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iOS 判断两个日期是不是同一天

/** *  是否为同一天 */- (BOOL)isSameDay:(NSDate*)date1 date2:(NSDate*)date2{    NSCalendar* calendar = [NSCalendar currentCalendar];        unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit;    NSDateComponents* comp1 = [calendar components:unitFlags fromDate:date1];    NSDateComponents* comp2 = [calendar components:unitFlags fromDate:date2];        return [comp1 day]   == [comp2 day] &&    [comp1 month] == [comp2 month] &&    [comp1 year]  == [comp2 year];}

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