iOS开发NSDate、NSString、时间戳之间的转化

  1 //将UTCDate(世界标准时间)转化为当地时区的标准Date（钟表显示的时间）
  2 //NSDate *date = [NSDate date];   2018-03-27 06:54:41 +0000
  3 //转化后：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 //将当地时区的标准Date转化为UTCDate
 13 //当前当地的标准时间：2018-03-27 14:54:41 +0000
 14 //转化为世界标准时间: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 //根据UTCDate获取当前时间字符串（钟表上显示的时间）
 24 //输入：[NSDate date]     2018-03-27 07:44:05 +0000
 25 //输出：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 //根据UTC字符串获取当前时间字符串（钟表上显示的时间）
 38 //输入：2018-03-27 07:44:05
 39 //输出：2018-03-27 15:44:05
 40 -(NSString *)localStringFromUTCString:(NSString *)UTCString{
 41     
 42     //先将UTC字符串转为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 //将当前时间字符串转为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 //将当前时间字符串转为UTC字符串
 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转UTC字符串
 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 //将当前时间（UTCDate）转为时间戳
 86 -(NSString *)timeStampFromUTCDate:(NSDate *)UTCDate{
 87     
 88     NSTimeInterval timeInterval = [UTCDate timeIntervalSince1970];
 89     // *1000,是精确到毫秒；这里是精确到秒;
 90     NSString *result = [NSString stringWithFormat:@"%.0f",timeInterval];
 91     return result;
 92     
 93 }
 94 
 95 //当前时间字符串(钟表上显示的时间)转为时间戳
 96 -(NSString *)timeStamapFromLocalString:(NSString *)localString{
 97     
 98     //先转为UTCDate
 99     NSDate *UTCDate = [self UTCDateFromLocalString:localString];
100     NSString *timeStamap = [self timeStampFromUTCDate:UTCDate];
101     return timeStamap;
102     
103 }
104 
105 //将UTCString转为时间戳
106 -(NSString *)timeStamapFromUTCString:(NSString *)UTCString{
107     
108     //先将UTC字符串转为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 //时间戳转UTCDate
120 -(NSDate *)UTCDateFromTimeStamap:(NSString *)timeStamap{
121     
122     NSTimeInterval timeInterval=[timeStamap doubleValue];
123     //  /1000;传入的时间戳timeStamap如果是精确到毫秒的记得要/1000
124     NSDate *UTCDate=[NSDate dateWithTimeIntervalSince1970:timeInterval];
125     return UTCDate;
126     
127 }

若是想要将时间戳转为字符串，可根据获得的UTCDate再进行转化