ios时间处理

1.获取时间的年,月,日,时,分,秒
 1  //"expireDatetime": "2015-07-28 17:29:48.0"   <==>   转换
 2     NSString *dateStr = [model.expireDatetime substringToIndex:model.expireDatetime.length-cutLength];
 3     //装换成日期
 4     NSDateFormatter *df = [[NSDateFormatter alloc]init];
 5     [df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
 6     NSDate *date = [df dateFromString:dateStr];
 7     //计算时间差
 8     //参数1:时间差里包含的内容(年,月,日,时,分,秒)
 9     //参数2:起始时间
10     //参数3:结束时间
11     //参数4:比较的一些附加参数
12     NSCalendar *calendar = [NSCalendar currentCalendar];
13     unsigned int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
14     NSDateComponents *dc = [calendar components:unit fromDate:[NSDate date] toDate:date options:0];
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