根据日期判断周几

- (NSString*)weekdayStringFromDate:(NSDate*)inputDate {

NSArray*weekdays = [NSArrayarrayWithObjects: [NSNullnull],@"周日",@"周一",@"周二",@"周三",@"周四",@"周五",@"周六",nil];

NSCalendar*calendar = [[NSCalendaralloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

NSTimeZone*timeZone = [[NSTimeZonealloc]initWithName:@"Asia/Shanghai"];

[calendarsetTimeZone: timeZone];

NSCalendarUnitcalendarUnit =NSCalendarUnitWeekday;

NSDateComponents*theComponents = [calendarcomponents:calendarUnitfromDate:inputDate];

return[weekdaysobjectAtIndex:theComponents.weekday];

}

调用：

NSDate*date = [NSDate date];

NSString *str= [self weekdayStringFromDate:date];