ELSE DATEADD(hour, - 6, TimeUtc) - The normal hours difference between UTC and CSTĪLTER function. WHEN 1 THEN DATEADD(hour, - 5, TimeUtc) - because UTC doesn't observe DST. CASE _DaylightSavingTime_IsInEffect(TimeUtc) taking into account daylight saving time, you could do this: If you want to represent that time in our current central time, which is the universal time (aka Greenwich Mean Time or Zulu Time). Example usage: from a stored proc, you may have a table with a datetime field called TimeUtc, So, pass in the date AND time if you want to be very specific. first day of DST, but not yet 2 am (such as passing in the date at midnight), the returned result will NOTE: The other functions called here are specific to the time of day. Description: Returns a 1 or 0 for whether Daylight Saving Time is in effect for the date time passed in. Note that I have changed the names of your functions slightly, so that all three functions will begin the same way, and thus be grouped together in the list in SQL Server Management Studio: Thanks, Tim! I have encapsulated your "Sample Execution" part into a function, too, and have included comments for how it may be used by a stored proc that calls it. Savings Time setting saved, you can use theīitwise And operator to determine whether Daylight Savings Time should be compensatedįor in the time comparison. ![]() In addition, if you have the Time Zone and Daylight Then a simple comparison is made: if theĬurrent date is between and then set = 1, otherwise ![]() Respective dates using the two functions. Would extract the year from the current date, set and to their You would pass the currentĭate and time into the stored procedure, in which three variables are created: (smalldatetime), and tinyint. Your particular time zone (Eastern Time in our case). Set = '11/01/' + case 1 then 2 then 3 then 4 then 5 then 6 then 7 then example of where you could use this logic is in a stored procedure that gathersĭatabase entries from different time zones, but you need to convert the time to To determine the start date and end date: Start Date Function for Daylight Savings TimeĬREATE function. Here are the complete sets of Daylight Savings Time code If you don't need that kind of granularity then DATEADD(day,"DATE") Savings Time starts and ends at 02:00 I wanted the date returned from the function Of the month and find the first Sunday of March using a Case statementĭATEADD(hour,"DATE") function instead of DATEADD(day,"DATE"). End date: We evaluate the day of the week corresponding to the first day.Of the month and find the second Sunday of March using a Case statement Start date: We evaluate the day of the week corresponding to the first day.Once we have the first day of the month, the next step depends on what we're ![]() Or "11/01/" plus the year as the date, since we know that Daylight Savings TimeĪlways starts on the second Sunday of March and ends on the first Sunday of Next, we declare a smalldatetime variable with either '03/01/" plus the year The first step, obviously, is to pass the year you want the start and end This, I created functions that return the start and end dates for Daylight Savings Time as well as whether Daylight Savings Time is currently in effect. The reported time, I have to know whether the site participates in Daylight Savings In order to calculate the Eastern Time equivalent of Vendor software and our own monitoring software and have to account for time differences In our particular case we have discrepancies between
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