dst

How to check if in Denmark daylight time savings has taken effect, if so, then add 1 hour to my data, else not? I have a xml file: <day = "1" month = "5" sunrise ="06:30" sunset ="21:30" /> Think you need convert this xml to DateTime and then use TimeZoneInfo class. If Denmark your local time: DateTime thisTime = DateTime.Now; bool isDaylight = TimeZoneInfo.Local.IsDaylightSavingTime(thisTime); Else you need to get Denmark TimeZone: DateTime thisTime = DateTime.Now; // get Denmark Standard Time zone - not sure about that TimeZoneInfo tst = TimeZoneInfo.FindSystemTimeZoneById("Denmark Standard

I have a rails time-based query which has some odd timezone sensitive behaviour, even though as far as I know I'm using UTC. In a nutshell, these queries give different answers: >> Model.find(:all,:conditions=>['created_at<=?',(Time.now-1.hours).gmtime]).length => 279 >> Model.find(:all,:conditions=>['created_at<=?',(Time.now-1.hours)]).length => 280 Where the DB actually does contain one model created in the last hour, and the total number of models is 280. So only the first query is correct. However, in environment.rb I have: config.time_zone = 'UTC' The system time zone (as reported by

I couldn't find a similar question around, so here it goes. I need to create some alerts and basically identify when a daylight saving time approaches, i.e. next thursday daylight begins Question How does Timezone knows the correct info? I ask that because, for instance, in my country - Brazil - the day is defined one year before when it will happen by government. It could potentially not even exist on a specific year. This probably happens in other countries as well. On Java Doc , the below info can be found: This method returns a historically correct offset value if an underlying TimeZone

I want to determine the if daylight saving time is active or not, but in a region different to where my server is located. My problem is I want to check the daylight saving of London and my server is in Canada; is it possible to find the daylight saving of a different time zone? You need to deploy a table of DST and look up the DST time for the region you want. DST are published by various organizations and refreshed periodically. What you need to understand is that DST cannot be determined by an algorithm, it can only be looked up as is set by various legislative bodies for various regions,

I'm seeing some behavior I don't understand with Javascript date objects and DST transitions. If I execute the following in Chrome's javascript console var date = new Date(1268535600000); //2010-03-14T03:00:00.000Z (21:00 03-13 America/Chicago) for(var i = 1; i <= 12; i++) { var time = date.getHours(); console.log(time) console.log(date) date.setHours(date.getHours() + 1); } the output is: 21 Sat Mar 13 2010 21:00:00 GMT-0600 (Central Standard Time) 22 Sat Mar 13 2010 22:00:00 GMT-0600 (Central Standard Time) 23 Sat Mar 13 2010 23:00:00 GMT-0600 (Central Standard Time) 0 Sun Mar 14 2010 00:00