Question

我的时间本地时间字符串 2014-12-20 16:30:00 GMT + 5:30 ，我需要将同一时间转换为不同的区域 2014-12 -20 16:30:00 GMT + 2:30 然后想要同时转换 2014-12-20 16:30:00 GMT + 2：3 0到UTC为< strong> 2014-12-20 14:00:00 as string。

NSDateFormatter *df2 = [[NSDateFormatter alloc] init];
df2.dateStyle = NSDateFormatterMediumStyle;
[df2 setDateFormat:@"YYYY-MM-dd HH:mm:ss z"];

[df2 setTimeZone:[NSTimeZone timeZoneWithName:timezonename]];
 start_date=[df2 stringFromDate:datepick.date];

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"YYYY-MM-dd HH:mm:ss z'"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:timezonename]];
NSDate *dte = [dateFormat dateFromString:start_date];

NSLog(@"Date: %@--%@",start_date, dte);

请帮忙...

提前致谢..

Answer 1

您可以使用此代码。可能对你有帮助。

NSDate sourceDate = Yourdate;

NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithName:@"Australia/Melbourne"];

NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone]; // your device time . you can also change any time zone like above.

NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];

NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;

NSDate* destinationDate = [[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate];

Answer 2

-(NSDate*)convertThisDate:(NSDate*)aDate
           toThisTimeZone:(NSString*)timeZoneAbbreviation{


    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSDate *yourDate = [NSDate date];

    NSString *yourDateAsString = [dateFormatter stringFromDate:yourDate];

    [dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:timeZoneAbbreviation]];

    NSDate *convertedDate = [dateFormatter dateFromString:yourDateAsString];


    NSLog(@"convertedDate : %@",convertedDate);

    return convertedDate;

}

//For Local Timezone
-(NSDate*)convertThisDateToLocalTimeZone:(NSDate*)aDate{


    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSDate *yourDate = [NSDate date];

    NSString *yourDateAsString = [dateFormatter stringFromDate:yourDate];

    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];//current local time zone in device

    NSDate *convertedDate = [dateFormatter dateFromString:yourDateAsString];


    NSLog(@"convertedDate : %@",convertedDate);

    return convertedDate;

}

<强>用法：

    NSDate *UTCDate = [self convertThisDate:myDate
                             toThisTimeZone:@"UTC"];

    NSDate *GMTDate = [self convertThisDate:myDate
                             toThisTimeZone:@"GMT"];

    NSDate *ESTDate = [self convertThisDate:myDate
                             toThisTimeZone:@"EST"];

    //For Local Timezone
    NSDate *localTimeZoneDate = [self convertThisDateToLocalTimeZone:myDate];

要获取支持的缩写列表，您可以将NSLog作为时区列表

NSLog(@"TimeZone List: %@", [NSTimeZone abbreviationDictionary]);

TimeZone List: {
    ADT = "America/Halifax";
    AKDT = "America/Juneau";
    AKST = "America/Juneau";
    ART = "America/Argentina/Buenos_Aires";
    AST = "America/Halifax";
    BDT = "Asia/Dhaka";
    BRST = "America/Sao_Paulo";
    BRT = "America/Sao_Paulo";
    BST = "Europe/London";
    CAT = "Africa/Harare";
    CDT = "America/Chicago";
    CEST = "Europe/Paris";
    CET = "Europe/Paris";
    CLST = "America/Santiago";
    CLT = "America/Santiago";
    COT = "America/Bogota";
    CST = "America/Chicago";
    EAT = "Africa/Addis_Ababa";
    EDT = "America/New_York";
    EEST = "Europe/Istanbul";
    EET = "Europe/Istanbul";
    EST = "America/New_York";
    GMT = GMT;
    GST = "Asia/Dubai";
    HKT = "Asia/Hong_Kong";
    HST = "Pacific/Honolulu";
    ICT = "Asia/Bangkok";
    IRST = "Asia/Tehran";
    IST = "Asia/Calcutta";
    JST = "Asia/Tokyo";
    KST = "Asia/Seoul";
    MDT = "America/Denver";
    MSD = "Europe/Moscow";
    MSK = "Europe/Moscow";
    MST = "America/Denver";
    NZDT = "Pacific/Auckland";
    NZST = "Pacific/Auckland";
    PDT = "America/Los_Angeles";
    PET = "America/Lima";
    PHT = "Asia/Manila";
    PKT = "Asia/Karachi";
    PST = "America/Los_Angeles";
    SGT = "Asia/Singapore";
    UTC = UTC;
    WAT = "Africa/Lagos";
    WEST = "Europe/Lisbon";
    WET = "Europe/Lisbon";
    WIT = "Asia/Jakarta";
}

Answer 3

使用timeZoneForSecondsFromGMT中的NSTimeZone并为timezone设置NSDateFormatter。

NSString *dateString = @"2014-12-20 16:30:00 GMT+5:30";
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];

// For GMT + 2.30, seconds will be 7200 (2 hours) + 1800 (30 minutes)
// For GMT + 5.30, seconds will be 18000 (5 hours) + 1800 (30 minutes)
// 60 seconds * 60 minutes * 5 hours + 60 seconds * 30 minutes
NSTimeZone *timeZone = [NSTimeZone timeZoneForSecondsFromGMT:19800];
[formatter setTimeZone:timeZone];

NSDate *date =[formatter dateFromString:dateString]; 
NSString *newTimeZoneDateString = [formatter stringFromDate:date];
NSLog(@"%@",newTimeZoneDateString1);

Xcode-不同的时间转换为UTC

3 个答案: