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There were quite a few questions about saving datetime & timezones info in DB but more on the overall level. Here I'd like to address a specific case. System specs We have an Orders system database It is a multi-tenant system where tenants can use arbitrary timezone (it is arbitrary but single timezone per tenant, saved in Tenants table once and never changes) Business rule needed to be covered in DB When tenant places an Order into the system, order number gets computed based on their local datetime (its not literally a number but some kind of an identifier like ORDR-13432-Year-Month-Day ).

I would like to determine a time offset to GMT/UTC (including daylight saving time) for different countries at a specific date in VBA. Any ideas? EDIT (from self-answer): Thank you 0xA3. I quickly read-over the linked page. I assume that you can only get the offset to GMT for the local where windows is running: ConvertLocalToGMT DaylightTime GetLocalTimeFromGMT LocalOffsetFromGMT SystemTimeToVBTime LocalOffsetFromGMT In Java you can do the following: TimeZone bucharestTimeZone = TimeZone.getTimeZone("Europe/Bucharest"); bucharestTimeZone.getOffset(new Date().getTime()); Calendar nowInBucharest

If daylight saving time is in effect, and a date object has been saved into the database (UTC format) which you retrieve to show it in the view (for example the view in asp.net-mvc ). And you do that by using this method: public static DateTime ConvertToLocalTimeFromUtcTime(DateTime utcDate, string timeZoneId) { TimeZoneInfo localZone = TimeZoneInfo.FindSystemTimeZoneById(timeZoneId); DateTime localTime = TimeZoneInfo.ConvertTimeFromUtc(utcDate, localZone); if (localZone.IsDaylightSavingTime(localTime)) localTime = localTime.AddHours(1); // is this needed !? return localTime; } The question is

I have a UTC DateTime value coming from a database record. I also have a user-specified time zone (an instance of TimeZoneInfo). How do I convert that UTC DateTime to the user's local time zone? Also, how do I determine if the user-specified time zone is currently observing DST? I'm using .NET 3.5. Thanks, Mark Have a look at the DateTimeOffset structure: // user-specified time zone TimeZoneInfo southPole = TimeZoneInfo.FindSystemTimeZoneById("Antarctica/South Pole Standard Time"); // an UTC DateTime DateTime utcTime = new DateTime(2007, 07, 12, 06, 32, 00, DateTimeKind.Utc); // DateTime with

I have a Java class that takes in the latitude/longitude of a location and returns the GMT offset when daylight savings time is on and off. I am looking for an easy way to determine in Java if the current date is in daylight savings time so I can apply the correct offset. Currently I am only performing this calculation for U.S. timezones although eventually I would like to expand this to global timezones as well. Clint This is the answer for the machine on which the question is being asked: TimeZone.getDefault().inDaylightTime( new Date() ); A server trying to figure this out for a client will

I'd like to know the simplest way, in Java, to get a list of dates in the future where daylight savings time will change. One rather inellegant way to do this would be to simply iterate over a bunch of years' worth of days, testing them against TimeZone.inDaylightTime(). This will work, and I'm not worried about efficiency since this will only need to run every time my app starts, but I wonder if there's a simpler way. If you're wondering why I'm doing this, it's because I have a javascript app which needs to handle third-party data containing UTC timestamps. I want a reliable way to translate