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My single-page javascript app retrieves data in JSON format via REST calls. Dates come formatted using the UTC timezone in standard ISO8601 format, such as 2011-02-04T19:31:09Z . When signing up for the service, users select their timezone from a drop down list. This timezone could be different than the user's browser's timezone. The javascript app knows what the user's selected timezone is at all times. I know how to convert the UTC string into a date. I understand that Javascript only represents dates in the local timezone. But I'm having troubles figuring out how to display a date formatted

I have a Postgres table of clock alarms (not really, but this is analogous, and easier to explain). Alarms are set by users with a 1 hour resolution, and users can be from many different timezones. The alarms are repeating daily. I want to reliably fetch the alarms that are supposed to go off at a particular hour of the day, and I am having problems with daylight saving time . How do I do this in the best way? Example Alfred and Lotta both live in Stockholm (+1 hour from UTC, but +2h when it's DST). Sharon lives in Singapore (+8 hours from UTC, no DST) During winter, Alfred sets an alarm for 4

I run an application as a service on a server and then I have multiple clients connect to that service. I display the exact server time on each of the client Window form application and because of that I need a mechanism to detect any time change on the server so that I can send it to the client to display. Looking over the MSDN I found SystemEvents.TimeChanged , I thought I'm in luck because when testing with the code below with Visual Studio everything works great: SystemEvents.TimeChanged += new EventHandler(SystemEvents_TimeChanged); static void SystemEvents_TimeChanged(object sender,

I tried to calculate the difference between two dates and I noticed one thing. When calculating only the days, the start of daylight saving time is included in the interval, so the result will be shorter with 1 day. To obtain accurate results, the value of hours also must be considered. For example: SimpleDateFormat format = new SimpleDateFormat("MM-dd-yyyy"); Date dfrom = format.parse("03-29-2015"); Date dto = format.parse("03-30-2015"); long diff = dto.getTime() - dfrom.getTime(); System.out.println(diff); System.out.println("Days: "+diff / (24 * 60 * 60 * 1000)); System.out.println("Hours: