Microsoft app utc clock3/14/2023 ![]() The bias, standardBias and daylightBias fields follow the rules for the corresponding members of the Win32 TIME_ZONE_INFORMATION structure: UTC = local bias. The structure is defined as follows:Ĭopy Code It contains the offset from UTC, the additional offset for daylight savings, and the start and end dates for daylight savings. Name for the zone outside daylight savings May be related to Win95 clickable time zone map. Name for the zone during daylight savings (GMT) Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London Each subkey has the following values (examples taken from the GMT Standard Time key): Value ![]() Under this key are the subkeys describing each time zone. Windows NT's time zone database is stored in the registry, at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones. A route of investigation would be to inspect the implementation of System.TimeZone in the Shared Source CLI. I have not yet done that as some of the features ( GetDaylightChanges, IsDaylightSavingTime) will be difficult to implement, due to the apparent lack of OS support. This class is abstract, so could be extended. However, it does not offer any information about other time zones - what their names are, their offsets, or their daylight savings rules. This class offers information about the current time zone. NET's base class library offers the System.TimeZone class. In addition, Windows provides APIs for discovering the currently selected time zone, for converting from UTC to a specified time zone's local time, and (Windows XP and Server 2003 only) for converting from local time, in a specified zone, to UTC.NET APIs Unfortunately, Microsoft failed to provide an API for querying this database. Fortunately, Windows has a database of time zone information installed on every system. Local administrations make rules about the local offset from UTC, and about whether to observe daylight savings, and if so, when. Keeping an accurate record of the time zones used around the world is a hard task. Even when they do, they do not agree on the dates and times at which the changes to and from Daylight Savings occur. The issue is complicated by the Daylight Savings Time some locations observe daylight savings whereas others do not. ![]() GMT can describe the time zone used in Britain, or a specific offset (UTC 0). The simplest description is an offset from UTC - Universal Time (Coordinated) - although often erroneously described as an offset from GMT - Greenwich Mean Time. Time zonesĭifferent countries and locations around the world use different time zones - to match the time shown on a clock with the approximate local time observed. It could also be useful for working out when a Webcast, for example, occurs in your local time zone. The accompanying application, a demonstration of the TimeZoneInformation class, is useful here. This article is an attempt to provide code that is useful for converting a time stamp into the end-user's own time zone.Īnother group of users also need to deal with the time zones: travelers wishing to know the time at their destination, or the time at home - for example, when trying to call relatives or colleagues. I suggested a route forward but failed to convince the administrators. Some users were complaining that the site was not indicating the posting time accurately. This article was spurred by discussions on the Channel 9 forums around the time of the daylight changes this year.
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