一、目的
用来比较两个日期。日期格式：2023-03-31 09:16:56。
二、代码
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//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、补充
除了比较大小，C++还可以实现计算日期相差多少天，下面是实现代码，希望对大家有所帮助
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#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() { //定义好平年和闰年每月的天数 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; // 输入两个日期 cout << "输入两个日期，空格分隔"; cin >> time1 >> time2; if (time1>time2){ int temp = time1; time1 = time2; time2 = temp; } //拆解日期，分为年，月，号 year1 = time1 / 10000; month1 = time1 / 100 % 100; days1 = time1 % 100; year2 = time2 / 10000; month2 = time2 / 100 % 100; days2 = time2 % 100; //第一个日期 累加到 第二个日期 while (year1 < year2 || month1 < month2 || days1 < days2) { days1++;// 在第一个日期基础上 加一天 //加一天后，相应的月，年可能也要做一定的变化 if (days1 == monthDays[month1][isLeap(year1)]+1) {//当前号超过当前月最高天数：月份加1，号变成下月的1号 month1++; days1 = 1; } if (month1 == 13) {//月份超过12个月 ：年份加1,月份变成下年的1月 year1++; month1 = 1; } numbers++; } cout << numbers << endl; return 0;} |
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原文链接：https://blog.csdn.net/m0_37251750/article/details/129951190
