从UTC日历到具有适当本地 NSTimeZone 的日历的 Convert the date 。

此处输入是字符串currentUTCTime (格式为08/30/2012 11:11)将输入时间转换为系统设置的时区时间

//UTC time
NSDateFormatter *utcDateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[utcDateFormatter setDateFormat:@"MM/dd/yyyy HH:mm"];
[utcDateFormatter setTimeZone :[NSTimeZone timeZoneForSecondsFromGMT: 0]];
// utc format
NSDate *dateInUTC = [utcDateFormatter dateFromString: currentUTCTime];
// offset second
NSInteger seconds = [[NSTimeZone systemTimeZone] secondsFromGMT];
// format it and send
NSDateFormatter *localDateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[localDateFormatter setDateFormat:@"MM/dd/yyyy HH:mm"];
[localDateFormatter setTimeZone :[NSTimeZone timeZoneForSecondsFromGMT: seconds]];
// formatted string
NSString *localDate = [localDateFormatter stringFromDate: dateInUTC];
return localDate;

如果您想要本地日期和时间。尝试此代码：-

NSString *localDate = [NSDateFormatter localizedStringFromDate:[NSDate date] dateStyle:NSDateFormatterMediumStyle timeStyle:NSDateFormatterMediumStyle];

我发现的最简单的方法是：

NSDate *someDateInUTC = …;
NSTimeInterval timeZoneSeconds = [[NSTimeZone localTimeZone] secondsFromGMT];
NSDate *dateInLocalTimezone = [someDateInUTC dateByAddingTimeInterval:timeZoneSeconds];

由于似乎没有人在使用 NSDateComponents ，我想我应该加入一个……在这个版本中，没有使用 NSDateFormatter ，因此没有字符串解析，并且 NSDate 不用于表示格林尼治标准时间(协调世界时)之外的时间。原始 NSDate 在变量 i_date 中。

NSCalendar *anotherCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:i_anotherCalendar];
anotherCalendar.timeZone = [NSTimeZone timeZoneWithName:i_anotherTimeZone];
NSDateComponents *anotherComponents = [anotherCalendar components:(NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitNanosecond) fromDate:i_date];
// The following is just for checking   
anotherComponents.calendar = anotherCalendar; // anotherComponents.date is nil without this
NSDate *anotherDate = anotherComponents.date;

i_anotherCalendar 可以是 NSCalendarIdentifierGregorian 或任何其他日历。允许 i_anotherTimeZone 的 NSString 可以通过 [NSTimeZone knownTimeZoneNames] 获取，但 anotherCalendar.timeZone 可以是 [NSTimeZone defaultTimeZone] 、 [NSTimeZone localTimeZone] 或 [NSTimeZone systemTimeZone] 。

实际上是 anotherComponents 保存了新时区的时间。您将注意到 anotherDate 等于 i_date ，因为它以格林尼治时间(协调世界时)为单位。

将UTC时间转换为当前时区。

调用函数

NSLocale *locale = [NSLocale autoupdatingCurrentLocale];
NSString *myLanguageCode = [locale objectForKey: NSLocaleLanguageCode];
NSString *myCountryCode = [locale objectForKey: NSLocaleCountryCode];
NSString *rfc3339DateTimeString = @"2015-02-15 00:00:00"];
NSDate *myDateTime = (NSDate*)[_myCommonFunctions _ConvertUTCTimeToLocalTimeWithFormat:rfc3339DateTimeString LanguageCode:myLanguageCode CountryCode:myCountryCode Formated:NO];

函数

-NSObject*)_ConvertUTCTimeToLocalTimeWithFormat:rfc3339DateTimeString     LanguageCode:(NSString *)lgc CountryCode:(NSString *)ctc Formated:(BOOL) formated
    NSDateFormatter *sUserVisibleDateFormatter = nil;
    NSDateFormatter *sRFC3339DateFormatter = nil;
    NSTimeZone *timeZone = [NSTimeZone defaultTimeZone];
    if (sRFC3339DateFormatter == nil)
        sRFC3339DateFormatter = [[NSDateFormatter alloc] init];
        NSLocale *myPOSIXLocale = [[NSLocale alloc] initWithLocaleIdentifier:[NSString stringWithFormat:@"%@", timeZone]];
        [sRFC3339DateFormatter setLocale:myPOSIXLocale];
        [sRFC3339DateFormatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"];
        [sRFC3339DateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    // Convert the RFC 3339 date time string to an NSDate.
    NSDate *date = [sRFC3339DateFormatter dateFromString:rfc3339DateTimeString];
    if (formated == YES)
        NSString *userVisibleDateTimeString;
        if (date != nil)
            if (sUserVisibleDateFormatter == nil)
                sUserVisibleDateFormatter = [[NSDateFormatter alloc] init];
                [sUserVisibleDateFormatter setDateStyle:NSDateFormatterMediumStyle];
                [sUserVisibleDateFormatter setTimeStyle:NSDateFormatterShortStyle];
            // Convert the date object to a user-visible date string.
            userVisibleDateTimeString = [sUserVisibleDateFormatter stringFromDate:date];
            return (NSObject*)userVisibleDateTimeString;
    return (NSObject*)date;
}

我编写此方法将日期时间转换为我们的LocalTimeZone

-Here (NSString *)TimeZone参数是服务器时区

-(NSString *)convertTimeIntoLocal:(NSString *)defaultTime :(NSString *)TimeZone
    NSDateFormatter *serverFormatter = [[NSDateFormatter alloc] init];
    [serverFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:TimeZone]];
    [serverFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *theDate = [serverFormatter dateFromString:defaultTime];
    NSDateFormatter *userFormatter = [[NSDateFormatter alloc] init];
    [userFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    [userFormatter setTimeZone:[NSTimeZone localTimeZone]];
    NSString *dateConverted = [userFormatter stringFromDate:theDate];
    return dateConverted;
}

将UTC日期转换为本地日期

-(NSString *)getLocalDateTimeFromUTC:(NSString *)strDate
    NSDateFormatter *dtFormat = [[NSDateFormatter alloc] init];
    [dtFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    [dtFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
    NSDate *aDate = [dtFormat dateFromString:strDate];
    [dtFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    [dtFormat setTimeZone:[NSTimeZone systemTimeZone]];
    return [dtFormat stringFromDate:aDate];
}

像这样使用

NSString *localDate = [self getLocalDateTimeFromUTC:@"yourUTCDate"];

请使用此代码。

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss"]; 
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
NSDate *date = [dateFormatter dateFromString:@"2015-04-01T11:42:00"]; // create date from string
[dateFormatter setDateFormat:@"EEE, MMM d, yyyy - h:mm a"];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
NSString *timestamp = [dateFormatter stringFromDate:date];

SwiftDate 库解决方案：

// Take date by seconds in UTC time zone