Object C 擷取日期（學習筆記一）

 

參考iOS，發現操作日期的對象是NSDate，使用方法大致如下：

 

//得到當前的日期<br /> NSDate *date = [NSDate date];<br /> NSLog(@"date:%@",date);</p><p> //得到(24 * 60 * 60)即24小時之前的日期，dateWithTimeIntervalSinceNow:<br /> NSDate *yesterday = [NSDate dateWithTimeIntervalSinceNow: -(24 * 60 * 60)];<br /> NSLog(@"yesterday:%@",yesterday);<br />NSDateFormatter *formatter =[[[NSDateFormatter alloc] init] autorelease];<br /> NSDate *date = [NSDate date];<br /> [formatter setTimeStyle:NSDateFormatterMediumStyle];<br /> NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];<br /> NSDateComponents *comps = [[[NSDateComponents alloc] init] autorelease];<br /> NSInteger unitFlags = NSYearCalendarUnit |<br /> NSMonthCalendarUnit |<br /> NSDayCalendarUnit |<br /> NSWeekdayCalendarUnit |<br /> NSHourCalendarUnit |<br /> NSMinuteCalendarUnit |<br /> NSSecondCalendarUnit;<br /> //int week=0;<br /> comps = [calendar components:unitFlags fromDate:date];<br /> int week = [comps weekday];<br /> int year=[comps year];<br /> int month = [comps month];<br /> int day = [comps day];<br /> //[formatter setDateStyle:NSDateFormatterMediumStyle];<br /> //This sets the label with the updated time.<br /> int hour = [comps hour];<br /> int min = [comps minute];<br /> int sec = [comps second];<br /> NSLog(@"week%d",week);<br /> NSLog(@"year%d",year);<br /> NSLog(@"month%d",month);<br /> NSLog(@"day%d",day);<br /> NSLog(@"hour%d",hour);<br /> NSLog(@"min%d",min);<br /> NSLog(@"sec%d",sec);<br />//得到毫秒<br />NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];<br /> [dateFormatter setDateStyle:NSDateFormatterMediumStyle];<br /> [dateFormatter setTimeStyle:NSDateFormatterShortStyle];<br /> //[dateFormatter setDateFormat:@"hh:mm:ss"]<br /> [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];<br /> NSLog(@"Date%@", [dateFormatter stringFromDate:[NSDate date]]);<br /> [dateFormatter release];