//

//  NSDate+Joe.h

//  WeiBo

//

//  Created by 张秀清 on 15/9/17.

//  Copyright (c) 2015年 张秀清. All rights reserved.

//

#import <Foundation/Foundation.h>

@interface NSDate (Joe)

/**

 *  是否是今天

 */

-(BOOL)isToday;

/**

 *  是否是这个月

 */

-(BOOL)isThisYear;

/**

 *  是否是今年

 */

-(BOOL)isThisMonth;

/**

 *  是否为昨天

 */

- (BOOL)isYesterday;

/**

 *  返回'YYYY-MM-DD'的nsdate

 */

- (NSDate *)dateWithYMD;

/**

 *  返回与当前时间的差距

 */

- (NSDateComponents *)deltaWithNow;

@end

//

//  NSDate+Joe.m

//  WeiBo

//

//  Created by 张秀清 on 15/9/17.

//  Copyright (c) 2015年 张秀清. All rights reserved.

//

#import "NSDate+Joe.h"

@implementation NSDate (Joe)

-(BOOL)isToday

{

    NSCalendar *calendar = [NSCalendar currentCalendar];

    int NSCalendarUnit = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;

    //获取当前的年月日

    NSDateComponents *nowCps = [calendar components:NSCalendarUnit fromDate:[NSDate date]];

    NSDateComponents *selfCps = [calendar components:NSCalendarUnit fromDate:self];

    return (nowCps.year == selfCps.year) && (nowCps.month == selfCps.month) && (nowCps.day == selfCps.day);

}

-(BOOL)isThisMonth

{

    NSCalendar *calendar = [NSCalendar currentCalendar];

    int NSCalendarUnit = NSCalendarUnitYear | NSCalendarUnitMonth;

    //获取当前的年月日

    NSDateComponents *nowCps = [calendar components:NSCalendarUnit fromDate:[NSDate date]];

    NSDateComponents *selfCps = [calendar components:NSCalendarUnit fromDate:self];

    return (nowCps.year == selfCps.year) && (nowCps.month == selfCps.month);

}

-(BOOL)isThisYear

{

    NSCalendar *calendar = [NSCalendar currentCalendar];

    int NSCalendarUnit = NSCalendarUnitYear;

    //获取当前的年月日

    NSDateComponents *nowCps = [calendar components:NSCalendarUnit fromDate:[NSDate date]];

    NSDateComponents *selfCps = [calendar components:NSCalendarUnit fromDate:self];

    return nowCps.year == selfCps.year;

}

/**

 *  是否为昨天

 */

- (BOOL)isYesterday

{

    // 2014-05-01

    NSDate *nowDate = [[NSDate date] dateWithYMD];

    // 2014-04-30

    NSDate *selfDate = [self dateWithYMD];

    // 获得nowDate和selfDate的差距

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *cmps = [calendar components:NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:0];

    return cmps.day == 1;

}

/**

 *  返回'YYYY-MM-DD'的nsdate

 */

- (NSDate *)dateWithYMD

{

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

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

    NSString *selfStr = [fmt stringFromDate:self];

    return [fmt dateFromString:selfStr];

}

/**

 *  返回与当前时间的差距

 */

- (NSDateComponents *)deltaWithNow

{

    NSCalendar *calendar = [NSCalendar currentCalendar];

    int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;

    return [calendar components:unit fromDate:self toDate:[NSDate date] options:0];

}

@end