You can also serialize a DateTimeOffset structure to represent a single point in time unambiguously. Converting individual time zones to UTC makes time comparisons easy. For details and other best practices using dates and times, see Coding best practices using DateTime in the. The use of UTC is recommended when a date and time's portability across computers is important. Thus, UTC provides a time-zone free or time-zone neutral time. The world's time zones are expressed as positive or negative offsets from UTC. Converting to Coordinated Universal TimeĬoordinated Universal Time (UTC) is a high-precision, atomic time standard. This article explains how to convert times from one time zone to another and convert DateTimeOffset values that have limited time zone awareness. For example, a web page that displays the current time in the eastern part of the United States will lack credibility to a customer in eastern Asia. An application can no longer assume that all times can be expressed in the local time, which is the time available from the DateTime structure. Example UsageĬonvert an IANA time zone name to the best fitting Windows time zone ID.It's becoming increasingly important for any application that works with dates and times to handle differences between time zones. The complete list is in the unit test code here. There are many zones that are unmappable to Rails. Therefore, if you try to convert Antarctica/Troll to Windows, you will get a TimeZoneNotFoundException. In other words, there is no "correct" time zone for Windows users who may happen to be stationed in Troll Station, Antarctica. It is possible for a zone to be unmappable - meaning that there is no logical equivalent from one type of time zone to another.Ĭurrently there is only one IANA zone that is unmappable to Windows, which is Antarctica/Troll. If it is then used on a Windows computer that does not yet have KB4051956 installed (which created this time zone), they will likely get a TimeZoneNotFoundException. It is assumed that the computer is kept current with time zone updates.įor example, if one attempts to convert Africa/Khartoum to a Windows time zone ID, they will get Sudan Standard Time. It is recommended that you always use the most current revision, and check for updates regularly.Īdditionally, this library does not attempt to determine if the time zone IDs provided are actually present on the computer where the code is running. Important: Since this data can change whenever new time zones are introduced from any of these sources, Or may not have been published to official sources yet. Usually, the latter is reserved for edge cases, and for newly-introduced zones that may The author's best-informed knowledge and opinions.The MAPPING data from ActiveSupport::TimeZone in the Rails source code.This library uses a combination of data sources to achieve its goals: ![]() NET Framework versions less than 4.6.2 are no longer supported.Īlso note that TimeZoneConverter.Posix takes a dependency on both TimeZoneConverter and Noda Time. You only need it if you require support for POSIX time zones.Īs of version 4.0.0, TimeZoneConverter.Posix works with all of the following: This is a separate helper library that is maintained in the same repository. PM > Install-Package TimeZoneConverter.Posix See dotnet/dotnet-docker#1366 for instructions on how to add it to your Docker images. ![]() If your environment does not have the tzdata package installed, you will need to install it for TZConvert.GetTimeZoneInfo to work correctly.įor example, the Alpine Linux Docker images for. On OSX and Linux, this data comes from a distribution of the IANA time zone database, usually via the tzdata package. On Windows, this data comes from the registry and is maintained via Windows Updates. Some functions in TimeZoneConverter, such as TZConvert.GetTimeZoneInfo rely on the underlying TimeZoneInfo object having access to ![]() All of the data it needs is embedded in the library itself. TimeZoneConverter has no external data dependencies at runtime. However, it is indeed still supported, and many have found it continues to be useful in certain environments or on specific platforms. NET 6 (or higher), and you have either platform-provided or App-local ICU enabled, you might not need to use this library. NET's ICU integration to perform this functionality. NET 6 has built-in support for IANA and Windows time zones in a cross-platform manner, somewhat reducing the need for this library. NET Framework versions less than 4.6.2 are no longer supported. As of version 6.0.0, TimeZoneConverter works with all of the following:
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