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NSDate/NSData中常用的方法
NSString
*str =
@"1234abcd"
;
NSData *data = [str dataUsingEncoding : NSUTF8StringEncoding ]; // 将字符转换成 dataNSUTF8StringEncoding 为编码格式
NSString *str1 = [[ NSString alloc ] initWithData :data encoding : NSUTF8StringEncoding ]; // 将 data 转换成字符
NSLog ( @"%@" ,str1);
NSLog ( @"%@" ,data);
NSLog ( @"%zi" ,data. length ); //data 的长度
NSData *data1 = [ NSData dataWithContentsOfURL :[ NSURL URLWithString : @"http://image.baidu.com" ]]; // 获取网络数据
//NSLog(@"%@",data1);
NSData *data = [str dataUsingEncoding : NSUTF8StringEncoding ]; // 将字符转换成 dataNSUTF8StringEncoding 为编码格式
NSString *str1 = [[ NSString alloc ] initWithData :data encoding : NSUTF8StringEncoding ]; // 将 data 转换成字符
NSLog ( @"%@" ,str1);
NSLog ( @"%@" ,data);
NSLog ( @"%zi" ,data. length ); //data 的长度
NSData *data1 = [ NSData dataWithContentsOfURL :[ NSURL URLWithString : @"http://image.baidu.com" ]]; // 获取网络数据
//NSLog(@"%@",data1);
NSMutableData
*data2 = [
NSMutableData
data
];
//
创建一个空的数据
[data2 appendData:data];
//1. 获取当前时间
NSDate *date1 = [ NSDate date ];
NSLog ( @"1. %@" ,date1);
//2. 以当前时间为基准 n 秒后的时间
NSDate *date2 = [ NSDate dateWithTimeIntervalSinceNow :60];
NSLog ( @"2. %@" ,date2);
//3. 以 1970 年为基准 n 秒后的时间
NSDate *date3 = [ NSDate dateWithTimeIntervalSince1970 :24*60*60];
NSLog ( @"3. %@" ,date3);
//4. 在某一时间上加过 n 秒后的时间
NSDate *afterTime = [date1 dateByAddingTimeInterval :60];
NSLog ( @"4. %@" ,afterTime);
//5. 获取当前时间距离 1970 年的秒数
NSTimeInterval time = [[ NSDate date ] timeIntervalSince1970 ];
NSLog ( @"5. %lf" ,time);
NSTimeInterval time1 = [[ NSDate dateWithTimeIntervalSinceNow :60] timeIntervalSince1970 ];
NSLog ( @"5. %lf" ,time1);
//6. 返回给定时间与当前时间的时间差单位秒
NSTimeInterval time2 = [date1 timeIntervalSinceNow ];
NSLog ( @"6. %lf" ,time2);
NSTimeInterval time3 = [date2 timeIntervalSinceNow ];
NSLog ( @"6. %lf" ,time3);
//7. 获取两日期之间的时间差
NSTimeInterval time4 = [date2 timeIntervalSinceDate :date1];
NSLog ( @"7. %lf" ,time4);
//8. 获取两个日期中距 1970 最远 ( 最近 ) 的日期
NSDate *laterOne = [date1 laterDate :date2];
NSLog ( @"8. %@" ,laterOne);
NSDate *earlyOne= [date1 earlierDate :date2];
NSLog ( @"8. %@" ,earlyOne);
//9.
日期时间格式化对象
NSDateFormatter
*foma = [[
NSDateFormatter
alloc
]
init
];
[foma setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDateFormatter
*dateFormatter = [
NSDateFormatter
new
];
[dateFormatter setDateFormat : @"yyyy 年 MM 月 dd 日 HH:mm:ss" ];
NSLog ( @"9. %@" ,[dateFormatter stringFromDate :date1]);
//10. 把日期格式的字符串转换成日期对象
NSString *myDateTimeStr = @"2015.11.3 12:12:12" ;
NSDateFormatter *formatter = [ NSDateFormatter new ];
[formatter setDateFormat : @"yyyy-MM-dd HH:mm:ss" ];
NSDate *newDate = [formatter dateFromString :myDateTimeStr];
NSLog ( @"10. %@" ,[formatter stringFromDate :newDate]);
//11. 系统时区
NSTimeZone *zone = [ NSTimeZone systemTimeZone ];
NSLog ( @"11. %@" ,zone);
//12. 系统时区缩写
NSString *str = [zone abbreviation ];
NSLog ( @"12. %@" ,str);
//13. 当地时区
NSTimeZone *localTimeZone = [ NSTimeZone localTimeZone ];
NSLog ( @"13. %@" ,localTimeZone);
//14. 和格林尼治时间差
NSInteger timeOff = [zone secondsFromGMT ];
NSLog ( @"14. %ld" ,( long )timeOff);
//15. 时差转换
NSDate *timeOffDate = [date1 dateByAddingTimeInterval :[[ NSTimeZone systemTimeZone ] secondsFromGMT ]];
[dateFormatter setDateFormat : @"yyyy 年 MM 月 dd 日 HH:mm:ss" ];
NSLog ( @"9. %@" ,[dateFormatter stringFromDate :date1]);
//10. 把日期格式的字符串转换成日期对象
NSString *myDateTimeStr = @"2015.11.3 12:12:12" ;
NSDateFormatter *formatter = [ NSDateFormatter new ];
[formatter setDateFormat : @"yyyy-MM-dd HH:mm:ss" ];
NSDate *newDate = [formatter dateFromString :myDateTimeStr];
NSLog ( @"10. %@" ,[formatter stringFromDate :newDate]);
//11. 系统时区
NSTimeZone *zone = [ NSTimeZone systemTimeZone ];
NSLog ( @"11. %@" ,zone);
//12. 系统时区缩写
NSString *str = [zone abbreviation ];
NSLog ( @"12. %@" ,str);
//13. 当地时区
NSTimeZone *localTimeZone = [ NSTimeZone localTimeZone ];
NSLog ( @"13. %@" ,localTimeZone);
//14. 和格林尼治时间差
NSInteger timeOff = [zone secondsFromGMT ];
NSLog ( @"14. %ld" ,( long )timeOff);
//15. 时差转换
NSDate *timeOffDate = [date1 dateByAddingTimeInterval :[[ NSTimeZone systemTimeZone ] secondsFromGMT ]];
NSLog(@"15. %@",timeOffDate);
//时差转换
//1.
NSString *str1 = @"2015-11-11 11:11:11" ;
NSDate *date1 = [ NSDate date ];
NSDateFormatter *formatter = [[ NSDateFormatter alloc ] init ];
[formatter setDateFormat : @"yyyy/MM/dd HH:mm:ss" ];
NSDate *newDate = [formatter dateFromString :str1];
NSLog ( @"%@" ,[formatter stringFromDate :newDate]);
NSLog ( @"%@" ,newDate);
//2.
NSDate *d = [date1 dateByAddingTimeInterval :[[ NSTimeZone systemTimeZone ] secondsFromGMT ]];
NSLog ( @"%@" ,d);
//3.
NSDateFormatter *fm = [[ NSDateFormatter alloc ] init ];
[fm setTimeZone :[ NSTimeZone timeZoneForSecondsFromGMT :0]];
NSString *str1 = @"2015-11-11 11:11:11" ;
NSDate *date1 = [ NSDate date ];
NSDateFormatter *formatter = [[ NSDateFormatter alloc ] init ];
[formatter setDateFormat : @"yyyy/MM/dd HH:mm:ss" ];
NSDate *newDate = [formatter dateFromString :str1];
NSLog ( @"%@" ,[formatter stringFromDate :newDate]);
NSLog ( @"%@" ,newDate);
//2.
NSDate *d = [date1 dateByAddingTimeInterval :[[ NSTimeZone systemTimeZone ] secondsFromGMT ]];
NSLog ( @"%@" ,d);
//3.
NSDateFormatter *fm = [[ NSDateFormatter alloc ] init ];
[fm setTimeZone :[ NSTimeZone timeZoneForSecondsFromGMT :0]];
NSLog
(
@"%@"
,[fm
stringFromDate
:[
NSDate
date
]]);