NSDate增加分类 计算某年某月某日

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#import <Foundation/Foundation.h>

@interface NSDate (Addition)

/**

 *某一天在当月多少号

 */

- (NSInteger)daysOfCurrentMonth;

/**

 *  某月第一天周几

 *

 */

- (NSInteger)weekOfFirstDayInCurrentMonth;

- (NSInteger)day;

- (NSInteger)month;

- (NSInteger)year;

- (NSString *)dateStrWithFormat:(NSString *)format;

- (NSTimeInterval)zeroTimestamp;

@end

#import "NSDate+Addition.h"

@implementation NSDate (Addition)

- (NSInteger)daysOfCurrentMonth

{

    NSInteger days = 0;

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

    days = [calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:self].length;

    return days;

}

- (NSInteger)weekOfFirstDayInCurrentMonth

{

    NSInteger week = 0;

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

    week = [calendar ordinalityOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitWeekOfMonth forDate:self] - 1;

    return week;

}

- (NSInteger)day

{

    NSInteger day = 1;

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

    day = [calendar ordinalityOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:self];

    return day;

}

- (NSInteger)month

{

    NSInteger month = 1;

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

    month = [calendar ordinalityOfUnit:NSCalendarUnitMonth inUnit:NSCalendarUnitYear forDate:self];

    return month;

}

- (NSInteger)year

{

    NSInteger year = 2015;

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

    year = [calendar ordinalityOfUnit:NSCalendarUnitYear inUnit:NSCalendarUnitEra forDate:self];

    return year;

}

- (NSString *)dateStrWithFormat:(NSString *)format

{

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    formatter.dateFormat = format;

    return [formatter stringFromDate:self];

}

- (NSTimeInterval)zeroTimestamp

{

    NSTimeInterval timeInterval = 0;

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    formatter.dateFormat = @"yyyy-MM-dd";

    NSString *zeroTimeStr = [formatter stringFromDate:self];

    NSDate *zeroDate = [formatter dateFromString:zeroTimeStr];

    timeInterval = [zeroDate timeIntervalSince1970];

    return timeInterval;

}

 在制作日历是时间的分类尤其重要.

NSDate增加分类 计算某年某月某日

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原文地址：http://www.cnblogs.com/LVanswer/p/5687146.html