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 <System.DateUtils.hpp>
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 <System.DateUtils.hpp>
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
