5 * Stephane Delcroix <stephane@delcroix.org>
7 * Copyright 2011 Xamarin Inc.
9 * Permission is hereby granted, free of charge, to any person obtaining
10 * a copy of this software and associated documentation files (the
11 * "Software"), to deal in the Software without restriction, including
12 * without limitation the rights to use, copy, modify, merge, publish,
13 * distribute, sublicense, and/or sell copies of the Software, and to
14 * permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Runtime.CompilerServices;
32 #if !INSIDE_CORLIB && (NET_4_0 || MOONLIGHT || MOBILE)
34 [assembly:TypeForwardedTo (typeof(TimeZoneInfo))]
36 #elif (INSIDE_CORLIB && (NET_4_0 || MOONLIGHT || MOBILE)) || (!INSIDE_CORLIB && (NET_3_5 && !NET_4_0 && !MOBILE))
38 using System.Collections.Generic;
39 using System.Collections.ObjectModel;
40 using System.Runtime.Serialization;
48 using Microsoft.Win32;
53 [TypeForwardedFrom (Consts.AssemblySystemCore_3_5)]
54 #elif MOONLIGHT || MOBILE
55 [TypeForwardedFrom (Consts.AssemblySystem_Core)]
57 [SerializableAttribute]
58 public sealed partial class TimeZoneInfo : IEquatable<TimeZoneInfo>, ISerializable, IDeserializationCallback
60 TimeSpan baseUtcOffset;
61 public TimeSpan BaseUtcOffset {
62 get { return baseUtcOffset; }
65 string daylightDisplayName;
66 public string DaylightName {
68 return supportsDaylightSavingTime
75 public string DisplayName {
76 get { return displayName; }
84 static TimeZoneInfo local;
85 public static TimeZoneInfo Local {
89 local = ZoneInfoDB.Default;
91 using (Stream stream = GetMonoTouchDefault ()) {
92 return BuildFromStream ("Local", stream);
96 local = FindSystemTimeZoneByFileName ("Local", "/etc/localtime");
99 local = FindSystemTimeZoneByFileName ("Local", Path.Combine (TimeZoneDirectory, "localtime"));
101 throw new TimeZoneNotFoundException ();
105 if (IsWindows && LocalZoneKey != null) {
106 string name = (string)LocalZoneKey.GetValue ("TimeZoneKeyName");
107 name = TrimSpecial (name);
109 local = TimeZoneInfo.FindSystemTimeZoneById (name);
113 throw new TimeZoneNotFoundException ();
120 string standardDisplayName;
121 public string StandardName {
122 get { return standardDisplayName; }
125 bool supportsDaylightSavingTime;
126 public bool SupportsDaylightSavingTime {
127 get { return supportsDaylightSavingTime; }
130 static TimeZoneInfo utc;
131 public static TimeZoneInfo Utc {
134 utc = CreateCustomTimeZone ("UTC", new TimeSpan (0), "UTC", "UTC");
139 static string timeZoneDirectory = null;
140 static string TimeZoneDirectory {
142 if (timeZoneDirectory == null)
143 timeZoneDirectory = "/usr/share/zoneinfo";
144 return timeZoneDirectory;
148 timeZoneDirectory = value;
152 private AdjustmentRule [] adjustmentRules;
156 /// Determine whether windows of not (taken Stephane Delcroix's code)
158 private static bool IsWindows
161 int platform = (int) Environment.OSVersion.Platform;
162 return ((platform != 4) && (platform != 6) && (platform != 128));
167 /// Needed to trim misc garbage in MS registry keys
169 private static string TrimSpecial (string str)
172 while (Istart < str.Length && !char.IsLetterOrDigit(str[Istart])) Istart++;
173 var Iend = str.Length - 1;
174 while (Iend > Istart && !char.IsLetterOrDigit(str[Iend])) Iend--;
176 return str.Substring (Istart, Iend-Istart+1);
179 static RegistryKey timeZoneKey = null;
180 static RegistryKey TimeZoneKey {
182 if (timeZoneKey != null)
187 return timeZoneKey = Registry.LocalMachine.OpenSubKey (
188 "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones",
193 static RegistryKey localZoneKey = null;
194 static RegistryKey LocalZoneKey {
196 if (localZoneKey != null)
202 return localZoneKey = Registry.LocalMachine.OpenSubKey (
203 "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation", false);
208 public static void ClearCachedData ()
212 systemTimeZones = null;
215 public static DateTime ConvertTime (DateTime dateTime, TimeZoneInfo destinationTimeZone)
217 return ConvertTime (dateTime, TimeZoneInfo.Local, destinationTimeZone);
220 public static DateTime ConvertTime (DateTime dateTime, TimeZoneInfo sourceTimeZone, TimeZoneInfo destinationTimeZone)
222 if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone != TimeZoneInfo.Local)
223 throw new ArgumentException ("Kind property of dateTime is Local but the sourceTimeZone does not equal TimeZoneInfo.Local");
225 if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone != TimeZoneInfo.Utc)
226 throw new ArgumentException ("Kind property of dateTime is Utc but the sourceTimeZone does not equal TimeZoneInfo.Utc");
228 if (sourceTimeZone.IsInvalidTime (dateTime))
229 throw new ArgumentException ("dateTime parameter is an invalid time");
231 if (sourceTimeZone == null)
232 throw new ArgumentNullException ("sourceTimeZone");
234 if (destinationTimeZone == null)
235 throw new ArgumentNullException ("destinationTimeZone");
237 if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone == TimeZoneInfo.Local && destinationTimeZone == TimeZoneInfo.Local)
240 DateTime utc = ConvertTimeToUtc (dateTime);
242 if (destinationTimeZone == TimeZoneInfo.Utc)
245 return ConvertTimeFromUtc (utc, destinationTimeZone);
249 public static DateTimeOffset ConvertTime (DateTimeOffset dateTimeOffset, TimeZoneInfo destinationTimeZone)
251 throw new NotImplementedException ();
254 public static DateTime ConvertTimeBySystemTimeZoneId (DateTime dateTime, string destinationTimeZoneId)
256 return ConvertTime (dateTime, FindSystemTimeZoneById (destinationTimeZoneId));
259 public static DateTime ConvertTimeBySystemTimeZoneId (DateTime dateTime, string sourceTimeZoneId, string destinationTimeZoneId)
261 return ConvertTime (dateTime, FindSystemTimeZoneById (sourceTimeZoneId), FindSystemTimeZoneById (destinationTimeZoneId));
264 public static DateTimeOffset ConvertTimeBySystemTimeZoneId (DateTimeOffset dateTimeOffset, string destinationTimeZoneId)
266 return ConvertTime (dateTimeOffset, FindSystemTimeZoneById (destinationTimeZoneId));
269 private DateTime ConvertTimeFromUtc (DateTime dateTime)
271 if (dateTime.Kind == DateTimeKind.Local)
272 throw new ArgumentException ("Kind property of dateTime is Local");
274 if (this == TimeZoneInfo.Utc)
275 return DateTime.SpecifyKind (dateTime, DateTimeKind.Utc);
277 //FIXME: do not rely on DateTime implementation !
278 if (this == TimeZoneInfo.Local)
279 return DateTime.SpecifyKind (dateTime.ToLocalTime (), DateTimeKind.Unspecified);
281 AdjustmentRule rule = GetApplicableRule (dateTime);
283 if (rule != null && IsDaylightSavingTime (DateTime.SpecifyKind (dateTime, DateTimeKind.Utc)))
284 return DateTime.SpecifyKind (dateTime + BaseUtcOffset + rule.DaylightDelta , DateTimeKind.Unspecified);
286 return DateTime.SpecifyKind (dateTime + BaseUtcOffset, DateTimeKind.Unspecified);
289 public static DateTime ConvertTimeFromUtc (DateTime dateTime, TimeZoneInfo destinationTimeZone)
291 if (destinationTimeZone == null)
292 throw new ArgumentNullException ("destinationTimeZone");
294 return destinationTimeZone.ConvertTimeFromUtc (dateTime);
297 public static DateTime ConvertTimeToUtc (DateTime dateTime)
299 if (dateTime.Kind == DateTimeKind.Utc)
302 //FIXME: do not rely on DateTime implementation !
303 return DateTime.SpecifyKind (dateTime.ToUniversalTime (), DateTimeKind.Utc);
306 public static DateTime ConvertTimeToUtc (DateTime dateTime, TimeZoneInfo sourceTimeZone)
308 if (sourceTimeZone == null)
309 throw new ArgumentNullException ("sourceTimeZone");
311 if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone != TimeZoneInfo.Utc)
312 throw new ArgumentException ("Kind property of dateTime is Utc but the sourceTimeZone does not equal TimeZoneInfo.Utc");
314 if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone != TimeZoneInfo.Local)
315 throw new ArgumentException ("Kind property of dateTime is Local but the sourceTimeZone does not equal TimeZoneInfo.Local");
317 if (sourceTimeZone.IsInvalidTime (dateTime))
318 throw new ArgumentException ("dateTime parameter is an invalid time");
320 if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone == TimeZoneInfo.Utc)
323 if (dateTime.Kind == DateTimeKind.Utc)
326 if (dateTime.Kind == DateTimeKind.Local)
327 return ConvertTimeToUtc (dateTime);
329 if (sourceTimeZone.IsAmbiguousTime (dateTime) || !sourceTimeZone.IsDaylightSavingTime (dateTime))
330 return DateTime.SpecifyKind (dateTime - sourceTimeZone.BaseUtcOffset, DateTimeKind.Utc);
332 AdjustmentRule rule = sourceTimeZone.GetApplicableRule (dateTime);
334 return DateTime.SpecifyKind (dateTime - sourceTimeZone.BaseUtcOffset - rule.DaylightDelta, DateTimeKind.Utc);
336 return DateTime.SpecifyKind (dateTime - sourceTimeZone.BaseUtcOffset, DateTimeKind.Utc);
340 public static TimeZoneInfo CreateCustomTimeZone (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName)
342 return CreateCustomTimeZone (id, baseUtcOffset, displayName, standardDisplayName, null, null, true);
345 public static TimeZoneInfo CreateCustomTimeZone (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules)
347 return CreateCustomTimeZone (id, baseUtcOffset, displayName, standardDisplayName, daylightDisplayName, adjustmentRules, false);
350 public static TimeZoneInfo CreateCustomTimeZone ( string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules, bool disableDaylightSavingTime)
352 return new TimeZoneInfo (id, baseUtcOffset, displayName, standardDisplayName, daylightDisplayName, adjustmentRules, disableDaylightSavingTime);
356 public override bool Equals (object obj)
358 return Equals (obj as TimeZoneInfo);
362 public bool Equals (TimeZoneInfo other)
367 return other.Id == this.Id && HasSameRules (other);
370 public static TimeZoneInfo FindSystemTimeZoneById (string id)
372 //FIXME: this method should check for cached values in systemTimeZones
374 throw new ArgumentNullException ("id");
376 if (TimeZoneKey != null)
378 RegistryKey key = TimeZoneKey.OpenSubKey (id, false);
380 throw new TimeZoneNotFoundException ();
381 return FromRegistryKey(id, key);
385 return ZoneInfoDB.GetTimeZone (id);
387 // Local requires special logic that already exists in the Local property (bug #326)
391 using (Stream stream = GetMonoTouchData (id)) {
392 return BuildFromStream (id, stream);
395 string filepath = Path.Combine (TimeZoneDirectory, id);
396 return FindSystemTimeZoneByFileName (id, filepath);
398 throw new NotImplementedException ();
404 private static TimeZoneInfo FindSystemTimeZoneByFileName (string id, string filepath)
406 if (!File.Exists (filepath))
407 throw new TimeZoneNotFoundException ();
409 using (FileStream stream = File.OpenRead (filepath)) {
410 return BuildFromStream (id, stream);
414 #if LIBC || MONOTOUCH
415 const int BUFFER_SIZE = 16384; //Big enough for any tz file (on Oct 2008, all tz files are under 10k)
417 private static TimeZoneInfo BuildFromStream (string id, Stream stream)
419 byte [] buffer = new byte [BUFFER_SIZE];
420 int length = stream.Read (buffer, 0, BUFFER_SIZE);
422 if (!ValidTZFile (buffer, length))
423 throw new InvalidTimeZoneException ("TZ file too big for the buffer");
426 return ParseTZBuffer (id, buffer, length);
427 } catch (Exception e) {
428 throw new InvalidTimeZoneException (e.Message);
434 private static TimeZoneInfo FromRegistryKey (string id, RegistryKey key)
436 byte [] reg_tzi = (byte []) key.GetValue ("TZI");
439 throw new InvalidTimeZoneException ();
441 int bias = BitConverter.ToInt32 (reg_tzi, 0);
442 TimeSpan baseUtcOffset = new TimeSpan (0, -bias, 0);
444 string display_name = (string) key.GetValue ("Display");
445 string standard_name = (string) key.GetValue ("Std");
446 string daylight_name = (string) key.GetValue ("Dlt");
448 List<AdjustmentRule> adjustmentRules = new List<AdjustmentRule> ();
450 RegistryKey dst_key = key.OpenSubKey ("Dynamic DST", false);
451 if (dst_key != null) {
452 int first_year = (int) dst_key.GetValue ("FirstEntry");
453 int last_year = (int) dst_key.GetValue ("LastEntry");
456 for (year=first_year; year<=last_year; year++) {
457 byte [] dst_tzi = (byte []) dst_key.GetValue (year.ToString ());
458 if (dst_tzi != null) {
459 int start_year = year == first_year ? 1 : year;
460 int end_year = year == last_year ? 9999 : year;
461 ParseRegTzi(adjustmentRules, start_year, end_year, dst_tzi);
466 ParseRegTzi(adjustmentRules, 1, 9999, reg_tzi);
468 return CreateCustomTimeZone (id, baseUtcOffset, display_name, standard_name, daylight_name, ValidateRules (adjustmentRules).ToArray ());
471 private static void ParseRegTzi (List<AdjustmentRule> adjustmentRules, int start_year, int end_year, byte [] buffer)
473 //int standard_bias = BitConverter.ToInt32 (buffer, 4); /* not sure how to handle this */
474 int daylight_bias = BitConverter.ToInt32 (buffer, 8);
476 int standard_year = BitConverter.ToInt16 (buffer, 12);
477 int standard_month = BitConverter.ToInt16 (buffer, 14);
478 int standard_dayofweek = BitConverter.ToInt16 (buffer, 16);
479 int standard_day = BitConverter.ToInt16 (buffer, 18);
480 int standard_hour = BitConverter.ToInt16 (buffer, 20);
481 int standard_minute = BitConverter.ToInt16 (buffer, 22);
482 int standard_second = BitConverter.ToInt16 (buffer, 24);
483 int standard_millisecond = BitConverter.ToInt16 (buffer, 26);
485 int daylight_year = BitConverter.ToInt16 (buffer, 28);
486 int daylight_month = BitConverter.ToInt16 (buffer, 30);
487 int daylight_dayofweek = BitConverter.ToInt16 (buffer, 32);
488 int daylight_day = BitConverter.ToInt16 (buffer, 34);
489 int daylight_hour = BitConverter.ToInt16 (buffer, 36);
490 int daylight_minute = BitConverter.ToInt16 (buffer, 38);
491 int daylight_second = BitConverter.ToInt16 (buffer, 40);
492 int daylight_millisecond = BitConverter.ToInt16 (buffer, 42);
494 if (standard_month == 0 || daylight_month == 0)
498 DateTime start_timeofday = new DateTime (1, 1, 1, daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
499 TransitionTime start_transition_time;
501 if (daylight_year == 0) {
502 start_date = new DateTime (start_year, 1, 1);
503 start_transition_time = TransitionTime.CreateFloatingDateRule (
504 start_timeofday, daylight_month, daylight_day,
505 (DayOfWeek) daylight_dayofweek);
508 start_date = new DateTime (daylight_year, daylight_month, daylight_day,
509 daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
510 start_transition_time = TransitionTime.CreateFixedDateRule (
511 start_timeofday, daylight_month, daylight_day);
515 DateTime end_timeofday = new DateTime (1, 1, 1, standard_hour, standard_minute, standard_second, standard_millisecond);
516 TransitionTime end_transition_time;
518 if (standard_year == 0) {
519 end_date = new DateTime (end_year, 12, 31);
520 end_transition_time = TransitionTime.CreateFloatingDateRule (
521 end_timeofday, standard_month, standard_day,
522 (DayOfWeek) standard_dayofweek);
525 end_date = new DateTime (standard_year, standard_month, standard_day,
526 standard_hour, standard_minute, standard_second, standard_millisecond);
527 end_transition_time = TransitionTime.CreateFixedDateRule (
528 end_timeofday, standard_month, standard_day);
531 TimeSpan daylight_delta = new TimeSpan(0, -daylight_bias, 0);
533 adjustmentRules.Add (AdjustmentRule.CreateAdjustmentRule (
534 start_date, end_date, daylight_delta,
535 start_transition_time, end_transition_time));
539 public static TimeZoneInfo FromSerializedString (string source)
541 throw new NotImplementedException ();
544 public AdjustmentRule [] GetAdjustmentRules ()
546 if (!supportsDaylightSavingTime)
547 return new AdjustmentRule [0];
549 return (AdjustmentRule []) adjustmentRules.Clone ();
552 public TimeSpan [] GetAmbiguousTimeOffsets (DateTime dateTime)
554 if (!IsAmbiguousTime (dateTime))
555 throw new ArgumentException ("dateTime is not an ambiguous time");
557 AdjustmentRule rule = GetApplicableRule (dateTime);
559 return new TimeSpan[] {baseUtcOffset, baseUtcOffset + rule.DaylightDelta};
561 return new TimeSpan[] {baseUtcOffset, baseUtcOffset};
564 public TimeSpan [] GetAmbiguousTimeOffsets (DateTimeOffset dateTimeOffset)
566 if (!IsAmbiguousTime (dateTimeOffset))
567 throw new ArgumentException ("dateTimeOffset is not an ambiguous time");
569 throw new NotImplementedException ();
572 public override int GetHashCode ()
574 int hash_code = Id.GetHashCode ();
575 foreach (AdjustmentRule rule in GetAdjustmentRules ())
576 hash_code ^= rule.GetHashCode ();
581 void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
583 public void GetObjectData (SerializationInfo info, StreamingContext context)
586 throw new NotImplementedException ();
589 //FIXME: change this to a generic Dictionary and allow caching for FindSystemTimeZoneById
590 private static List<TimeZoneInfo> systemTimeZones = null;
591 public static ReadOnlyCollection<TimeZoneInfo> GetSystemTimeZones ()
593 if (systemTimeZones == null) {
594 systemTimeZones = new List<TimeZoneInfo> ();
596 if (TimeZoneKey != null) {
597 foreach (string id in TimeZoneKey.GetSubKeyNames ()) {
599 systemTimeZones.Add (FindSystemTimeZoneById (id));
603 return new ReadOnlyCollection<TimeZoneInfo> (systemTimeZones);
607 foreach (string id in ZoneInfoDB.GetAvailableIds ()) {
608 var tz = ZoneInfoDB.GetTimeZone (id);
610 systemTimeZones.Add (tz);
613 if (systemTimeZones.Count == 0) {
614 foreach (string name in GetMonoTouchNames ()) {
615 using (Stream stream = GetMonoTouchData (name)) {
616 systemTimeZones.Add (BuildFromStream (name, stream));
621 string[] continents = new string [] {"Africa", "America", "Antarctica", "Arctic", "Asia", "Atlantic", "Brazil", "Canada", "Chile", "Europe", "Indian", "Mexico", "Mideast", "Pacific", "US"};
622 foreach (string continent in continents) {
624 foreach (string zonepath in Directory.GetFiles (Path.Combine (TimeZoneDirectory, continent))) {
626 string id = String.Format ("{0}/{1}", continent, Path.GetFileName (zonepath));
627 systemTimeZones.Add (FindSystemTimeZoneById (id));
628 } catch (ArgumentNullException) {
629 } catch (TimeZoneNotFoundException) {
630 } catch (InvalidTimeZoneException) {
631 } catch (Exception) {
638 throw new NotImplementedException ("This method is not implemented for this platform");
641 return new ReadOnlyCollection<TimeZoneInfo> (systemTimeZones);
644 public TimeSpan GetUtcOffset (DateTime dateTime)
646 if (IsDaylightSavingTime (dateTime)) {
647 AdjustmentRule rule = GetApplicableRule (dateTime);
649 return BaseUtcOffset + rule.DaylightDelta;
652 return BaseUtcOffset;
655 public TimeSpan GetUtcOffset (DateTimeOffset dateTimeOffset)
657 throw new NotImplementedException ();
660 public bool HasSameRules (TimeZoneInfo other)
663 throw new ArgumentNullException ("other");
665 if ((this.adjustmentRules == null) != (other.adjustmentRules == null))
668 if (this.adjustmentRules == null)
671 if (this.BaseUtcOffset != other.BaseUtcOffset)
674 if (this.adjustmentRules.Length != other.adjustmentRules.Length)
677 for (int i = 0; i < adjustmentRules.Length; i++) {
678 if (! (this.adjustmentRules [i]).Equals (other.adjustmentRules [i]))
685 public bool IsAmbiguousTime (DateTime dateTime)
687 if (dateTime.Kind == DateTimeKind.Local && IsInvalidTime (dateTime))
688 throw new ArgumentException ("Kind is Local and time is Invalid");
690 if (this == TimeZoneInfo.Utc)
693 if (dateTime.Kind == DateTimeKind.Utc)
694 dateTime = ConvertTimeFromUtc (dateTime);
696 if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Local)
697 dateTime = ConvertTime (dateTime, TimeZoneInfo.Local, this);
699 AdjustmentRule rule = GetApplicableRule (dateTime);
701 DateTime tpoint = TransitionPoint (rule.DaylightTransitionEnd, dateTime.Year);
702 if (dateTime > tpoint - rule.DaylightDelta && dateTime <= tpoint)
709 public bool IsAmbiguousTime (DateTimeOffset dateTimeOffset)
711 throw new NotImplementedException ();
714 public bool IsDaylightSavingTime (DateTime dateTime)
716 if (dateTime.Kind == DateTimeKind.Local && IsInvalidTime (dateTime))
717 throw new ArgumentException ("dateTime is invalid and Kind is Local");
719 if (this == TimeZoneInfo.Utc)
722 if (!SupportsDaylightSavingTime)
724 //FIXME: do not rely on DateTime implementation !
725 if ((dateTime.Kind == DateTimeKind.Local || dateTime.Kind == DateTimeKind.Unspecified) && this == TimeZoneInfo.Local)
726 return dateTime.IsDaylightSavingTime ();
728 //FIXME: do not rely on DateTime implementation !
729 if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Utc)
730 return IsDaylightSavingTime (DateTime.SpecifyKind (dateTime.ToUniversalTime (), DateTimeKind.Utc));
732 AdjustmentRule rule = GetApplicableRule (dateTime.Date);
736 DateTime DST_start = TransitionPoint (rule.DaylightTransitionStart, dateTime.Year);
737 DateTime DST_end = TransitionPoint (rule.DaylightTransitionEnd, dateTime.Year + ((rule.DaylightTransitionStart.Month < rule.DaylightTransitionEnd.Month) ? 0 : 1));
738 if (dateTime.Kind == DateTimeKind.Utc) {
739 DST_start -= BaseUtcOffset;
740 DST_end -= (BaseUtcOffset + rule.DaylightDelta);
743 return (dateTime >= DST_start && dateTime < DST_end);
746 public bool IsDaylightSavingTime (DateTimeOffset dateTimeOffset)
748 throw new NotImplementedException ();
751 public bool IsInvalidTime (DateTime dateTime)
753 if (dateTime.Kind == DateTimeKind.Utc)
755 if (dateTime.Kind == DateTimeKind.Local && this != Local)
758 AdjustmentRule rule = GetApplicableRule (dateTime);
760 DateTime tpoint = TransitionPoint (rule.DaylightTransitionStart, dateTime.Year);
761 if (dateTime >= tpoint && dateTime < tpoint + rule.DaylightDelta)
769 void IDeserializationCallback.OnDeserialization (object sender)
771 public void OnDeserialization (object sender)
774 throw new NotImplementedException ();
777 public string ToSerializedString ()
779 throw new NotImplementedException ();
782 public override string ToString ()
787 private TimeZoneInfo (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules, bool disableDaylightSavingTime)
790 throw new ArgumentNullException ("id");
792 if (id == String.Empty)
793 throw new ArgumentException ("id parameter is an empty string");
795 if (baseUtcOffset.Ticks % TimeSpan.TicksPerMinute != 0)
796 throw new ArgumentException ("baseUtcOffset parameter does not represent a whole number of minutes");
798 if (baseUtcOffset > new TimeSpan (14, 0, 0) || baseUtcOffset < new TimeSpan (-14, 0, 0))
799 throw new ArgumentOutOfRangeException ("baseUtcOffset parameter is greater than 14 hours or less than -14 hours");
803 throw new ArgumentException ("id parameter shouldn't be longer than 32 characters");
806 bool supportsDaylightSavingTime = !disableDaylightSavingTime;
808 if (adjustmentRules != null && adjustmentRules.Length != 0) {
809 AdjustmentRule prev = null;
810 foreach (AdjustmentRule current in adjustmentRules) {
812 throw new InvalidTimeZoneException ("one or more elements in adjustmentRules are null");
814 if ((baseUtcOffset + current.DaylightDelta < new TimeSpan (-14, 0, 0)) ||
815 (baseUtcOffset + current.DaylightDelta > new TimeSpan (14, 0, 0)))
816 throw new InvalidTimeZoneException ("Sum of baseUtcOffset and DaylightDelta of one or more object in adjustmentRules array is greater than 14 or less than -14 hours;");
818 if (prev != null && prev.DateStart > current.DateStart)
819 throw new InvalidTimeZoneException ("adjustment rules specified in adjustmentRules parameter are not in chronological order");
821 if (prev != null && prev.DateEnd > current.DateStart)
822 throw new InvalidTimeZoneException ("some adjustment rules in the adjustmentRules parameter overlap");
824 if (prev != null && prev.DateEnd == current.DateStart)
825 throw new InvalidTimeZoneException ("a date can have multiple adjustment rules applied to it");
830 supportsDaylightSavingTime = false;
834 this.baseUtcOffset = baseUtcOffset;
835 this.displayName = displayName ?? id;
836 this.standardDisplayName = standardDisplayName ?? id;
837 this.daylightDisplayName = daylightDisplayName;
838 this.supportsDaylightSavingTime = supportsDaylightSavingTime;
839 this.adjustmentRules = adjustmentRules;
842 private AdjustmentRule GetApplicableRule (DateTime dateTime)
844 //Transitions are always in standard time
845 DateTime date = dateTime;
847 if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Local)
848 date = date.ToUniversalTime () + BaseUtcOffset;
850 if (dateTime.Kind == DateTimeKind.Utc && this != TimeZoneInfo.Utc)
851 date = date + BaseUtcOffset;
853 if (adjustmentRules != null) {
854 foreach (AdjustmentRule rule in adjustmentRules) {
855 if (rule.DateStart > date.Date)
857 if (rule.DateEnd < date.Date)
865 private static DateTime TransitionPoint (TransitionTime transition, int year)
867 if (transition.IsFixedDateRule)
868 return new DateTime (year, transition.Month, transition.Day) + transition.TimeOfDay.TimeOfDay;
870 DayOfWeek first = (new DateTime (year, transition.Month, 1)).DayOfWeek;
871 int day = 1 + (transition.Week - 1) * 7 + (transition.DayOfWeek - first) % 7;
872 if (day > DateTime.DaysInMonth (year, transition.Month))
874 return new DateTime (year, transition.Month, day) + transition.TimeOfDay.TimeOfDay;
877 static List<AdjustmentRule> ValidateRules (List<AdjustmentRule> adjustmentRules)
879 AdjustmentRule prev = null;
880 foreach (AdjustmentRule current in adjustmentRules.ToArray ()) {
881 if (prev != null && prev.DateEnd > current.DateStart) {
882 adjustmentRules.Remove (current);
886 return adjustmentRules;
889 #if LIBC || MONODROID
890 private static bool ValidTZFile (byte [] buffer, int length)
892 StringBuilder magic = new StringBuilder ();
894 for (int i = 0; i < 4; i++)
895 magic.Append ((char)buffer [i]);
897 if (magic.ToString () != "TZif")
900 if (length >= BUFFER_SIZE)
906 static int SwapInt32 (int i)
908 return (((i >> 24) & 0xff)
909 | ((i >> 8) & 0xff00)
910 | ((i << 8) & 0xff0000)
914 static int ReadBigEndianInt32 (byte [] buffer, int start)
916 int i = BitConverter.ToInt32 (buffer, start);
917 if (!BitConverter.IsLittleEndian)
920 return SwapInt32 (i);
923 private static TimeZoneInfo ParseTZBuffer (string id, byte [] buffer, int length)
925 //Reading the header. 4 bytes for magic, 16 are reserved
926 int ttisgmtcnt = ReadBigEndianInt32 (buffer, 20);
927 int ttisstdcnt = ReadBigEndianInt32 (buffer, 24);
928 int leapcnt = ReadBigEndianInt32 (buffer, 28);
929 int timecnt = ReadBigEndianInt32 (buffer, 32);
930 int typecnt = ReadBigEndianInt32 (buffer, 36);
931 int charcnt = ReadBigEndianInt32 (buffer, 40);
933 if (length < 44 + timecnt * 5 + typecnt * 6 + charcnt + leapcnt * 8 + ttisstdcnt + ttisgmtcnt)
934 throw new InvalidTimeZoneException ();
936 Dictionary<int, string> abbreviations = ParseAbbreviations (buffer, 44 + 4 * timecnt + timecnt + 6 * typecnt, charcnt);
937 Dictionary<int, TimeType> time_types = ParseTimesTypes (buffer, 44 + 4 * timecnt + timecnt, typecnt, abbreviations);
938 List<KeyValuePair<DateTime, TimeType>> transitions = ParseTransitions (buffer, 44, timecnt, time_types);
940 if (time_types.Count == 0)
941 throw new InvalidTimeZoneException ();
943 if (time_types.Count == 1 && ((TimeType)time_types[0]).IsDst)
944 throw new InvalidTimeZoneException ();
946 TimeSpan baseUtcOffset = new TimeSpan (0);
947 TimeSpan dstDelta = new TimeSpan (0);
948 string standardDisplayName = null;
949 string daylightDisplayName = null;
950 bool dst_observed = false;
951 DateTime dst_start = DateTime.MinValue;
952 List<AdjustmentRule> adjustmentRules = new List<AdjustmentRule> ();
954 for (int i = 0; i < transitions.Count; i++) {
955 var pair = transitions [i];
956 DateTime ttime = pair.Key;
957 TimeType ttype = pair.Value;
959 if (standardDisplayName != ttype.Name || baseUtcOffset.TotalSeconds != ttype.Offset) {
960 standardDisplayName = ttype.Name;
961 daylightDisplayName = null;
962 baseUtcOffset = new TimeSpan (0, 0, ttype.Offset);
963 adjustmentRules = new List<AdjustmentRule> ();
964 dst_observed = false;
967 //FIXME: check additional fields for this:
968 //most of the transitions are expressed in GMT
969 dst_start += baseUtcOffset;
970 DateTime dst_end = ttime + baseUtcOffset + dstDelta;
972 //some weird timezone (America/Phoenix) have end dates on Jan 1st
973 if (dst_end.Date == new DateTime (dst_end.Year, 1, 1) && dst_end.Year > dst_start.Year)
974 dst_end -= new TimeSpan (24, 0, 0);
976 DateTime dateStart, dateEnd;
977 if (dst_start.Month < 7)
978 dateStart = new DateTime (dst_start.Year, 1, 1);
980 dateStart = new DateTime (dst_start.Year, 7, 1);
982 if (dst_end.Month >= 7)
983 dateEnd = new DateTime (dst_end.Year, 12, 31);
985 dateEnd = new DateTime (dst_end.Year, 6, 30);
988 TransitionTime transition_start = TransitionTime.CreateFixedDateRule (new DateTime (1, 1, 1) + dst_start.TimeOfDay, dst_start.Month, dst_start.Day);
989 TransitionTime transition_end = TransitionTime.CreateFixedDateRule (new DateTime (1, 1, 1) + dst_end.TimeOfDay, dst_end.Month, dst_end.Day);
990 if (transition_start != transition_end) //y, that happened in Argentina in 1943-1946
991 adjustmentRules.Add (AdjustmentRule.CreateAdjustmentRule (dateStart, dateEnd, dstDelta, transition_start, transition_end));
993 dst_observed = false;
995 if (daylightDisplayName != ttype.Name || dstDelta.TotalSeconds != ttype.Offset - baseUtcOffset.TotalSeconds) {
996 daylightDisplayName = ttype.Name;
997 dstDelta = new TimeSpan(0, 0, ttype.Offset) - baseUtcOffset;
1000 dst_observed = true;
1004 if (adjustmentRules.Count == 0) {
1005 TimeType t = (TimeType)time_types [0];
1006 if (standardDisplayName == null) {
1007 standardDisplayName = t.Name;
1008 baseUtcOffset = new TimeSpan (0, 0, t.Offset);
1010 return CreateCustomTimeZone (id, baseUtcOffset, id, standardDisplayName);
1012 return CreateCustomTimeZone (id, baseUtcOffset, id, standardDisplayName, daylightDisplayName, ValidateRules (adjustmentRules).ToArray ());
1016 static Dictionary<int, string> ParseAbbreviations (byte [] buffer, int index, int count)
1018 var abbrevs = new Dictionary<int, string> ();
1019 int abbrev_index = 0;
1020 var sb = new StringBuilder ();
1021 for (int i = 0; i < count; i++) {
1022 char c = (char) buffer [index + i];
1026 abbrevs.Add (abbrev_index, sb.ToString ());
1027 //Adding all the substrings too, as it seems to be used, at least for Africa/Windhoek
1028 for (int j = 1; j < sb.Length; j++)
1029 abbrevs.Add (abbrev_index + j, sb.ToString (j, sb.Length - j));
1030 abbrev_index = i + 1;
1031 sb = new StringBuilder ();
1037 static Dictionary<int, TimeType> ParseTimesTypes (byte [] buffer, int index, int count, Dictionary<int, string> abbreviations)
1039 var types = new Dictionary<int, TimeType> (count);
1040 for (int i = 0; i < count; i++) {
1041 int offset = ReadBigEndianInt32 (buffer, index + 6 * i);
1042 byte is_dst = buffer [index + 6 * i + 4];
1043 byte abbrev = buffer [index + 6 * i + 5];
1044 types.Add (i, new TimeType (offset, (is_dst != 0), abbreviations [(int)abbrev]));
1049 static List<KeyValuePair<DateTime, TimeType>> ParseTransitions (byte [] buffer, int index, int count, Dictionary<int, TimeType> time_types)
1051 var list = new List<KeyValuePair<DateTime, TimeType>> (count);
1052 for (int i = 0; i < count; i++) {
1053 int unixtime = ReadBigEndianInt32 (buffer, index + 4 * i);
1054 DateTime ttime = DateTimeFromUnixTime (unixtime);
1055 byte ttype = buffer [index + 4 * count + i];
1056 list.Add (new KeyValuePair<DateTime, TimeType> (ttime, time_types [(int)ttype]));
1061 static DateTime DateTimeFromUnixTime (long unix_time)
1063 DateTime date_time = new DateTime (1970, 1, 1);
1064 return date_time.AddSeconds (unix_time);
1069 public readonly int Offset;
1070 public readonly bool IsDst;
1073 public TimeType (int offset, bool is_dst, string abbrev)
1075 this.Offset = offset;
1076 this.IsDst = is_dst;
1080 public override string ToString ()
1082 return "offset: " + Offset + "s, is_dst: " + IsDst + ", zone name: " + Name;