制作日历的方法总结

如何计算某一年某个月有多少天

-(int)howManyDaysInThisMonth:(int)year month:(int)imonth {

   
    if((imonth == 1)||(imonth == 3)||(imonth == 5)||(imonth == 7)||(imonth == 8)||(imonth == 10)||(imonth == 12))
        return 31;
    if((imonth == 4)||(imonth == 6)||(imonth == 9)||(imonth == 11))
        return 30;
    if((year%4 == 1)||(year%4 == 2)||(year%4 == 3))
    {
        return 28;
    }
    if(year%400 == 0)
        return 29;
    if(year%100 == 0)
        return 28;
    return 29;

};

///string转换为NSData

NSDateFormatter *formate = [[NSDateFormatter alloc] init];
    formate.dateFormat = @"yyyy-MM-dd HH";
    NSData *str = [formate dateFromString:@"2015-07-29 22"];

    NSLog(@"%@",str);

给你一个方法，输入参数是NSDate，输出结果是星期几的字符串。

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

NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"Sunday", @"周一", @"周二", @"周三", @"周四", @"周五", @"周六", nil];

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

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

[calendar setTimeZone: timeZone];

NSCalendarUnit calendarUnit = NSWeekdayCalendarUnit;

NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:inputDate];

return [weekdays objectAtIndex:theComponents.weekday];

}

01    //获取当前时间

02    NSDate *now = [NSDate date];

03    NSLog(@”now date is: %@”, now);

04

05    NSCalendar *calendar = [NSCalendar currentCalendar];

06    NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

07    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];

08     

09    int year = [dateComponent year];

10    int month = [dateComponent month];

11    int day = [dateComponent day];

12    int hour = [dateComponent hour];

13    int minute = [dateComponent minute];

14    int second = [dateComponent second];

15

16    NSLog(@”year is: %d”, year);

17    NSLog(@”month is: %d”, month);

18    NSLog(@”day is: %d”, day);

19    NSLog(@”hour is: %d”, hour);

20    NSLog(@”minute is: %d”, minute);

21    NSLog(@”second is: %d”, second);