日期类

来源：互联网发布：程序员出身的名人编辑：程序博客网时间：2024/05/16 16:20

.h文件

/*** *  bate:1.1.1 *  use:Date class *  aythor: haohdq * ***/#pragma once#ifndef _LIBCPP_IOSTREAM#include <iostream>#endif#ifndef _LIBCPP_STRING#include <string>#endif#ifndef _TIME_H_#include <time.h>#endif#ifndef _DATE_H_#define _DATE_H_class Date{public:Date(int y,int m,int d):y(y),m(m),d(d){set(y,m,d);}        explicit Date(const int yyy=19900101){            int yy=yyy;            y=yy/10000;            yy%=10000;            m=yy/100;            d=yy%100;        }        Date(const std::string h){            int tmp=0;            for(int i=0;i<h.length();i++){                while(h[i]>='0'&&h[i]<='9'&&i<h.length()){                    tmp+=h[i]-'0';                    tmp*=10;                    i++;                }            }            tmp/=10;            int yy=tmp;            int y1=yy/10000;yy%=10000;            int m1=yy/100;            int d1=yy%100;            set(y1,m1,d1);        }        int y_day()const{            Date a=*this;            a.set_m(1);            a.set_d(1);            return *this-a+1;        }        int ny_day()const{            return 365+is_p_year()-y_day();        }int get_year()const{return y;}int get_month()const{return m;}int get_day()const{return d;}        int week_num()const{//求星期几            int yy=y,mm=m;            if(mm==1||mm==2)mm+=12;            int c=yy/100;            yy%=100;            return (yy+yy/4+c/4-2*c+26*(mm+1)/10+d-1)%7;        }bool is_p_year()const{return y%400?(y%100?(y%4?0:1):0):1;}bool is_p_year(const int yy)const{return yy%400?(yy%100?(yy%4?0:1):0):1;}void set(int yy,int mm,int dd){if(yy<=0)yy=1990;else y=yy;if(mm<=0||mm>12)m=1;else m=mm;if(dd<=0||dd>DayforMonth(y,m))d=1;else d=dd;}void set_y(int yy){set(yy,m,d);}void set_m(int mm){set(y,mm,d);}void set_d(int dd){set(y,m,dd);}        void set_now(){            time_t curtime=time(0);            tm tim =*localtime(&curtime);            set(tim.tm_year+1900,tim.tm_mon+1,tim.tm_mday);        }Date& operator += (const int c);        Date& operator -= (const int c);friend Date operator + (const int v,const Date a);friend Date operator + (const Date a,const int v);        Date operator ++(int);        Date& operator ++();friend Date operator - (const Date a,const int v);friend int  operator - (const Date a,const Date b);        Date operator --(int);        Date& operator --();friend bool operator > (const Date a,const Date b);friend bool operator >=(const Date a,const Date b);friend bool operator < (const Date a,const Date b);friend bool operator <=(const Date a,const Date b);friend bool operator ==(const Date a,const Date b);        friend bool operator !=(const Date a,const Date b);        friend std::ostream & operator <<(std::ostream &os,const Date &a);friend std::istream & operator >>(std::istream &is,Date &a);private:int y,m,d;int DayforMonth(int y,int m)const;int ToInt(int yy,int mm)const;void r_set();};#endif

.cpp文件

<pre name="code" class="cpp">/*** *  bate:1.1.1 *  use:Date class *  aythor: haohdq * ***/<pre name="code" class="cpp">/***  日期类 ***/#include <iostream>#include "date.h"// 得到每个月的天数int Date::DayforMonth(int y,int m)const{int d=0;switch(m){case 1:case 3:case 5:case 7:case 8:case 10:case 12:d=31;break;case 4:case 6:case 9:case 11:d=30;break;case 2:d=28+is_p_year(y);break;}return d;}int Date::ToInt(int yy=1,int mm=1)const{int sum=0;for(int i=yy;i<y;i++){sum+=365+is_p_year(i);}for(int i=mm;i<m;i++){sum+=DayforMonth(y,m);}sum+=d;return sum;}void Date::r_set(){while(d>DayforMonth(y,m)){//大于d-=DayforMonth(y,m);m++;if(m>12){++(y);m=1;}}while(d<1){m--;if(m<1){y--;m=12;}d+=DayforMonth(y,m);}}////////////日期加天数Date operator + (const int v,const Date a){Date d=a;if(v==0) return d;if(v>0){d.d+=v;d.r_set();return d;}return d-(-v);}Date operator +(const Date a,const int v){return v+a;}Date& Date::operator +=(const int v){if(v==0)return *this;if(v>0){d+=v;r_set();return *this;}else return *this-=(-v);}Date& Date::operator -=(const int v){    if(v==0)return *this;    if(v>0){        d-=v;        r_set();        return *this;    }    else return *this+=(-v);}Date& Date::operator ++(){d++;r_set();return *this;}Date  Date::operator ++(int){    Date b=*this;    d++;    r_set();    return b;}Date operator -(const Date a,const int v){Date b=a;if(v==0)return b;if(v>0){b.d--;b.r_set();return b;}else return b+(-v);}int operator-(const Date a,const Date b){return a.ToInt()-b.ToInt();}Date& Date::operator --(){d--;r_set();return *this;}Date  Date::operator --(int){    Date b=*this;    d--;    r_set();    return b;}bool operator ==(const Date a,const Date b){return a.ToInt()==b.ToInt();}bool operator !=(const Date a,const Date b){return !(a==b);}bool operator >(const Date a,const Date b){return a.ToInt()>b.ToInt();}bool operator >=(const Date a,const Date b){return a>b||a==b;}bool operator <(const Date a,const Date b){return !(a>=b);}bool operator <=(const Date a,const Date b){return a<b||a==b;}std::ostream& operator <<(std::ostream &os,const Date &a){    os<<a.y<<'-'<<a.m<<'-'<<a.d;    return os;}std::istream& operator >>(std::istream &in,Date &a){    std::string h;    in>>h;    Date b(h);    a=b;    return in;}

0 0