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