iOS-判断是否同一天

判断两个日期是否同一天

    NSCalendar *calendar = [NSCalendar currentCalendar];
    unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay;
    // 要比较的那个日期，NSDate类型
    NSDateComponents* comp1 = [calendar components:unitFlags fromDate:createOrderTime];
    // 跟现在的时间相比
    NSDateComponents* comp2 = [calendar components:unitFlags fromDate:now];
    BOOL isSameDay = [comp1 day] == [comp2 day] && [comp1 month] == [comp2 month] && [comp1 year]  == [comp2 year];