nstimezone

I'm trying to work with dates and create dates in the future, but daylight savings keeps getting in the way and messing up my times. Here is my code to move to midnight of the first day of the next month for a date: + (NSDate *)firstDayOfNextMonthForDate:(NSDate*)date { NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; calendar.timeZone = [NSTimeZone systemTimeZone]; calendar.locale = [NSLocale currentLocale]; NSDate *currentDate = [NSDate dateByAddingMonths:1 toDate:date]; NSDateComponents *components = [calendar components:NSYearCalendarUnit |

I have created a calendar in my app, using the date object this way: NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *weekdayComponents = [gregorian components:(NSDayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSMinuteCalendarUnit)fromDate:[NSDate date]]; NSInteger day = [weekdayComponents day]; NSInteger month = [weekdayComponents month]; NSInteger year = [weekdayComponents year]; m_dateFormatter.dateFormat = @"dd/MM/yyyy"; [gregorian setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; NSDateComponents

I got current GMT time - 2013-05-15 08:55 AM my current local time is - 2013-05-15 02:06 PM and time zone is - Asia/Kolkata I tried to convert the above GMT to my local time with this code NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"Asia/Kolkata"]; [dateFormatter setTimeZone:sourceTimeZone]; // timeStamp - is the above GMT time NSDate *dateFromString = [dateFormatter dateFromString:timeStamp]; NSLog(@"local time is %@",dateFromString); but this give me wron time as - 2013-05-14 19:04:00 +0000 instead of 2013-05-14 02:06 PM Why this happens? please help me to clear this

I'm initializing my NSDateFormatter thusly: NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; [dateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"] autorelease]]; [dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm:ss z"]; [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; NSDate *date = [NSDate date]; NSString *dateString = [dateFormatter stringFromDate:date]; dateString is now: Thu, 29 Jul 2010 14:58:42 GMT+00:00 I want to get rid of the "+00:00" I'm guessing from http://unicode.org/reports/tr35/tr35-6.html#Time

How do I get the raw offset in milliseconds for Coordinated Universal Time in iOS programmatically? NSInteger millisecondsFromGMT = 1000 * [[NSTimeZone localTimeZone] secondsFromGMT]; In Swift 3 and Swift 4: let millisecondsFromGmt = 1000 * TimeZone.autoupdatingCurrent.secondsFromGMT() schmidt9 Please see answer to my question: https://stackoverflow.com/a/31988549/3004003 It seems to be more precise regarding expression raw offset , because "raw" actually should mean "without DST at all", like it is in Java ( getRawOffset() in java.util.TimeZone class) 来源： https://stackoverflow.com/questions

I use timeZoneWithName, but I don't know names of timezones. Where can I find a list of timezones? [NSTimeZone timeZoneWithName:@"US/Eastern"]; I found solution. NSLog(@"%@", [NSTimeZone knownTimeZoneNames]); 来源： https://stackoverflow.com/questions/9761847/where-can-i-find-a-list-of-timezones

I have a doubt that I cannot understand why is the way it is and I appeal to the Gods of this site :) I have a date coming like this: "1982-01-01T00:00:00Z" As I'm displaying whatever the server sends (I know, customer requirement, not good practice...), I'm forcing the device to have that TimeZone with the following method, simplified without error checking, not optimized, and all that kind of things: + (NSString *) yearStringFromDate: (NSDate *) date { NSDateFormatter *formatter = [NSDateFormatter new]; [formatter setDateFormat:@"YYYY"]; [formatter setTimeZone:[self timezoneForSIHF]]; return

This code NSCalendar *calendar =[NSCalendar currentCalendar]; [gregorian setTimeZone:tz]; NSLog(@"%@", [gregorian timeZone]); NSDateComponents *comp = [gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit) fromDate:[NSDate date]]; [comp setDay:info.day]; [comp setMonth:info.month]; [comp setYear:info.year]; [comp setHour:info.hour]; [comp setMinute:info.minute]; [comp setSecond:info.second]; [comp setTimeZone:tz]; NSLog(@"%@", [comp timeZone]); NSLog(@"%@", [gregorian dateFromComponents:comp]); shows the following in console: Europe/Moscow (MSKS) offset 14400 (Daylight) Europe/Moscow

I found out that iOS framework doesn’t understand proper time zone names, like "Eastern Standard Time”. If you type: NSLog(@"EST: %@", [NSTimeZone timeZoneWithName:@"Eastern Standard Time"]); … you get: EST: (null) Instead, you have to use time ID:s (a narrower area), like "America/New_York" for example: NSLog(@"EST: %@", [NSTimeZone timeZoneWithName:@"America/New_York"]); ... then the console kindly responds: EST: America/New_York (GMT-4) offset -14400 (Daylight) Is there any way to translate time zone names to time ID:s? Because the web-API I’m using is giving me time zone names, not the