EndOfAMonth - C++ Builder

C++ Builder 参考手册 ➙ System::Dateutils ➙ EndOfAMonth


某个月的开始时间,这一个月的最后一天 23:59:59.999

头文件:#include
命名空间:System::Dateutils
函数原型:

System::TDateTime __fastcall EndOfAMonth(const System::Word AYear, const System::Word AMonth);

参数:

  • AYear:年,1 - 9999;
  • AMonth:月,1 - 12;

返回值:

  • AYear 年 AMonth 月的开始时间,这一个月最后一天的 23:59:59.999;
  • 在程序里面,通常判断小于下个月1日00:00:00,而不是判断小于等于这个月的末尾时间;
  • 比较函数 EndOfAMonth 和 EndOfTheMonth:
    • EndOfAMonth 的参数是整数年、月;
    • EndOfTheMonth 的参数是日期时间;
    只要这两个函数参数的年月和日期的年月相同,返回值就相同。

例:

#include 
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    TDateTime dt = Sysutils::Now();
    Memo1->Lines->Add(FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz", dt));
    Memo1->Lines->Add(FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz", StartOfTheMonth(dt)));
    Memo1->Lines->Add(FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz", EndOfTheMonth(dt)));

    unsigned short iYear = Dateutils::YearOf(dt);
    unsigned short iMonth = Dateutils::MonthOf(dt);
    Memo1->Lines->Add(String().sprintf(L"%d年%d月", iYear, iMonth));
    Memo1->Lines->Add(FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz", StartOfAMonth(iYear,iMonth)));
    Memo1->Lines->Add(FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz", EndOfAMonth(iYear,iMonth)));
}

运行结果:


相关:

  • System::Dateutils::StartOfTheYear
  • System::Dateutils::EndOfTheYear
  • System::Dateutils::StartOfTheMonth
  • System::Dateutils::EndOfTheMonth
  • System::Dateutils::StartOfTheWeek
  • System::Dateutils::EndOfTheWeek
  • System::Dateutils::StartOfTheDay
  • System::Dateutils::EndOfTheDay
  • System::Dateutils::StartOfAYear
  • System::Dateutils::EndOfAYear
  • System::Dateutils::StartOfAMonth
  • System::Dateutils::EndOfAMonth
  • System::Dateutils::StartOfAWeek
  • System::Dateutils::EndOfAWeek
  • System::Dateutils::StartOfADay
  • System::Dateutils::EndOfADay
  • System::Dateutils::DaysInYear
  • System::Dateutils::DaysInAYear
  • System::Dateutils::DaysInMonth
  • System::Dateutils::DaysInAMonth
  • System::Dateutils::WeeksInYear
  • System::Dateutils::WeeksInAYear
  • System::Dateutils

C++ Builder 参考手册 ➙ System::Dateutils ➙ EndOfAMonth

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