如何获得系统时间和日期-ios培训

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如何获得系统时间和日期-ios培训

作者:未知更新时间:2013-05-10 13:15:00 来源:达内 iphone培训网址：www.changshadanei.com

ios培训之ios如何获得系统时间和日期
01. //获得系统时间
02. NSDate * senddate=[NSDate date];
03. NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
04. [dateformatter setDateFormat:@"HH:mm"];
05. NSString * locationString=[dateformatter stringFromDate:senddate];
06. //[dateformatter setDateFormat:@"YYYY-MM-dd-HH-mm-ss"];
07. //NSString * morelocationString=[dateformatter stringFromDate:senddate];
08.
09. //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:@"%4d年%2d月%2d日",year,month,day];
17.
18. [dateformatter release];

2. 从字符串来获得NSDate
01. string strYear="1988";
02. string strMonth="09";
03. string strDay="18";
04. string strHour="5";
05. string strMinutes="18";
06. string strSec="20";
07.
08.
09.
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()];
12.
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
01. NSDate * oldDate=[dateformatter dateFromString:morelocationString];
02.
03.
04.            NSTimeInterval timeZoneOffset=[[NSTimeZone systemTimeZone] secondsFromGMT];
05.            NSDate * newDate=[oldDate dateByAddingTimeInterval:timeZoneOffset];

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