WeekOfTheYear - C++ Builder

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


这个日期时间在这一年的第几周 (ISO 8601)

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

System::Word __fastcall WeekOfTheYear(const System::TDateTime AValue);
System::Word __fastcall WeekOfTheYear(const System::TDateTime AValue, System::Word &AYear);

参数:

  • AValue:日期时间类型变量;
  • AYear:返回这个日期的年,1 - 9999;

返回值:

  • 返回值为 AValue 日期时间在这一年的第几周 (ISO 8601),范围 1 - 53
  • 一年一共有 52 或 53 周,有关一年有多少周请参考 WeeksInYear,这些周的分配规则请参考 IsValidDateWeek;
  • 比较函数 WeekOfTheYear 和 WeekOf:
    • WeekOfTheYear:有可选参数 AYear 返回年,函数返回第几周;
    • WeekOf:只返回第几周;
    这两个函数的返回值相同。

例:

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

    unsigned short iYear;
    unsigned short iWeek = WeekOfTheYear(dt, iYear);
    Memo1->Lines->Add(String().sprintf(L"今天是 %d 年的第 %d 周", iYear, iWeek));

    TDateTime t0 = StartOfAWeek(iYear, iWeek);
    TDateTime t1 = EndOfAWeek(iYear, iWeek);
    Memo1->Lines->Add(L"这一周从 " + FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz",t0)
                    + L" 到 "      + FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz",t1));
}

运行结果:


相关:

  • System::Dateutils::WeekOfTheMonth
  • System::Dateutils::MonthOfTheYear
  • System::Dateutils::WeekOfTheYear
  • System::Dateutils::DayOfTheYear
  • System::Dateutils::HourOfTheYear
  • System::Dateutils::MinuteOfTheYear
  • System::Dateutils::SecondOfTheYear
  • System::Dateutils::MilliSecondOfTheYear
  • System::Dateutils::DateOf
  • System::Dateutils::DateTimeToUnix
  • System::Dateutils::DayOf
  • System::Dateutils::DayOfTheMonth
  • System::Dateutils::DayOfTheWeek
  • System::Dateutils::DayOfTheYear
  • System::Dateutils::DecodeDateTime
  • System::Dateutils::EncodeDateTime
  • System::Dateutils::HourOf
  • System::Dateutils::IsValidDateWeek
  • System::Dateutils::MilliSecondOf
  • System::Dateutils::MinuteOf
  • System::Dateutils::MonthOf
  • System::Dateutils::SecondOf
  • System::Dateutils::TimeOf
  • System::Dateutils::TryEncodeDateTime
  • System::Dateutils::UnixToDateTime
  • System::Dateutils::WeeksInYear
  • System::Dateutils::YearOf
  • System::Dateutils
  • System::Sysutils::CurrentYear
  • System::Sysutils::Date
  • System::Sysutils::DecodeDate
  • System::Sysutils::DecodeDateFully
  • System::Sysutils::DecodeTime
  • System::Sysutils::EncodeDate
  • System::Sysutils::EncodeTime
  • System::Sysutils::FormatDateTime
  • System::Sysutils::Now
  • System::Sysutils::Time
  • System::Sysutils::TryEncodeDate
  • System::Sysutils::TryEncodeTime
  • System::Sysutils::TryStrToDate
  • System::Sysutils::TryStrToDateTime
  • System::Sysutils::TryStrToTime
  • System::Sysutils

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

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