6 * Stephane Delcroix <stephane@delcroix.org>
8 * Copyright 2011 Xamarin Inc.
10 * Permission is hereby granted, free of charge, to any person obtaining
11 * a copy of this software and associated documentation files (the
12 * "Software"), to deal in the Software without restriction, including
13 * without limitation the rights to use, copy, modify, merge, publish,
14 * distribute, sublicense, and/or sell copies of the Software, and to
15 * permit persons to whom the Software is furnished to do so, subject to
16 * the following conditions:
18 * The above copyright notice and this permission notice shall be
19 * included in all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Runtime.CompilerServices;
32 using System.Threading;
34 #if !INSIDE_CORLIB && NET_4_0
36 [assembly:TypeForwardedTo (typeof(TimeZoneInfo))]
38 #elif (INSIDE_CORLIB && NET_4_0) || (!INSIDE_CORLIB && (NET_3_5 && !NET_4_0 && !MOBILE))
40 using System.Collections.Generic;
41 using System.Collections.ObjectModel;
42 using System.Runtime.Serialization;
50 using Microsoft.Win32;
55 [TypeForwardedFrom (Consts.AssemblySystem_Core)]
57 [TypeForwardedFrom (Consts.AssemblySystemCore_3_5)]
59 [SerializableAttribute]
60 public sealed partial class TimeZoneInfo : IEquatable<TimeZoneInfo>, ISerializable, IDeserializationCallback
62 TimeSpan baseUtcOffset;
63 public TimeSpan BaseUtcOffset {
64 get { return baseUtcOffset; }
67 string daylightDisplayName;
68 public string DaylightName {
70 return supportsDaylightSavingTime
77 public string DisplayName {
78 get { return displayName; }
86 static TimeZoneInfo local;
87 public static TimeZoneInfo Local {
93 throw new TimeZoneNotFoundException ();
95 if (Interlocked.CompareExchange (ref local, l, null) != null)
103 static TimeZoneInfo CreateLocal ()
106 return AndroidTimeZones.Default;
108 using (Stream stream = GetMonoTouchData (null)) {
109 return BuildFromStream ("Local", stream);
113 return FindSystemTimeZoneByFileName ("Local", "/etc/localtime");
116 return FindSystemTimeZoneByFileName ("Local", Path.Combine (TimeZoneDirectory, "localtime"));
122 if (IsWindows && LocalZoneKey != null) {
123 string name = (string)LocalZoneKey.GetValue ("TimeZoneKeyName");
124 name = TrimSpecial (name);
126 return TimeZoneInfo.FindSystemTimeZoneById (name);
133 string standardDisplayName;
134 public string StandardName {
135 get { return standardDisplayName; }
138 bool supportsDaylightSavingTime;
139 public bool SupportsDaylightSavingTime {
140 get { return supportsDaylightSavingTime; }
143 static TimeZoneInfo utc;
144 public static TimeZoneInfo Utc {
147 utc = CreateCustomTimeZone ("UTC", new TimeSpan (0), "UTC", "UTC");
152 static string timeZoneDirectory;
153 static string TimeZoneDirectory {
155 if (timeZoneDirectory == null)
156 timeZoneDirectory = "/usr/share/zoneinfo";
157 return timeZoneDirectory;
161 timeZoneDirectory = value;
165 private AdjustmentRule [] adjustmentRules;
169 /// Determine whether windows of not (taken Stephane Delcroix's code)
171 private static bool IsWindows
174 int platform = (int) Environment.OSVersion.Platform;
175 return ((platform != 4) && (platform != 6) && (platform != 128));
180 /// Needed to trim misc garbage in MS registry keys
182 private static string TrimSpecial (string str)
185 while (Istart < str.Length && !char.IsLetterOrDigit(str[Istart])) Istart++;
186 var Iend = str.Length - 1;
187 while (Iend > Istart && !char.IsLetterOrDigit(str[Iend])) Iend--;
189 return str.Substring (Istart, Iend-Istart+1);
192 static RegistryKey timeZoneKey;
193 static RegistryKey TimeZoneKey {
195 if (timeZoneKey != null)
200 return timeZoneKey = Registry.LocalMachine.OpenSubKey (
201 "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones",
206 static RegistryKey localZoneKey;
207 static RegistryKey LocalZoneKey {
209 if (localZoneKey != null)
215 return localZoneKey = Registry.LocalMachine.OpenSubKey (
216 "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation", false);
221 public static void ClearCachedData ()
225 systemTimeZones = null;
228 public static DateTime ConvertTime (DateTime dateTime, TimeZoneInfo destinationTimeZone)
230 return ConvertTime (dateTime, dateTime.Kind == DateTimeKind.Utc ? TimeZoneInfo.Utc : TimeZoneInfo.Local, destinationTimeZone);
233 public static DateTime ConvertTime (DateTime dateTime, TimeZoneInfo sourceTimeZone, TimeZoneInfo destinationTimeZone)
235 if (sourceTimeZone == null)
236 throw new ArgumentNullException ("sourceTimeZone");
238 if (destinationTimeZone == null)
239 throw new ArgumentNullException ("destinationTimeZone");
241 if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone != TimeZoneInfo.Local)
242 throw new ArgumentException ("Kind property of dateTime is Local but the sourceTimeZone does not equal TimeZoneInfo.Local");
244 if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone != TimeZoneInfo.Utc)
245 throw new ArgumentException ("Kind property of dateTime is Utc but the sourceTimeZone does not equal TimeZoneInfo.Utc");
247 if (sourceTimeZone.IsInvalidTime (dateTime))
248 throw new ArgumentException ("dateTime parameter is an invalid time");
250 if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone == TimeZoneInfo.Local && destinationTimeZone == TimeZoneInfo.Local)
253 DateTime utc = ConvertTimeToUtc (dateTime);
255 if (destinationTimeZone != TimeZoneInfo.Utc) {
256 utc = ConvertTimeFromUtc (utc, destinationTimeZone);
257 if (dateTime.Kind == DateTimeKind.Unspecified)
258 return DateTime.SpecifyKind (utc, DateTimeKind.Unspecified);
264 public static DateTimeOffset ConvertTime(DateTimeOffset dateTimeOffset, TimeZoneInfo destinationTimeZone)
266 if (destinationTimeZone == null)
267 throw new ArgumentNullException("destinationTimeZone");
269 var utcDateTime = dateTimeOffset.UtcDateTime;
270 AdjustmentRule rule = destinationTimeZone.GetApplicableRule (utcDateTime);
272 if (rule != null && destinationTimeZone.IsDaylightSavingTime(utcDateTime)) {
273 var offset = destinationTimeZone.BaseUtcOffset + rule.DaylightDelta;
274 return new DateTimeOffset(DateTime.SpecifyKind(utcDateTime, DateTimeKind.Unspecified) + offset, offset);
277 return new DateTimeOffset(DateTime.SpecifyKind(utcDateTime, DateTimeKind.Unspecified) + destinationTimeZone.BaseUtcOffset, destinationTimeZone.BaseUtcOffset);
281 public static DateTime ConvertTimeBySystemTimeZoneId (DateTime dateTime, string destinationTimeZoneId)
283 return ConvertTime (dateTime, FindSystemTimeZoneById (destinationTimeZoneId));
286 public static DateTime ConvertTimeBySystemTimeZoneId (DateTime dateTime, string sourceTimeZoneId, string destinationTimeZoneId)
288 return ConvertTime (dateTime, FindSystemTimeZoneById (sourceTimeZoneId), FindSystemTimeZoneById (destinationTimeZoneId));
291 public static DateTimeOffset ConvertTimeBySystemTimeZoneId (DateTimeOffset dateTimeOffset, string destinationTimeZoneId)
293 return ConvertTime (dateTimeOffset, FindSystemTimeZoneById (destinationTimeZoneId));
296 private DateTime ConvertTimeFromUtc (DateTime dateTime)
298 if (dateTime.Kind == DateTimeKind.Local)
299 throw new ArgumentException ("Kind property of dateTime is Local");
301 if (this == TimeZoneInfo.Utc)
302 return DateTime.SpecifyKind (dateTime, DateTimeKind.Utc);
304 //FIXME: do not rely on DateTime implementation !
305 if (this == TimeZoneInfo.Local)
308 return dateTime.ToLocalTime ();
310 return DateTime.SpecifyKind (dateTime.ToLocalTime (), DateTimeKind.Unspecified);
315 AdjustmentRule rule = GetApplicableRule (dateTime);
316 if (rule != null && IsDaylightSavingTime (DateTime.SpecifyKind (dateTime, DateTimeKind.Utc)))
317 return DateTime.SpecifyKind (dateTime + BaseUtcOffset + rule.DaylightDelta , DateTimeKind.Unspecified);
319 return DateTime.SpecifyKind (dateTime + BaseUtcOffset, DateTimeKind.Unspecified);
322 public static DateTime ConvertTimeFromUtc (DateTime dateTime, TimeZoneInfo destinationTimeZone)
324 if (destinationTimeZone == null)
325 throw new ArgumentNullException ("destinationTimeZone");
327 return destinationTimeZone.ConvertTimeFromUtc (dateTime);
330 public static DateTime ConvertTimeToUtc (DateTime dateTime)
332 if (dateTime.Kind == DateTimeKind.Utc)
335 //FIXME: do not rely on DateTime implementation !
336 return DateTime.SpecifyKind (dateTime.ToUniversalTime (), DateTimeKind.Utc);
339 public static DateTime ConvertTimeToUtc (DateTime dateTime, TimeZoneInfo sourceTimeZone)
341 if (sourceTimeZone == null)
342 throw new ArgumentNullException ("sourceTimeZone");
344 if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone != TimeZoneInfo.Utc)
345 throw new ArgumentException ("Kind property of dateTime is Utc but the sourceTimeZone does not equal TimeZoneInfo.Utc");
347 if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone != TimeZoneInfo.Local)
348 throw new ArgumentException ("Kind property of dateTime is Local but the sourceTimeZone does not equal TimeZoneInfo.Local");
350 if (sourceTimeZone.IsInvalidTime (dateTime))
351 throw new ArgumentException ("dateTime parameter is an invalid time");
353 if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone == TimeZoneInfo.Utc)
356 if (dateTime.Kind == DateTimeKind.Utc)
359 if (dateTime.Kind == DateTimeKind.Local)
360 return ConvertTimeToUtc (dateTime);
362 if (sourceTimeZone.IsAmbiguousTime (dateTime) || !sourceTimeZone.IsDaylightSavingTime (dateTime))
363 return DateTime.SpecifyKind (dateTime - sourceTimeZone.BaseUtcOffset, DateTimeKind.Utc);
365 AdjustmentRule rule = sourceTimeZone.GetApplicableRule (dateTime);
367 return DateTime.SpecifyKind (dateTime - sourceTimeZone.BaseUtcOffset - rule.DaylightDelta, DateTimeKind.Utc);
369 return DateTime.SpecifyKind (dateTime - sourceTimeZone.BaseUtcOffset, DateTimeKind.Utc);
373 public static TimeZoneInfo CreateCustomTimeZone (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName)
375 return CreateCustomTimeZone (id, baseUtcOffset, displayName, standardDisplayName, null, null, true);
378 public static TimeZoneInfo CreateCustomTimeZone (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules)
380 return CreateCustomTimeZone (id, baseUtcOffset, displayName, standardDisplayName, daylightDisplayName, adjustmentRules, false);
383 public static TimeZoneInfo CreateCustomTimeZone ( string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules, bool disableDaylightSavingTime)
385 return new TimeZoneInfo (id, baseUtcOffset, displayName, standardDisplayName, daylightDisplayName, adjustmentRules, disableDaylightSavingTime);
389 public override bool Equals (object obj)
391 return Equals (obj as TimeZoneInfo);
395 public bool Equals (TimeZoneInfo other)
400 return other.Id == this.Id && HasSameRules (other);
403 public static TimeZoneInfo FindSystemTimeZoneById (string id)
405 //FIXME: this method should check for cached values in systemTimeZones
407 throw new ArgumentNullException ("id");
409 if (TimeZoneKey != null)
411 RegistryKey key = TimeZoneKey.OpenSubKey (id, false);
413 throw new TimeZoneNotFoundException ();
414 return FromRegistryKey(id, key);
418 var timeZoneInfo = AndroidTimeZones.GetTimeZone (id);
419 if (timeZoneInfo == null)
420 throw new TimeZoneNotFoundException ();
423 // Local requires special logic that already exists in the Local property (bug #326)
427 using (Stream stream = GetMonoTouchData (id)) {
428 return BuildFromStream (id, stream);
431 string filepath = Path.Combine (TimeZoneDirectory, id);
432 return FindSystemTimeZoneByFileName (id, filepath);
434 throw new NotImplementedException ();
440 private static TimeZoneInfo FindSystemTimeZoneByFileName (string id, string filepath)
442 if (!File.Exists (filepath))
443 throw new TimeZoneNotFoundException ();
445 using (FileStream stream = File.OpenRead (filepath)) {
446 return BuildFromStream (id, stream);
450 #if LIBC || MONOTOUCH
451 const int BUFFER_SIZE = 16384; //Big enough for any tz file (on Oct 2008, all tz files are under 10k)
453 private static TimeZoneInfo BuildFromStream (string id, Stream stream)
455 byte [] buffer = new byte [BUFFER_SIZE];
456 int length = stream.Read (buffer, 0, BUFFER_SIZE);
458 if (!ValidTZFile (buffer, length))
459 throw new InvalidTimeZoneException ("TZ file too big for the buffer");
462 return ParseTZBuffer (id, buffer, length);
463 } catch (Exception e) {
464 throw new InvalidTimeZoneException (e.Message);
470 private static TimeZoneInfo FromRegistryKey (string id, RegistryKey key)
472 byte [] reg_tzi = (byte []) key.GetValue ("TZI");
475 throw new InvalidTimeZoneException ();
477 int bias = BitConverter.ToInt32 (reg_tzi, 0);
478 TimeSpan baseUtcOffset = new TimeSpan (0, -bias, 0);
480 string display_name = (string) key.GetValue ("Display");
481 string standard_name = (string) key.GetValue ("Std");
482 string daylight_name = (string) key.GetValue ("Dlt");
484 List<AdjustmentRule> adjustmentRules = new List<AdjustmentRule> ();
486 RegistryKey dst_key = key.OpenSubKey ("Dynamic DST", false);
487 if (dst_key != null) {
488 int first_year = (int) dst_key.GetValue ("FirstEntry");
489 int last_year = (int) dst_key.GetValue ("LastEntry");
492 for (year=first_year; year<=last_year; year++) {
493 byte [] dst_tzi = (byte []) dst_key.GetValue (year.ToString ());
494 if (dst_tzi != null) {
495 int start_year = year == first_year ? 1 : year;
496 int end_year = year == last_year ? 9999 : year;
497 ParseRegTzi(adjustmentRules, start_year, end_year, dst_tzi);
502 ParseRegTzi(adjustmentRules, 1, 9999, reg_tzi);
504 return CreateCustomTimeZone (id, baseUtcOffset, display_name, standard_name, daylight_name, ValidateRules (adjustmentRules).ToArray ());
507 private static void ParseRegTzi (List<AdjustmentRule> adjustmentRules, int start_year, int end_year, byte [] buffer)
509 //int standard_bias = BitConverter.ToInt32 (buffer, 4); /* not sure how to handle this */
510 int daylight_bias = BitConverter.ToInt32 (buffer, 8);
512 int standard_year = BitConverter.ToInt16 (buffer, 12);
513 int standard_month = BitConverter.ToInt16 (buffer, 14);
514 int standard_dayofweek = BitConverter.ToInt16 (buffer, 16);
515 int standard_day = BitConverter.ToInt16 (buffer, 18);
516 int standard_hour = BitConverter.ToInt16 (buffer, 20);
517 int standard_minute = BitConverter.ToInt16 (buffer, 22);
518 int standard_second = BitConverter.ToInt16 (buffer, 24);
519 int standard_millisecond = BitConverter.ToInt16 (buffer, 26);
521 int daylight_year = BitConverter.ToInt16 (buffer, 28);
522 int daylight_month = BitConverter.ToInt16 (buffer, 30);
523 int daylight_dayofweek = BitConverter.ToInt16 (buffer, 32);
524 int daylight_day = BitConverter.ToInt16 (buffer, 34);
525 int daylight_hour = BitConverter.ToInt16 (buffer, 36);
526 int daylight_minute = BitConverter.ToInt16 (buffer, 38);
527 int daylight_second = BitConverter.ToInt16 (buffer, 40);
528 int daylight_millisecond = BitConverter.ToInt16 (buffer, 42);
530 if (standard_month == 0 || daylight_month == 0)
534 DateTime start_timeofday = new DateTime (1, 1, 1, daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
535 TransitionTime start_transition_time;
537 if (daylight_year == 0) {
538 start_date = new DateTime (start_year, 1, 1);
539 start_transition_time = TransitionTime.CreateFloatingDateRule (
540 start_timeofday, daylight_month, daylight_day,
541 (DayOfWeek) daylight_dayofweek);
544 start_date = new DateTime (daylight_year, daylight_month, daylight_day,
545 daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
546 start_transition_time = TransitionTime.CreateFixedDateRule (
547 start_timeofday, daylight_month, daylight_day);
551 DateTime end_timeofday = new DateTime (1, 1, 1, standard_hour, standard_minute, standard_second, standard_millisecond);
552 TransitionTime end_transition_time;
554 if (standard_year == 0) {
555 end_date = new DateTime (end_year, 12, 31);
556 end_transition_time = TransitionTime.CreateFloatingDateRule (
557 end_timeofday, standard_month, standard_day,
558 (DayOfWeek) standard_dayofweek);
561 end_date = new DateTime (standard_year, standard_month, standard_day,
562 standard_hour, standard_minute, standard_second, standard_millisecond);
563 end_transition_time = TransitionTime.CreateFixedDateRule (
564 end_timeofday, standard_month, standard_day);
567 TimeSpan daylight_delta = new TimeSpan(0, -daylight_bias, 0);
569 adjustmentRules.Add (AdjustmentRule.CreateAdjustmentRule (
570 start_date, end_date, daylight_delta,
571 start_transition_time, end_transition_time));
575 public AdjustmentRule [] GetAdjustmentRules ()
577 if (!supportsDaylightSavingTime)
578 return new AdjustmentRule [0];
580 return (AdjustmentRule []) adjustmentRules.Clone ();
583 public TimeSpan [] GetAmbiguousTimeOffsets (DateTime dateTime)
585 if (!IsAmbiguousTime (dateTime))
586 throw new ArgumentException ("dateTime is not an ambiguous time");
588 AdjustmentRule rule = GetApplicableRule (dateTime);
590 return new TimeSpan[] {baseUtcOffset, baseUtcOffset + rule.DaylightDelta};
592 return new TimeSpan[] {baseUtcOffset, baseUtcOffset};
595 public TimeSpan [] GetAmbiguousTimeOffsets (DateTimeOffset dateTimeOffset)
597 if (!IsAmbiguousTime (dateTimeOffset))
598 throw new ArgumentException ("dateTimeOffset is not an ambiguous time");
600 throw new NotImplementedException ();
603 public override int GetHashCode ()
605 int hash_code = Id.GetHashCode ();
606 foreach (AdjustmentRule rule in GetAdjustmentRules ())
607 hash_code ^= rule.GetHashCode ();
612 void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
614 public void GetObjectData (SerializationInfo info, StreamingContext context)
618 throw new ArgumentNullException ("info");
619 info.AddValue ("Id", id);
620 info.AddValue ("DisplayName", displayName);
621 info.AddValue ("StandardName", standardDisplayName);
622 info.AddValue ("DaylightName", daylightDisplayName);
623 info.AddValue ("BaseUtcOffset", baseUtcOffset);
624 info.AddValue ("AdjustmentRules", adjustmentRules);
625 info.AddValue ("SupportsDaylightSavingTime", SupportsDaylightSavingTime);
628 //FIXME: change this to a generic Dictionary and allow caching for FindSystemTimeZoneById
629 private static List<TimeZoneInfo> systemTimeZones;
630 public static ReadOnlyCollection<TimeZoneInfo> GetSystemTimeZones ()
632 if (systemTimeZones == null) {
633 systemTimeZones = new List<TimeZoneInfo> ();
635 if (TimeZoneKey != null) {
636 foreach (string id in TimeZoneKey.GetSubKeyNames ()) {
638 systemTimeZones.Add (FindSystemTimeZoneById (id));
642 return new ReadOnlyCollection<TimeZoneInfo> (systemTimeZones);
646 foreach (string id in AndroidTimeZones.GetAvailableIds ()) {
647 var tz = AndroidTimeZones.GetTimeZone (id);
649 systemTimeZones.Add (tz);
652 if (systemTimeZones.Count == 0) {
653 foreach (string name in GetMonoTouchNames ()) {
654 using (Stream stream = GetMonoTouchData (name)) {
655 systemTimeZones.Add (BuildFromStream (name, stream));
660 string[] continents = new string [] {"Africa", "America", "Antarctica", "Arctic", "Asia", "Atlantic", "Brazil", "Canada", "Chile", "Europe", "Indian", "Mexico", "Mideast", "Pacific", "US"};
661 foreach (string continent in continents) {
663 foreach (string zonepath in Directory.GetFiles (Path.Combine (TimeZoneDirectory, continent))) {
665 string id = String.Format ("{0}/{1}", continent, Path.GetFileName (zonepath));
666 systemTimeZones.Add (FindSystemTimeZoneById (id));
667 } catch (ArgumentNullException) {
668 } catch (TimeZoneNotFoundException) {
669 } catch (InvalidTimeZoneException) {
670 } catch (Exception) {
677 throw new NotImplementedException ("This method is not implemented for this platform");
680 return new ReadOnlyCollection<TimeZoneInfo> (systemTimeZones);
683 public TimeSpan GetUtcOffset (DateTime dateTime)
685 if (IsDaylightSavingTime (dateTime)) {
686 AdjustmentRule rule = GetApplicableRule (dateTime);
688 return BaseUtcOffset + rule.DaylightDelta;
691 return BaseUtcOffset;
694 public TimeSpan GetUtcOffset (DateTimeOffset dateTimeOffset)
696 throw new NotImplementedException ();
699 public bool HasSameRules (TimeZoneInfo other)
702 throw new ArgumentNullException ("other");
704 if ((this.adjustmentRules == null) != (other.adjustmentRules == null))
707 if (this.adjustmentRules == null)
710 if (this.BaseUtcOffset != other.BaseUtcOffset)
713 if (this.adjustmentRules.Length != other.adjustmentRules.Length)
716 for (int i = 0; i < adjustmentRules.Length; i++) {
717 if (! (this.adjustmentRules [i]).Equals (other.adjustmentRules [i]))
724 public bool IsAmbiguousTime (DateTime dateTime)
726 if (dateTime.Kind == DateTimeKind.Local && IsInvalidTime (dateTime))
727 throw new ArgumentException ("Kind is Local and time is Invalid");
729 if (this == TimeZoneInfo.Utc)
732 if (dateTime.Kind == DateTimeKind.Utc)
733 dateTime = ConvertTimeFromUtc (dateTime);
735 if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Local)
736 dateTime = ConvertTime (dateTime, TimeZoneInfo.Local, this);
738 AdjustmentRule rule = GetApplicableRule (dateTime);
740 DateTime tpoint = TransitionPoint (rule.DaylightTransitionEnd, dateTime.Year);
741 if (dateTime > tpoint - rule.DaylightDelta && dateTime <= tpoint)
748 public bool IsAmbiguousTime (DateTimeOffset dateTimeOffset)
750 throw new NotImplementedException ();
753 bool IsInDSTForYear (AdjustmentRule rule, DateTime dateTime, int year)
755 DateTime DST_start = TransitionPoint (rule.DaylightTransitionStart, year);
756 DateTime DST_end = TransitionPoint (rule.DaylightTransitionEnd, year + ((rule.DaylightTransitionStart.Month < rule.DaylightTransitionEnd.Month) ? 0 : 1));
757 if (dateTime.Kind == DateTimeKind.Utc) {
758 DST_start -= BaseUtcOffset;
759 DST_end -= (BaseUtcOffset + rule.DaylightDelta);
762 return (dateTime >= DST_start && dateTime < DST_end);
765 public bool IsDaylightSavingTime (DateTime dateTime)
767 if (dateTime.Kind == DateTimeKind.Local && IsInvalidTime (dateTime))
768 throw new ArgumentException ("dateTime is invalid and Kind is Local");
770 if (this == TimeZoneInfo.Utc)
773 if (!SupportsDaylightSavingTime)
776 //FIXME: do not rely on DateTime implementation !
777 if ((dateTime.Kind == DateTimeKind.Local || dateTime.Kind == DateTimeKind.Unspecified) && this == TimeZoneInfo.Local)
778 return dateTime.IsDaylightSavingTime ();
780 //FIXME: do not rely on DateTime implementation !
781 if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Utc)
782 return IsDaylightSavingTime (DateTime.SpecifyKind (dateTime.ToUniversalTime (), DateTimeKind.Utc));
784 AdjustmentRule rule = GetApplicableRule (dateTime.Date);
788 // Check whether we're in the dateTime year's DST period
789 if (IsInDSTForYear (rule, dateTime, dateTime.Year))
792 // We might be in the dateTime previous year's DST period
793 return IsInDSTForYear (rule, dateTime, dateTime.Year - 1);
796 public bool IsDaylightSavingTime (DateTimeOffset dateTimeOffset)
798 throw new NotImplementedException ();
801 public bool IsInvalidTime (DateTime dateTime)
803 if (dateTime.Kind == DateTimeKind.Utc)
805 if (dateTime.Kind == DateTimeKind.Local && this != Local)
808 AdjustmentRule rule = GetApplicableRule (dateTime);
810 DateTime tpoint = TransitionPoint (rule.DaylightTransitionStart, dateTime.Year);
811 if (dateTime >= tpoint && dateTime < tpoint + rule.DaylightDelta)
819 void IDeserializationCallback.OnDeserialization (object sender)
821 public void OnDeserialization (object sender)
825 TimeZoneInfo.Validate (id, baseUtcOffset, adjustmentRules);
826 } catch (ArgumentException ex) {
827 throw new SerializationException ("invalid serialization data", ex);
831 private static void Validate (string id, TimeSpan baseUtcOffset, AdjustmentRule [] adjustmentRules)
834 throw new ArgumentNullException ("id");
836 if (id == String.Empty)
837 throw new ArgumentException ("id parameter is an empty string");
839 if (baseUtcOffset.Ticks % TimeSpan.TicksPerMinute != 0)
840 throw new ArgumentException ("baseUtcOffset parameter does not represent a whole number of minutes");
842 if (baseUtcOffset > new TimeSpan (14, 0, 0) || baseUtcOffset < new TimeSpan (-14, 0, 0))
843 throw new ArgumentOutOfRangeException ("baseUtcOffset parameter is greater than 14 hours or less than -14 hours");
847 throw new ArgumentException ("id parameter shouldn't be longer than 32 characters");
850 if (adjustmentRules != null && adjustmentRules.Length != 0) {
851 AdjustmentRule prev = null;
852 foreach (AdjustmentRule current in adjustmentRules) {
854 throw new InvalidTimeZoneException ("one or more elements in adjustmentRules are null");
856 if ((baseUtcOffset + current.DaylightDelta < new TimeSpan (-14, 0, 0)) ||
857 (baseUtcOffset + current.DaylightDelta > new TimeSpan (14, 0, 0)))
858 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;");
860 if (prev != null && prev.DateStart > current.DateStart)
861 throw new InvalidTimeZoneException ("adjustment rules specified in adjustmentRules parameter are not in chronological order");
863 if (prev != null && prev.DateEnd > current.DateStart)
864 throw new InvalidTimeZoneException ("some adjustment rules in the adjustmentRules parameter overlap");
866 if (prev != null && prev.DateEnd == current.DateStart)
867 throw new InvalidTimeZoneException ("a date can have multiple adjustment rules applied to it");
874 public override string ToString ()
879 private TimeZoneInfo (SerializationInfo info, StreamingContext context)
882 throw new ArgumentNullException ("info");
883 id = (string) info.GetValue ("Id", typeof (string));
884 displayName = (string) info.GetValue ("DisplayName", typeof (string));
885 standardDisplayName = (string) info.GetValue ("StandardName", typeof (string));
886 daylightDisplayName = (string) info.GetValue ("DaylightName", typeof (string));
887 baseUtcOffset = (TimeSpan) info.GetValue ("BaseUtcOffset", typeof (TimeSpan));
888 adjustmentRules = (TimeZoneInfo.AdjustmentRule []) info.GetValue ("AdjustmentRules", typeof (TimeZoneInfo.AdjustmentRule []));
889 supportsDaylightSavingTime = (bool) info.GetValue ("SupportsDaylightSavingTime", typeof (bool));
892 private TimeZoneInfo (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules, bool disableDaylightSavingTime)
895 throw new ArgumentNullException ("id");
897 if (id == String.Empty)
898 throw new ArgumentException ("id parameter is an empty string");
900 if (baseUtcOffset.Ticks % TimeSpan.TicksPerMinute != 0)
901 throw new ArgumentException ("baseUtcOffset parameter does not represent a whole number of minutes");
903 if (baseUtcOffset > new TimeSpan (14, 0, 0) || baseUtcOffset < new TimeSpan (-14, 0, 0))
904 throw new ArgumentOutOfRangeException ("baseUtcOffset parameter is greater than 14 hours or less than -14 hours");
908 throw new ArgumentException ("id parameter shouldn't be longer than 32 characters");
911 bool supportsDaylightSavingTime = !disableDaylightSavingTime;
913 if (adjustmentRules != null && adjustmentRules.Length != 0) {
914 AdjustmentRule prev = null;
915 foreach (AdjustmentRule current in adjustmentRules) {
917 throw new InvalidTimeZoneException ("one or more elements in adjustmentRules are null");
919 if ((baseUtcOffset + current.DaylightDelta < new TimeSpan (-14, 0, 0)) ||
920 (baseUtcOffset + current.DaylightDelta > new TimeSpan (14, 0, 0)))
921 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;");
923 if (prev != null && prev.DateStart > current.DateStart)
924 throw new InvalidTimeZoneException ("adjustment rules specified in adjustmentRules parameter are not in chronological order");
926 if (prev != null && prev.DateEnd > current.DateStart)
927 throw new InvalidTimeZoneException ("some adjustment rules in the adjustmentRules parameter overlap");
929 if (prev != null && prev.DateEnd == current.DateStart)
930 throw new InvalidTimeZoneException ("a date can have multiple adjustment rules applied to it");
935 supportsDaylightSavingTime = false;
939 this.baseUtcOffset = baseUtcOffset;
940 this.displayName = displayName ?? id;
941 this.standardDisplayName = standardDisplayName ?? id;
942 this.daylightDisplayName = daylightDisplayName;
943 this.supportsDaylightSavingTime = supportsDaylightSavingTime;
944 this.adjustmentRules = adjustmentRules;
947 private AdjustmentRule GetApplicableRule (DateTime dateTime)
949 //Transitions are always in standard time
950 DateTime date = dateTime;
952 if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Local)
953 date = date.ToUniversalTime () + BaseUtcOffset;
955 if (dateTime.Kind == DateTimeKind.Utc && this != TimeZoneInfo.Utc)
956 date = date + BaseUtcOffset;
958 if (adjustmentRules != null) {
959 foreach (AdjustmentRule rule in adjustmentRules) {
960 if (rule.DateStart > date.Date)
962 if (rule.DateEnd < date.Date)
970 private static DateTime TransitionPoint (TransitionTime transition, int year)
972 if (transition.IsFixedDateRule)
973 return new DateTime (year, transition.Month, transition.Day) + transition.TimeOfDay.TimeOfDay;
975 DayOfWeek first = (new DateTime (year, transition.Month, 1)).DayOfWeek;
976 int day = 1 + (transition.Week - 1) * 7 + (transition.DayOfWeek - first) % 7;
977 if (day > DateTime.DaysInMonth (year, transition.Month))
981 return new DateTime (year, transition.Month, day) + transition.TimeOfDay.TimeOfDay;
984 static List<AdjustmentRule> ValidateRules (List<AdjustmentRule> adjustmentRules)
986 AdjustmentRule prev = null;
987 foreach (AdjustmentRule current in adjustmentRules.ToArray ()) {
988 if (prev != null && prev.DateEnd > current.DateStart) {
989 adjustmentRules.Remove (current);
993 return adjustmentRules;
996 #if LIBC || MONODROID
997 private static bool ValidTZFile (byte [] buffer, int length)
999 StringBuilder magic = new StringBuilder ();
1001 for (int i = 0; i < 4; i++)
1002 magic.Append ((char)buffer [i]);
1004 if (magic.ToString () != "TZif")
1007 if (length >= BUFFER_SIZE)
1013 static int SwapInt32 (int i)
1015 return (((i >> 24) & 0xff)
1016 | ((i >> 8) & 0xff00)
1017 | ((i << 8) & 0xff0000)
1021 static int ReadBigEndianInt32 (byte [] buffer, int start)
1023 int i = BitConverter.ToInt32 (buffer, start);
1024 if (!BitConverter.IsLittleEndian)
1027 return SwapInt32 (i);
1030 private static TimeZoneInfo ParseTZBuffer (string id, byte [] buffer, int length)
1032 //Reading the header. 4 bytes for magic, 16 are reserved
1033 int ttisgmtcnt = ReadBigEndianInt32 (buffer, 20);
1034 int ttisstdcnt = ReadBigEndianInt32 (buffer, 24);
1035 int leapcnt = ReadBigEndianInt32 (buffer, 28);
1036 int timecnt = ReadBigEndianInt32 (buffer, 32);
1037 int typecnt = ReadBigEndianInt32 (buffer, 36);
1038 int charcnt = ReadBigEndianInt32 (buffer, 40);
1040 if (length < 44 + timecnt * 5 + typecnt * 6 + charcnt + leapcnt * 8 + ttisstdcnt + ttisgmtcnt)
1041 throw new InvalidTimeZoneException ();
1043 Dictionary<int, string> abbreviations = ParseAbbreviations (buffer, 44 + 4 * timecnt + timecnt + 6 * typecnt, charcnt);
1044 Dictionary<int, TimeType> time_types = ParseTimesTypes (buffer, 44 + 4 * timecnt + timecnt, typecnt, abbreviations);
1045 List<KeyValuePair<DateTime, TimeType>> transitions = ParseTransitions (buffer, 44, timecnt, time_types);
1047 if (time_types.Count == 0)
1048 throw new InvalidTimeZoneException ();
1050 if (time_types.Count == 1 && ((TimeType)time_types[0]).IsDst)
1051 throw new InvalidTimeZoneException ();
1053 TimeSpan baseUtcOffset = new TimeSpan (0);
1054 TimeSpan dstDelta = new TimeSpan (0);
1055 string standardDisplayName = null;
1056 string daylightDisplayName = null;
1057 bool dst_observed = false;
1058 DateTime dst_start = DateTime.MinValue;
1059 List<AdjustmentRule> adjustmentRules = new List<AdjustmentRule> ();
1061 for (int i = 0; i < transitions.Count; i++) {
1062 var pair = transitions [i];
1063 DateTime ttime = pair.Key;
1064 TimeType ttype = pair.Value;
1066 if (standardDisplayName != ttype.Name || baseUtcOffset.TotalSeconds != ttype.Offset) {
1067 standardDisplayName = ttype.Name;
1068 daylightDisplayName = null;
1069 baseUtcOffset = new TimeSpan (0, 0, ttype.Offset);
1070 adjustmentRules = new List<AdjustmentRule> ();
1071 dst_observed = false;
1074 //FIXME: check additional fields for this:
1075 //most of the transitions are expressed in GMT
1076 dst_start += baseUtcOffset;
1077 DateTime dst_end = ttime + baseUtcOffset + dstDelta;
1079 //some weird timezone (America/Phoenix) have end dates on Jan 1st
1080 if (dst_end.Date == new DateTime (dst_end.Year, 1, 1) && dst_end.Year > dst_start.Year)
1081 dst_end -= new TimeSpan (24, 0, 0);
1083 DateTime dateStart, dateEnd;
1084 if (dst_start.Month < 7)
1085 dateStart = new DateTime (dst_start.Year, 1, 1);
1087 dateStart = new DateTime (dst_start.Year, 7, 1);
1089 if (dst_end.Month >= 7)
1090 dateEnd = new DateTime (dst_end.Year, 12, 31);
1092 dateEnd = new DateTime (dst_end.Year, 6, 30);
1095 TransitionTime transition_start = TransitionTime.CreateFixedDateRule (new DateTime (1, 1, 1) + dst_start.TimeOfDay, dst_start.Month, dst_start.Day);
1096 TransitionTime transition_end = TransitionTime.CreateFixedDateRule (new DateTime (1, 1, 1) + dst_end.TimeOfDay, dst_end.Month, dst_end.Day);
1097 if (transition_start != transition_end) //y, that happened in Argentina in 1943-1946
1098 adjustmentRules.Add (AdjustmentRule.CreateAdjustmentRule (dateStart, dateEnd, dstDelta, transition_start, transition_end));
1100 dst_observed = false;
1102 if (daylightDisplayName != ttype.Name || dstDelta.TotalSeconds != ttype.Offset - baseUtcOffset.TotalSeconds) {
1103 daylightDisplayName = ttype.Name;
1104 dstDelta = new TimeSpan(0, 0, ttype.Offset) - baseUtcOffset;
1107 dst_observed = true;
1111 if (adjustmentRules.Count == 0) {
1112 TimeType t = (TimeType)time_types [0];
1113 if (standardDisplayName == null) {
1114 standardDisplayName = t.Name;
1115 baseUtcOffset = new TimeSpan (0, 0, t.Offset);
1117 return CreateCustomTimeZone (id, baseUtcOffset, id, standardDisplayName);
1119 return CreateCustomTimeZone (id, baseUtcOffset, id, standardDisplayName, daylightDisplayName, ValidateRules (adjustmentRules).ToArray ());
1123 static Dictionary<int, string> ParseAbbreviations (byte [] buffer, int index, int count)
1125 var abbrevs = new Dictionary<int, string> ();
1126 int abbrev_index = 0;
1127 var sb = new StringBuilder ();
1128 for (int i = 0; i < count; i++) {
1129 char c = (char) buffer [index + i];
1133 abbrevs.Add (abbrev_index, sb.ToString ());
1134 //Adding all the substrings too, as it seems to be used, at least for Africa/Windhoek
1135 for (int j = 1; j < sb.Length; j++)
1136 abbrevs.Add (abbrev_index + j, sb.ToString (j, sb.Length - j));
1137 abbrev_index = i + 1;
1138 sb = new StringBuilder ();
1144 static Dictionary<int, TimeType> ParseTimesTypes (byte [] buffer, int index, int count, Dictionary<int, string> abbreviations)
1146 var types = new Dictionary<int, TimeType> (count);
1147 for (int i = 0; i < count; i++) {
1148 int offset = ReadBigEndianInt32 (buffer, index + 6 * i);
1149 byte is_dst = buffer [index + 6 * i + 4];
1150 byte abbrev = buffer [index + 6 * i + 5];
1151 types.Add (i, new TimeType (offset, (is_dst != 0), abbreviations [(int)abbrev]));
1156 static List<KeyValuePair<DateTime, TimeType>> ParseTransitions (byte [] buffer, int index, int count, Dictionary<int, TimeType> time_types)
1158 var list = new List<KeyValuePair<DateTime, TimeType>> (count);
1159 for (int i = 0; i < count; i++) {
1160 int unixtime = ReadBigEndianInt32 (buffer, index + 4 * i);
1161 DateTime ttime = DateTimeFromUnixTime (unixtime);
1162 byte ttype = buffer [index + 4 * count + i];
1163 list.Add (new KeyValuePair<DateTime, TimeType> (ttime, time_types [(int)ttype]));
1168 static DateTime DateTimeFromUnixTime (long unix_time)
1170 DateTime date_time = new DateTime (1970, 1, 1);
1171 return date_time.AddSeconds (unix_time);
1176 public readonly int Offset;
1177 public readonly bool IsDst;
1180 public TimeType (int offset, bool is_dst, string abbrev)
1182 this.Offset = offset;
1183 this.IsDst = is_dst;
1187 public override string ToString ()
1189 return "offset: " + Offset + "s, is_dst: " + IsDst + ", zone name: " + Name;