iOS開發NSDate、NSString、時間戳之間的轉化

  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獲取當前時間字元串（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字元串獲取當前時間字元串（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字元串轉為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 //將當前時間字元串轉為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 //將當前時間字元串轉為UTC字元串
 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字元串
 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 //將當前時間（UTCDate）轉為時間戳
 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 //當前時間字元串(鐘錶上顯示的時間)轉為時間戳
 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
106 -(NSString *)timeStamapFromUTCString:(NSString *)UTCString{
107     
108     //先將UTC字元串轉為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 //時間戳轉UTCDate
120 -(NSDate *)UTCDateFromTimeStamap:(NSString *)timeStamap{
121     
122     NSTimeInterval timeInterval=[timeStamap doubleValue];
123     //  /1000;傳入的時間戳timeStamap如果是精確到毫秒的記得要/1000
124     NSDate *UTCDate=[NSDate dateWithTimeIntervalSince1970:timeInterval];
125     return UTCDate;
126     
127 }

若是想要將時間戳轉為字元串，可根據獲得的UTCDate再進行轉化