ios 获取本地时间

1. //获得系统时间

2. NSDate * senddate=[NSDate date];

3. NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];

4. [dateformatter setDateFormat:@"HH:mm"];

5. NSString * locationString=[dateformatter stringFromDate:senddate];

6. //[dateformatter setDateFormat:@"YYYY-MM-dd-HH-mm-ss"];

7. //NSString * morelocationString=[dateformatter stringFromDate:senddate];

8. 
   

9. //获得系统日期

10. NSCalendar * cal=[NSCalendar currentCalendar];

11. NSUInteger unitFlags=NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit;

12. NSDateComponents * conponent= [cal components:unitFlags fromDate:senddate];

13. NSInteger year=[conponent year];

14. NSInteger month=[conponent month];

15. NSInteger day=[conponent day];

16. NSString * nsDateString= [NSString stringWithFormat:@"M年-月-日",year,month,day];

17. 
    

18. [dateformatter release];

2. 从字符串来获得NSDate

1. string strYear="1988";

2. string strMonth="09";

3. string strDay="18";

4. string strHour="5";

5. string strMinutes="18";

6. string strSec="20";

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9. 
   

10. morelocationString=[NSString stringWithFormat:@"%s-%s-%s-%s-%s-%s",strYear.c_str(),strMonth.c_str(),

11. strDay.c_str(),strHour.c_str(),strMinutes.c_str(),strSec.c_str()];

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13. 
    

14. //根据时间字符串获得NSDate

15. NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];

16. [dateformatter setDateFormat:@"YYYY-MM-dd-HH-mm-ss"];

17. NSDate * oldDate=[dateformatter dateFromString:morelocationString];

3. 从GMT时间，得到本地时间

1. NSDate * oldDate=[dateformatter dateFromString:morelocationString];

2. 
   

3. 
   

4. NSTimeInterval timeZoneOffset=[[NSTimeZone systemTimeZone] secondsFromGMT];

5. NSDate * newDate=[oldDate dateByAddingTimeInterval:timeZoneOffset];