轉載自:??http://blog.csdn.net/w250130255/article/details/48000895

1、可以實現時間篩選，目測應該還有更簡單的方法。

思路： 獲取當天時間，和目標時間進行比對操作。

注意點：時區 時區 時區 重要的時區說三遍。

[objc]? view plain ?copy

-?(void)viewDidLoad?{??

????[super?viewDidLoad];??

????NSDate?*?today?=?[NSDate?date];??

??????

????//定義當前時區時間??

????NSString?*?time?=@"2015-08-16?00:00:00";??

????NSDate*?xmlData?=?[self?dateFromString:time];??

??????

????xmlData?=?[self?getNowDateFromatAnDate:xmlData];??

??????

????if([self?intervalSinceNow:xmlData]>=[self?getTodayisWeek:today]+7)??

????{??

????????NSLog(@"這個日期是很早以前");??

????}??

????if([self?intervalSinceNow:xmlData]>=[self?getTodayisWeek:today]&&[self?intervalSinceNow:xmlData]<[self?getTodayisWeek:today]+7)??

????{??

????????NSLog(@"這個日期是上周");??

????}??

????if([self?intervalSinceNow:xmlData]<7&&[self?intervalSinceNow:xmlData]<[self?getTodayisWeek:today])??

????{??

????????NSLog(@"這個日期是本周");??

????}??

??????

??????

}??

??

-?(int)intervalSinceNow:?(NSDate?*)?theDate??

{??

????NSTimeInterval?late=[theDate?timeIntervalSince1970]*1;??

??????

????NSDate*?dat?=?[NSDate?dateWithTimeIntervalSinceNow:0];??

????dat=??[self?getNowDateFromatAnDate:dat];??

????NSTimeInterval?now=[dat?timeIntervalSince1970]*1;??

????NSString?*timeString=@"";??

??????

????NSTimeInterval?cha=now-late;??

??????

????if?(cha/86400>1)??

????{??

????????timeString?=?[NSString?stringWithFormat:@"%f",?cha/86400];??

????????timeString?=?[timeString?substringToIndex:timeString.length-7];??

????????return?[timeString?intValue];??

????}??

????return?-1;??

?????

}??

??

-?(NSDate?*)getNowDateFromatAnDate:(NSDate?*)anyDate??

{??

????//設置源日期時區??

????NSTimeZone*?sourceTimeZone?=?[NSTimeZone?timeZoneWithAbbreviation:@"UTC"];//或GMT??

????//設置轉換后的目標日期時區??

????NSTimeZone*?destinationTimeZone?=?[NSTimeZone?localTimeZone];??

????//得到源日期與世界標準時間的偏移量??

????NSInteger?sourceGMTOffset?=?[sourceTimeZone?secondsFromGMTForDate:anyDate];??

????//目標日期與本地時區的偏移量??

????NSInteger?destinationGMTOffset?=?[destinationTimeZone?secondsFromGMTForDate:anyDate];??

????//得到時間偏移量的差值??

????NSTimeInterval?interval?=?destinationGMTOffset?-?sourceGMTOffset;??

????//轉為現在時間??

????NSDate*?destinationDateNow?=?[[NSDate?alloc]?initWithTimeInterval:interval?sinceDate:anyDate];??

????return?destinationDateNow;??

}??

-?(NSDate?*)dateFromString:(NSString?*)dateString{??

??????

????NSDateFormatter?*dateFormatter?=?[[NSDateFormatter?alloc]?init];??

??????

????[dateFormatter?setDateFormat:?@"yyyy-MM-dd?HH:mm:ss"];??

??????

?????NSDate?*destDate=?[dateFormatter?dateFromString:dateString];??

??????

?????return?destDate;??

??????

}??

??

//獲得某日是周幾??

-(int)getTodayisWeek:(NSDate?*)today??

{??

????today?=?[self?getNowDateFromatAnDate:today];??

????NSCalendar*calendar?=?[NSCalendar?currentCalendar];??

????NSDateComponents*comps;??

????[comps?setWeekday:0];??

????comps?=[calendar?components:(NSCalendarUnitWeekday)fromDate:today];??

????NSInteger?weekday?=?[comps?weekday];?//?星期幾（注意，周日是“1”，周一是“2”。。。。）??

????int??factWeekDay;??

????//默認是周日開始??

????switch?(weekday)?{??

????????case?1:??

????????????factWeekDay?=?7??;??

????????????break;??

????????case?2:??

????????????factWeekDay?=?1??;??

????????????break;??

????????case?3:??

????????????factWeekDay?=?2??;??

????????????break;??

????????case?4:??

????????????factWeekDay?=?3??;??

????????????break;??

????????case?5:??

????????????factWeekDay?=?4??;??

????????????break;??

????????case?6:??

????????????factWeekDay?=?5??;??

????????????break;??

????????case?7:??

????????????factWeekDay?=?6??;??

????????????break;??

????????default:??

????????????break;??

????}??

??????

????return??factWeekDay;??

}??

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