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C++實現(xiàn)比較日期大小的示例代碼

更新時間：2023年04月04日 15:29:43 作者：歐特克_Glodon

這篇文章主要為大家詳細(xì)介紹了如何使用C++實現(xiàn)比較日期大小的功能，文中的示例代碼講解詳細(xì)，具有一定的學(xué)習(xí)價值，感興趣的可以了解一下

一、目的

用來比較兩個日期。日期格式：2023-03-31 09:16:56。

二、代碼

//std::wstring strA = L"2023-03-31 09:16:56";
//std::wstring strB = L"2023-03-31 09:21:34";
bool LessThanEx(std::wstring strA, std::wstring strB)
{
	std::wstring strLeftA, strRightA;
	std::wstring strLeftB, strRightB;
	{
		std::wstring strLeft, strRight;
		std::size_t nIndex = strA.find(L" ");
		if (nIndex!=std::string::npos)
		{
			strLeft = strA.substr(0,nIndex);
			strRight = strA.substr(nIndex+1);

			std::wstring wsDivide = L"-";
			strLeft.replace(strLeft.find(wsDivide),wsDivide.length(),L"");
			strLeft.replace(strLeft.find(wsDivide),wsDivide.length(),L"");

			wsDivide = L":";
			strRight.replace(strRight.find(wsDivide),wsDivide.length(),L"");
			strRight.replace(strRight.find(wsDivide),wsDivide.length(),L"");
		}

		strLeftA = strLeft;
		strRightA = strRight;
	}

	{
		std::wstring strLeft, strRight;
		std::size_t nIndex = strB.find(L" ");
		if (nIndex!=std::string::npos)
		{
			strLeft = strB.substr(0,nIndex);
			strRight = strB.substr(nIndex+1);

			std::wstring wsDivide = L"-";
			strLeft.replace(strLeft.find(wsDivide),wsDivide.length(),L"");
			strLeft.replace(strLeft.find(wsDivide),wsDivide.length(),L"");

			wsDivide = L":";
			strRight.replace(strRight.find(wsDivide),wsDivide.length(),L"");
			strRight.replace(strRight.find(wsDivide),wsDivide.length(),L"");
		}

		strLeftB = strLeft;
		strRightB = strRight;
	}

	__int64 nLeftA = std::stoi(strLeftA);
	__int64 nLeftB = std::stoi(strLeftB);

	__int64 nRightA = std::stoi(strRightA);
	__int64 nRightB = std::stoi(strRightB);
	if(nLeftA < nLeftB)
	{
		return true;
	}
	else if(nLeftA > nLeftB)
	{
		return false;
	}
	else
	{
		if(nRightA >= nRightB)
		{
			return false;
		}
		
		return true;
	}

	return true;
}

//CString strA = _T("2023-03-31 09:16:56");
//CString strB = _T("2023-03-31 09:21:34");
bool LessThan(CString strA, CString strB)
{
	CString strLeftA, strRightA;
	CString strLeftB, strRightB;
	{
		CString strLeft, strRight;
		int nIndex = strA.Find(_T(" "));
		if (nIndex > -1)
		{
			strLeft = strA.Left(nIndex);
			strRight = strA.Mid(nIndex+1,strA.GetLength() - nIndex-1);

			strLeft.Replace(_T("-"),_T(""));
			strRight.Replace(_T(":"),_T(""));
		}

		strLeftA = strLeft;
		strRightA = strRight;
	}

	{
		CString strLeft, strRight;
		int nIndex = strB.Find(_T(" "));
		if (nIndex > -1)
		{
			strLeft = strB.Left(nIndex);
			strRight = strB.Mid(nIndex+1,strB.GetLength() - nIndex-1);

			strLeft.Replace(_T("-"),_T(""));
			strRight.Replace(_T(":"),_T(""));
		}

		strLeftB = strLeft;
		strRightB = strRight;
	}

	__int64 nLeftA = _tstoi64(strLeftA);
	__int64 nLeftB = _tstoi64(strLeftB);

	__int64 nRightA = _tstoi64(strRightA);
	__int64 nRightB = _tstoi64(strRightB);
	if(nLeftA < nLeftB)
	{
		return true;
	}
	else if(nLeftA > nLeftB)
	{
		return false;
	}
	else
	{
		if(nRightA >= nRightB)
		{
			return false;
		}

		return true;
	}

	return true;
}

三、補(bǔ)充

除了比較大小，C++還可以實現(xiàn)計算日期相差多少天，下面是實現(xiàn)代碼，希望對大家有所幫助

#include <iostream>
#include <stdio.h>
#include <algorithm>
using namespace std;
bool isLeap(int year) {
	return (year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0);
}
int main() {
	//定義好平年和閏年每月的天數(shù)
	int monthDays[13][2] = {
		{0,0},{31,31},{28,29},{30,30},{31,31},{30,30},
		{31,31},{30,30},{31,31},{30,30},{31,31},{30,30},
		{31,31}
	};
	int time1, year1, month1, days1;
	int time2, year2, month2, days2;
	int numbers =1;
	// 輸入兩個日期
	cout << "輸入兩個日期，空格分隔";
	cin >> time1 >> time2;
	if (time1>time2){
		int temp = time1;
		time1 = time2;
		time2 = temp;

	}
	//拆解日期，分為年，月，號
	year1 = time1 / 10000; month1 = time1 / 100 % 100; days1 = time1 % 100;
	year2 = time2 / 10000; month2 = time2 / 100 % 100; days2 = time2 % 100;
	//第一個日期 累加到 第二個日期
	while (year1 < year2 || month1 < month2 || days1 < days2) {
		days1++;// 在第一個日期基礎(chǔ)上  加一天
		//加一天后，相應(yīng)的月，年可能也要做一定的變化
		if (days1 == monthDays[month1][isLeap(year1)]+1) {//當(dāng)前號超過當(dāng)前月最高天數(shù)：月份加1，號變成下月的1號
			month1++;
			days1 = 1;
		}
		if (month1 == 13) {//月份超過12個月 ：年份加1,月份變成下年的1月
			year1++;
			month1 = 1;
		}
		numbers++;
	}
	cout << numbers << endl;
	return 0;
}

到此這篇關(guān)于C++實現(xiàn)比較日期大小的示例代碼的文章就介紹到這了,更多相關(guān)C++比較日期大小內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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