25 * DAYS_IN_4_YEARS - 1; |
85 const int DAYS_IN_400_YEARS = 4 * DAYS_IN_100_YEARS + 1; | 84 const int DAYS_IN_400_YEARS = 4 * DAYS_IN_100_YEARS + 1; |
86 const int DAYS_1970_TO_2000 = 30 * 365 + 7; | 85 const int DAYS_1970_TO_2000 = 30 * 365 + 7; |
87 const int DAYS_OFFSET = 1000 * DAYS_IN_400_YEARS + 5 * DAYS_IN_400_YEARS - | 86 const int DAYS_OFFSET = |
88 DAYS_1970_TO_2000; | 87 1000 * DAYS_IN_400_YEARS + 5 * DAYS_IN_400_YEARS - DAYS_1970_TO_2000; |
89 const int YEARS_OFFSET = 400000; | 88 const int YEARS_OFFSET = 400000; |
90 | 89 |
91 int resultYear = 0; | 90 int resultYear = 0; |
92 int resultMonth = 0; | 91 int resultMonth = 0; |
93 int resultDay = 0; | 92 int resultDay = 0; |
94 | 93 |
95 // Always round down. | 94 // Always round down. |
96 final int daysSince1970 = _flooredDivision(localMicros, | 95 final int daysSince1970 = |
97 Duration.MICROSECONDS_PER_DAY); | 96 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_DAY); |
98 int days = daysSince1970; | 97 int days = daysSince1970; |
99 days += DAYS_OFFSET; | 98 days += DAYS_OFFSET; |
100 resultYear = 400 * (days ~/ DAYS_IN_400_YEARS) - YEARS_OFFSET; | 99 resultYear = 400 * (days ~/ DAYS_IN_400_YEARS) - YEARS_OFFSET; |
101 days = days.remainder(DAYS_IN_400_YEARS); | 100 days = days.remainder(DAYS_IN_400_YEARS); |
102 days--; | 101 days--; |
103 int yd1 = days ~/ DAYS_IN_100_YEARS; | 102 int yd1 = days ~/ DAYS_IN_100_YEARS; |
104 days = days.remainder(DAYS_IN_100_YEARS); | 103 days = days.remainder(DAYS_IN_100_YEARS); |
105 resultYear += 100 * yd1; | 104 resultYear += 100 * yd1; |
106 days++; | 105 days++; |
107 int yd2 = days ~/ DAYS_IN_4_YEARS; | 106 int yd2 = days ~/ DAYS_IN_4_YEARS; |
108 days = days.remainder(DAYS_IN_4_YEARS); | 107 days = days.remainder(DAYS_IN_4_YEARS); |
109 resultYear += 4 * yd2; | 108 resultYear += 4 * yd2; |
110 days--; | 109 days--; |
111 int yd3 = days ~/ 365; | 110 int yd3 = days ~/ 365; |
112 days = days.remainder(365); | 111 days = days.remainder(365); |
113 resultYear += yd3; | 112 resultYear += yd3; |
114 | 113 |
115 bool isLeap = (yd1 == 0 || yd2 != 0) && yd3 == 0; | 114 bool isLeap = (yd1 == 0 || yd2 != 0) && yd3 == 0; |
116 if (isLeap) days++; | 115 if (isLeap) days++; |
117 | 116 |
118 List<int> daysUntilMonth = _DAYS_UNTIL_MONTH[isLeap ? 1 : 0]; | 117 List<int> daysUntilMonth = _DAYS_UNTIL_MONTH[isLeap ? 1 : 0]; |
119 for (resultMonth = 12; | 118 for (resultMonth = 12; |
120 daysUntilMonth[resultMonth - 1] > days; | 119 daysUntilMonth[resultMonth - 1] > days; |
121 resultMonth--) { | 120 resultMonth--) { |
122 // Do nothing. | 121 // Do nothing. |
123 } | 122 } |
124 resultDay = days - daysUntilMonth[resultMonth - 1] + 1; | 123 resultDay = days - daysUntilMonth[resultMonth - 1] + 1; |
125 | 124 |
126 int resultMicrosecond = localMicros % Duration.MICROSECONDS_PER_MILLISECOND; | 125 int resultMicrosecond = localMicros % Duration.MICROSECONDS_PER_MILLISECOND; |
127 int resultMillisecond = | 126 int resultMillisecond = |
128 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_MILLISECOND) % | 127 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_MILLISECOND) % |
129 Duration.MILLISECONDS_PER_SECOND; | 128 Duration.MILLISECONDS_PER_SECOND; |
130 int resultSecond = | 129 int resultSecond = |
131 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_SECOND) % | 130 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_SECOND) % |
132 Duration.SECONDS_PER_MINUTE; | 131 Duration.SECONDS_PER_MINUTE; |
133 | 132 |
134 int resultMinute = _flooredDivision(localMicros, | 133 int resultMinute = |
135 Duration.MICROSECONDS_PER_MINUTE); | 134 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_MINUTE); |
136 resultMinute %= Duration.MINUTES_PER_HOUR; | 135 resultMinute %= Duration.MINUTES_PER_HOUR; |
137 | 136 |
138 int resultHour = | 137 int resultHour = |
139 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_HOUR); | 138 _flooredDivision(localMicros, Duration.MICROSECONDS_PER_HOUR); |
140 resultHour %= Duration.HOURS_PER_DAY; | 139 resultHour %= Duration.HOURS_PER_DAY; |
141 | 140 |
142 // In accordance with ISO 8601 a week | 141 // In accordance with ISO 8601 a week |
143 // starts with Monday. Monday has the value 1 up to Sunday with 7. | 142 // starts with Monday. Monday has the value 1 up to Sunday with 7. |
144 // 1970-1-1 was a Thursday. | 143 // 1970-1-1 was a Thursday. |
145 int resultWeekday = ((daysSince1970 + DateTime.THURSDAY - DateTime.MONDAY) % | 144 int resultWeekday = ((daysSince1970 + DateTime.THURSDAY - DateTime.MONDAY) % |
146 DateTime.DAYS_PER_WEEK) + DateTime.MONDAY; | 145 DateTime.DAYS_PER_WEEK) + |
| 146 DateTime.MONDAY; |
147 | 147 |
148 List list = new List(_YEAR_INDEX + 1); | 148 List list = new List(_YEAR_INDEX + 1); |
149 list[_MICROSECOND_INDEX] = resultMicrosecond; | 149 list[_MICROSECOND_INDEX] = resultMicrosecond; |
150 list[_MILLISECOND_INDEX] = resultMillisecond; | 150 list[_MILLISECOND_INDEX] = resultMillisecond; |
151 list[_SECOND_INDEX] = resultSecond; | 151 list[_SECOND_INDEX] = resultSecond; |
152 list[_MINUTE_INDEX] = resultMinute; | 152 list[_MINUTE_INDEX] = resultMinute; |
153 list[_HOUR_INDEX] = resultHour; | 153 list[_HOUR_INDEX] = resultHour; |
154 list[_DAY_INDEX] = resultDay; | 154 list[_DAY_INDEX] = resultDay; |
155 list[_WEEKDAY_INDEX] = resultWeekday; | 155 list[_WEEKDAY_INDEX] = resultWeekday; |
156 list[_MONTH_INDEX] = resultMonth; | 156 list[_MONTH_INDEX] = resultMonth; |
157 list[_YEAR_INDEX] = resultYear; | 157 list[_YEAR_INDEX] = resultYear; |
158 return list; | 158 return list; |
159 } | 159 } |
160 | 160 |
161 get _parts { | 161 get _parts { |
162 if (__parts == null) { | 162 if (__parts == null) { |
163 __parts = _computeUpperPart(_localDateInUtcMicros); | 163 __parts = _computeUpperPart(_localDateInUtcMicros); |
164 } | 164 } |
165 return __parts; | 165 return __parts; |
166 } | 166 } |
167 | 167 |
168 @patch DateTime add(Duration duration) { | 168 @patch |
169 return new DateTime._withValue( | 169 DateTime add(Duration duration) { |
170 _value + duration.inMicroseconds, isUtc: isUtc); | 170 return new DateTime._withValue(_value + duration.inMicroseconds, |
| 171 isUtc: isUtc); |
171 } | 172 } |
172 | 173 |
173 @patch DateTime subtract(Duration duration) { | 174 @patch |
174 return new DateTime._withValue( | 175 DateTime subtract(Duration duration) { |
175 _value - duration.inMicroseconds, isUtc: isUtc); | 176 return new DateTime._withValue(_value - duration.inMicroseconds, |
| 177 isUtc: isUtc); |
176 } | 178 } |
177 | 179 |
178 @patch Duration difference(DateTime other) { | 180 @patch |
| 181 Duration difference(DateTime other) { |
179 return new Duration(microseconds: _value - other._value); | 182 return new Duration(microseconds: _value - other._value); |
180 } | 183 } |
181 | 184 |
182 @patch int get millisecondsSinceEpoch => | 185 @patch |
| 186 int get millisecondsSinceEpoch => |
183 _value ~/ Duration.MICROSECONDS_PER_MILLISECOND; | 187 _value ~/ Duration.MICROSECONDS_PER_MILLISECOND; |
184 | 188 |
185 @patch int get microsecondsSinceEpoch => _value; | 189 @patch |
| 190 int get microsecondsSinceEpoch => _value; |
186 | 191 |
187 @patch int get microsecond => _parts[_MICROSECOND_INDEX]; | 192 @patch |
| 193 int get microsecond => _parts[_MICROSECOND_INDEX]; |
188 | 194 |
189 @patch int get millisecond => _parts[_MILLISECOND_INDEX]; | 195 @patch |
| 196 int get millisecond => _parts[_MILLISECOND_INDEX]; |
190 | 197 |
191 @patch int get second => _parts[_SECOND_INDEX]; | 198 @patch |
| 199 int get second => _parts[_SECOND_INDEX]; |
192 | 200 |
193 @patch int get minute => _parts[_MINUTE_INDEX]; | 201 @patch |
| 202 int get minute => _parts[_MINUTE_INDEX]; |
194 | 203 |
195 @patch int get hour => _parts[_HOUR_INDEX]; | 204 @patch |
| 205 int get hour => _parts[_HOUR_INDEX]; |
196 | 206 |
197 @patch int get day => _parts[_DAY_INDEX]; | 207 @patch |
| 208 int get day => _parts[_DAY_INDEX]; |
198 | 209 |
199 @patch int get weekday => _parts[_WEEKDAY_INDEX]; | 210 @patch |
| 211 int get weekday => _parts[_WEEKDAY_INDEX]; |
200 | 212 |
201 @patch int get month => _parts[_MONTH_INDEX]; | 213 @patch |
| 214 int get month => _parts[_MONTH_INDEX]; |
202 | 215 |
203 @patch int get year => _parts[_YEAR_INDEX]; | 216 @patch |
| 217 int get year => _parts[_YEAR_INDEX]; |
204 | 218 |
205 /** | 219 /** |
206 * Returns the amount of microseconds in UTC that represent the same values | 220 * Returns the amount of microseconds in UTC that represent the same values |
207 * as [this]. | 221 * as [this]. |
208 * | 222 * |
209 * Say `t` is the result of this function, then | 223 * Say `t` is the result of this function, then |
210 * * `this.year == new DateTime.fromMicrosecondsSinceEpoch(t, true).year`, | 224 * * `this.year == new DateTime.fromMicrosecondsSinceEpoch(t, true).year`, |
211 * * `this.month == new DateTime.fromMicrosecondsSinceEpoch(t, true).month`, | 225 * * `this.month == new DateTime.fromMicrosecondsSinceEpoch(t, true).month`, |
212 * * `this.day == new DateTime.fromMicrosecondsSinceEpoch(t, true).day`, | 226 * * `this.day == new DateTime.fromMicrosecondsSinceEpoch(t, true).day`, |
213 * * `this.hour == new DateTime.fromMicrosecondsSinceEpoch(t, true).hour`, | 227 * * `this.hour == new DateTime.fromMicrosecondsSinceEpoch(t, true).hour`, |
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225 return micros + offset; | 239 return micros + offset; |
226 } | 240 } |
227 | 241 |
228 static int _flooredDivision(int a, int b) { | 242 static int _flooredDivision(int a, int b) { |
229 return (a - (a < 0 ? b - 1 : 0)) ~/ b; | 243 return (a - (a < 0 ? b - 1 : 0)) ~/ b; |
230 } | 244 } |
231 | 245 |
232 // Returns the days since 1970 for the start of the given [year]. | 246 // Returns the days since 1970 for the start of the given [year]. |
233 // [year] may be before epoch. | 247 // [year] may be before epoch. |
234 static int _dayFromYear(int year) { | 248 static int _dayFromYear(int year) { |
235 return 365 * (year - 1970) | 249 return 365 * (year - 1970) + |
236 + _flooredDivision(year - 1969, 4) | 250 _flooredDivision(year - 1969, 4) - |
237 - _flooredDivision(year - 1901, 100) | 251 _flooredDivision(year - 1901, 100) + |
238 + _flooredDivision(year - 1601, 400); | 252 _flooredDivision(year - 1601, 400); |
239 } | 253 } |
240 | 254 |
241 static bool _isLeapYear(y) { | 255 static bool _isLeapYear(y) { |
242 // (y % 16 == 0) matches multiples of 400, and is faster than % 400. | 256 // (y % 16 == 0) matches multiples of 400, and is faster than % 400. |
243 return (y % 4 == 0) && ((y % 16 == 0) || (y % 100 != 0)); | 257 return (y % 4 == 0) && ((y % 16 == 0) || (y % 100 != 0)); |
244 } | 258 } |
245 | 259 |
246 /// Converts the given broken down date to microseconds. | 260 /// Converts the given broken down date to microseconds. |
247 @patch static int _brokenDownDateToValue( | 261 @patch |
248 int year, int month, int day, | 262 static int _brokenDownDateToValue(int year, int month, int day, int hour, |
249 int hour, int minute, int second, int millisecond, int microsecond, | 263 int minute, int second, int millisecond, int microsecond, bool isUtc) { |
250 bool isUtc) { | |
251 // Simplify calculations by working with zero-based month. | 264 // Simplify calculations by working with zero-based month. |
252 --month; | 265 --month; |
253 // Deal with under and overflow. | 266 // Deal with under and overflow. |
254 if (month >= 12) { | 267 if (month >= 12) { |
255 year += month ~/ 12; | 268 year += month ~/ 12; |
256 month = month % 12; | 269 month = month % 12; |
257 } else if (month < 0) { | 270 } else if (month < 0) { |
258 int realMonth = month % 12; | 271 int realMonth = month % 12; |
259 year += (month - realMonth) ~/ 12; | 272 year += (month - realMonth) ~/ 12; |
260 month = realMonth; | 273 month = realMonth; |
261 } | 274 } |
262 | 275 |
263 // First compute the seconds in UTC, independent of the [isUtc] flag. If | 276 // First compute the seconds in UTC, independent of the [isUtc] flag. If |
264 // necessary we will add the time-zone offset later on. | 277 // necessary we will add the time-zone offset later on. |
265 int days = day - 1; | 278 int days = day - 1; |
266 days += _DAYS_UNTIL_MONTH[_isLeapYear(year) ? 1 : 0][month]; | 279 days += _DAYS_UNTIL_MONTH[_isLeapYear(year) ? 1 : 0][month]; |
267 days += _dayFromYear(year); | 280 days += _dayFromYear(year); |
268 int microsecondsSinceEpoch = | 281 int microsecondsSinceEpoch = days * Duration.MICROSECONDS_PER_DAY + |
269 days * Duration.MICROSECONDS_PER_DAY + | 282 hour * Duration.MICROSECONDS_PER_HOUR + |
270 hour * Duration.MICROSECONDS_PER_HOUR + | |
271 minute * Duration.MICROSECONDS_PER_MINUTE + | 283 minute * Duration.MICROSECONDS_PER_MINUTE + |
272 second * Duration.MICROSECONDS_PER_SECOND + | 284 second * Duration.MICROSECONDS_PER_SECOND + |
273 millisecond * Duration.MICROSECONDS_PER_MILLISECOND + | 285 millisecond * Duration.MICROSECONDS_PER_MILLISECOND + |
274 microsecond; | 286 microsecond; |
275 | 287 |
276 // Since [_timeZoneOffsetInSeconds] will crash if the input is far out of | 288 // Since [_timeZoneOffsetInSeconds] will crash if the input is far out of |
277 // the valid range we do a preliminary test that weeds out values that can | 289 // the valid range we do a preliminary test that weeds out values that can |
278 // not become valid even with timezone adjustments. | 290 // not become valid even with timezone adjustments. |
279 // The timezone adjustment is always less than a day, so adding a security | 291 // The timezone adjustment is always less than a day, so adding a security |
280 // margin of one day should be enough. | 292 // margin of one day should be enough. |
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370 * | 382 * |
371 * * The time since the beginning of the year is the same. | 383 * * The time since the beginning of the year is the same. |
372 * * If the given date is in a leap year then the returned | 384 * * If the given date is in a leap year then the returned |
373 * seconds are in a leap year, too. | 385 * seconds are in a leap year, too. |
374 * * The week day of given date is the same as the one for the | 386 * * The week day of given date is the same as the one for the |
375 * returned date. | 387 * returned date. |
376 */ | 388 */ |
377 static int _equivalentSeconds(int microsecondsSinceEpoch) { | 389 static int _equivalentSeconds(int microsecondsSinceEpoch) { |
378 const int CUT_OFF_SECONDS = 0x7FFFFFFF; | 390 const int CUT_OFF_SECONDS = 0x7FFFFFFF; |
379 | 391 |
380 int secondsSinceEpoch = _flooredDivision(microsecondsSinceEpoch, | 392 int secondsSinceEpoch = _flooredDivision( |
381 Duration.MICROSECONDS_PER_SECOND); | 393 microsecondsSinceEpoch, Duration.MICROSECONDS_PER_SECOND); |
382 | 394 |
383 if (secondsSinceEpoch.abs() > CUT_OFF_SECONDS) { | 395 if (secondsSinceEpoch.abs() > CUT_OFF_SECONDS) { |
384 int year = _yearsFromSecondsSinceEpoch(secondsSinceEpoch); | 396 int year = _yearsFromSecondsSinceEpoch(secondsSinceEpoch); |
385 int days = _dayFromYear(year); | 397 int days = _dayFromYear(year); |
386 int equivalentYear = _equivalentYear(year); | 398 int equivalentYear = _equivalentYear(year); |
387 int equivalentDays = _dayFromYear(equivalentYear); | 399 int equivalentDays = _dayFromYear(equivalentYear); |
388 int diffDays = equivalentDays - days; | 400 int diffDays = equivalentDays - days; |
389 secondsSinceEpoch += diffDays * Duration.SECONDS_PER_DAY; | 401 secondsSinceEpoch += diffDays * Duration.SECONDS_PER_DAY; |
390 } | 402 } |
391 return secondsSinceEpoch; | 403 return secondsSinceEpoch; |
392 } | 404 } |
393 | 405 |
394 static int _timeZoneOffsetInSeconds(int microsecondsSinceEpoch) { | 406 static int _timeZoneOffsetInSeconds(int microsecondsSinceEpoch) { |
395 int equivalentSeconds = _equivalentSeconds(microsecondsSinceEpoch); | 407 int equivalentSeconds = _equivalentSeconds(microsecondsSinceEpoch); |
396 return _timeZoneOffsetInSecondsForClampedSeconds(equivalentSeconds); | 408 return _timeZoneOffsetInSecondsForClampedSeconds(equivalentSeconds); |
397 } | 409 } |
398 | 410 |
399 static String _timeZoneName(int microsecondsSinceEpoch) { | 411 static String _timeZoneName(int microsecondsSinceEpoch) { |
400 int equivalentSeconds = _equivalentSeconds(microsecondsSinceEpoch); | 412 int equivalentSeconds = _equivalentSeconds(microsecondsSinceEpoch); |
401 return _timeZoneNameForClampedSeconds(equivalentSeconds); | 413 return _timeZoneNameForClampedSeconds(equivalentSeconds); |
402 } | 414 } |
403 } | 415 } |
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