iOS開發NSDate、NSString、時間戳記之間的轉化，nsdatensstring

iOS開發NSDate、NSString、時間戳記之間的轉化，nsdatensstring

  1 //將UTCDate(世界標準時間)轉化為當地時區的標準Date（鐘錶顯示的時間）  2 //NSDate *date = [NSDate date];   2018-03-27 06:54:41 +0000  3 //轉化後：2018-03-27 14:54:41 +0000  4 -(NSDate *)getLocalDateFromUTCDate:(NSDate *)UTCDate{  5       6     NSTimeZone *tz = [NSTimeZone defaultTimeZone];  7     NSInteger seconds = [tz secondsFromGMTForDate: UTCDate];  8     return [NSDate dateWithTimeInterval: seconds sinceDate: UTCDate];  9      10 } 11  12 //將當地時區的標準Date轉化為UTCDate 13 //當前當地的標準時間：2018-03-27 14:54:41 +0000 14 //轉化為世界標準時間:2018-03-27 06:54:41 +0000 15 -(NSDate *)getUTCDateFromLocalDate:(NSDate *)LocalDate{ 16      17     NSTimeZone *tz = [NSTimeZone defaultTimeZone]; 18     NSInteger seconds = -[tz secondsFromGMTForDate: LocalDate]; 19     return [NSDate dateWithTimeInterval: seconds sinceDate: LocalDate]; 20      21 } 22  23 //根據UTCDate擷取目前時間字串（鐘錶上顯示的時間） 24 //輸入：[NSDate date]     2018-03-27 07:44:05 +0000 25 //輸出：2018-03-27 15:44:05 26 -(NSString *)localStringFromUTCDate:(NSDate *)UTCDate{ 27      28     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init]; 29     NSTimeZone *tz = [NSTimeZone defaultTimeZone]; 30     [dateFormatter setTimeZone:tz]; 31     [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 32     NSString* result=[dateFormatter stringFromDate:UTCDate]; 33     return result; 34      35 } 36  37 //根據UTC字串擷取目前時間字串（鐘錶上顯示的時間） 38 //輸入：2018-03-27 07:44:05 39 //輸出：2018-03-27 15:44:05 40 -(NSString *)localStringFromUTCString:(NSString *)UTCString{ 41      42     //先將UTC字串轉為UTCDate; 43     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 44     NSTimeZone *tz = [NSTimeZone timeZoneWithAbbreviation:@"GMT"]; 45     [dateFormatter setTimeZone:tz]; 46     [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 47     NSDate *UTCDate = [dateFormatter dateFromString:UTCString]; 48      49     [dateFormatter setTimeZone:[NSTimeZone defaultTimeZone]]; 50     NSString* result = [dateFormatter stringFromDate:UTCDate]; 51     return result; 52 } 53  54 //將目前時間字串轉為UTCDate 55 -(NSDate *)UTCDateFromLocalString:(NSString *)localString{ 56      57     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 58     [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 59     NSDate *date = [dateFormatter dateFromString:localString]; 60     return date; 61 } 62  63 //將目前時間字串轉為UTC字串 64 -(NSString *)UTCStringFromLocalString:(NSString *)localString{ 65      66     NSDate *date = [self UTCDateFromLocalString:localString]; 67     NSString *string = [NSString stringWithFormat:@"%@",date]; 68     NSString *result = [string substringToIndex:string.length-6]; 69     return result; 70      71 } 72  73 //UTCDate轉UTC字串 74 -(NSString *)UTCStringFromUTCDate:(NSDate *)UTCDate{ 75      76     NSDateFormatter *dataFormatter = [[NSDateFormatter alloc]init]; 77     [dataFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 78     NSTimeZone *tz = [NSTimeZone timeZoneWithAbbreviation:@"GMT"]; 79     [dataFormatter setTimeZone:tz]; 80     NSString *UTCString = [dataFormatter stringFromDate:UTCDate]; 81     return UTCString; 82      83 } 84  85 //將目前時間（UTCDate）轉為時間戳記 86 -(NSString *)timeStampFromUTCDate:(NSDate *)UTCDate{ 87      88     NSTimeInterval timeInterval = [UTCDate timeIntervalSince1970]; 89     // *1000,是精確到毫秒；這裡是精確到秒; 90     NSString *result = [NSString stringWithFormat:@"%.0f",timeInterval]; 91     return result; 92      93 } 94  95 //目前時間字串(鐘錶上顯示的時間)轉為時間戳記 96 -(NSString *)timeStamapFromLocalString:(NSString *)localString{ 97      98     //先轉為UTCDate 99     NSDate *UTCDate = [self UTCDateFromLocalString:localString];100     NSString *timeStamap = [self timeStampFromUTCDate:UTCDate];101     return timeStamap;102     103 }104 105 //將UTCString轉為時間戳記106 -(NSString *)timeStamapFromUTCString:(NSString *)UTCString{107     108     //先將UTC字串轉為UTCDate;109     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];110     NSTimeZone *tz = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];111     [dateFormatter setTimeZone:tz];112     [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];113     NSDate *UTCDate = [dateFormatter dateFromString:UTCString];114     115     NSString *timeStamap = [self timeStampFromUTCDate:UTCDate];116     return timeStamap;117 }118 119 //時間戳記轉UTCDate120 -(NSDate *)UTCDateFromTimeStamap:(NSString *)timeStamap{121     122     NSTimeInterval timeInterval=[timeStamap doubleValue];123     //  /1000;傳入的時間戳記timeStamap如果是精確到毫秒的記得要/1000124     NSDate *UTCDate=[NSDate dateWithTimeIntervalSince1970:timeInterval];125     return UTCDate;126     127 }

若是想要將時間戳記轉為字串，可根據獲得的UTCDate再進行轉化