dst

I have a GUI that plots time-series graphs. The user enters the dates they want to plot from and to by entering values in text boxes. For example, if they enter 25/07/13 22:00 and 26/07/13 00:00 the graph should plot data from 22:00:00 on the 25th through to 00:00:59 the following morning. The times the user enters are parsed into a Calendar object. My problem comes with DST. The user doesn't care about DST, so all they want to see is a graph between those two times. However, the Calendar objects do care about DST and so my "to" date is currently not 00:00, but 01:00. (I am in London and we

I have a Java Date that is from this summer during daylight savings time. For example: Jun 01, 2009 06:00 AM PDT My question is, how do I display this date as my local time zone and current daylight savings mode (in my case Pacific Standard Time)? Jun 01, 2009 05:00 AM PST Java's Date.toString() and SimpleDateFormat displays the date in the original daylight savings mode. Example: System.out.println(new Date(1243861200000L)); outputs: Mon Jun 01 06:00:00 PDT 2009 DateFormat dateFormat = new SimpleDateFormat("MMM dd, yyyy hh:mm aa zzz"); dateFormat.setTimeZone(TimeZone.getTimeZone("PST"));

I am using SimpleDateFormat with RFC 1123 to format dates, and to parse dates. However, parse(format(date)) is sometimes one hour different from the original date. The code below: public static void main(String[] args) throws ParseException { String RFC1123_DATE_PATTERN = "EEE, dd MMM yyyy HH:mm:ss zzz"; SimpleDateFormat dateFormat = new SimpleDateFormat(RFC1123_DATE_PATTERN); Date date = new Date(1000); String str = dateFormat.format(date); Date date2 = dateFormat.parse(str); System.out.println("date="+date+"; "+date.getTime()); System.out.println("str="+str); System.out.println("date2="

I need to change DST and time zone via API in my application. I modified & copied example of "SetTimeZoneInformation" usage by the end of the following link and have run it: http://msdn.microsoft.com/en-us/library/windows/desktop/ms724944(v=vs.85).aspx I am assuming that my time settings should reflect on my time settings in tray or control panel. But nothing happens. Following thing also should be noticed. This code modifies "HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation" key content. And there are no changes in "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\my time

I need to find an easy way to know if the local machine's 'automatically adjust clock for Daylight Saving Time' option is enabled. If the option's on, I need to know whether it is currently applied (i.e. is it DST currently in the system). Thanks in advance Jon Skeet You can find the current system default time zone and whether it is currently using DST (Daylight Saving Time) like this (.NET 3.5 onwards): TimeZoneInfo zone = TimeZoneInfo.Local; if (zone.SupportsDaylightSavingTime) { Console.WriteLine("System default zone uses DST..."); Console.WriteLine("In DST? {0}", zone.IsDaylightSavingTime

Today encountered interesting feature (?) in PHP DateTime::setTimestamp() behavior. During winter DST changes, when 1 hour repeats twice, PHP converts timestamp to always be the second hour. Consider following example: <?php $date = new \DateTime("now", new \DateTimeZone("UTC")); //2018-10-28T01:30:00 UTC, in London DST happens $date->setTimestamp(1540686600); echo $date->getTimestamp() . "\n"; //1540686600 echo $date->format('c') . "\n"; //2018-10-28T00:30:00+00:00 $date->setTimezone(new \DateTimeZone("Europe/London")); echo $date->getTimestamp() . "\n"; //1540690200 $date->setTimezone(new

I have an android app that has a service witch fires an alert based on some time calculation. The problem is when the timezone changes ( i.e.: For a user who's located France and goes from UTC+1 to UTC+2 ). The application is not notified about this change and so, it fires the alert with a delay. I have already checked android TimeZone API and know that there are some methods which can help, like: useDaylightTime() inDaylightTime(Date time) getDSTSavings() IS IT POSSIBLE to know when the change will happen, in order to consider it in my calculation algorithm? BTW: I already checked a lot of