#TIME ZONES LIST FREE#
If you have even better use-cases for this hint, feel free to leave a comment below. The AT TIME ZONE hint is very useful when trying to figure out when something actually happened, especially during that lag time. There is a period of time every year when the Daylight Saving Time changeover lags by a week depending on where you are in the world. SELECT AS AT TIME ZONE 'GMT Standard Time' Īs expected, the result is 16:00:00 +01:00. Now we can take the result of that and use it to see what the equivalent time is in GMT (which is one hour ahead of UTC during summer). The result will be returned as a DATETIMEOFFSET data type: 09:00:00 -06:00. Let’s get the local time in Calgary: DECLARE DATETIMEOFFSET = CAST(' 09:00:00' AS DATETIME2(0)) AT TIME ZONE 'Mountain Standard Time' Say that we want to know what the local time is in London, if it is 9am in Calgary on today, 5 September 2018, but we don’t know whether it’s still Daylight Saving Time in Calgary. Note that the results show the current offset from UTC time zone (when the query was run), as well as a BIT column representing the current Daylight Saving Time (DST) state.
#TIME ZONES LIST UPDATE#
If there is a change to a time zone for any reason, Microsoft will update this list through a Windows Update or Cumulative Update, depending on the platform.Īs of this writing (5 September 2018), the following time zones are available. This is the recommended method if you do not have access to the registry hive. We can also use a Transact-SQL (T-SQL) query against the system view sys.time_zone_info, which uses the information from the registry hive. Note: For SQL Server on Linux (and Docker containers), a registry shim performs the same function as the Windows registry by intercepting the API calls and returning the expected value(s). The timezone name is taken from a list maintained in the following Windows registry hive: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones Where Do We Find the List of Possible Time Zones? If the input value is not in one of the accepted formats, we can convert it using the CAST or CONVERT system functions. The result is output as a DATETIMEOFFSETdata type. The accepted input data types are SMALLDATETIME, DATETIME and DATETIME2. We can use this hint in a SELECT query, for example: SELECT inputdate AT TIME ZONE 'Name of destination time zone' For this use-case, we can use the AT TIME ZONE hint, which was introduced in SQL Server 2016. Sometimes though, it may be necessary to query data directly and see what the local date and time is, or calculate the date and time in another region. UTC is also sometimes called Z or Zulu time. UTC used to be called GMT (Greenwich Mean Time), after the Royal Observatory located in the Greenwich area of London. It is also advisable to store dates and times in UTC format on our on-premises SQL Server instances, and handle all time zone calculations at the presentation layer. Although many time zones have descriptive names used by people in them, they are least ambiguously identified by their relationship to UTC (Universal Time, Co-ordinated). In the Azure SQL Database, the regional settings of the database are set to UTC by default.
#TIME ZONES LIST SERIES#
Continuing the series on dates and times in SQL Server and Azure SQL Database, this week we look at the hint AT TIME ZONE.
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