C++ Builder 參考手冊 ? System::Dateutils ? WeekOfTheMonth

這個日期時間在這一個月的第幾周 (ISO 8601)

頭文件：#include <System.DateUtils.hpp>
命名空間：System::Dateutils
函數(shù)原型：

System::Word __fastcall WeekOfTheMonth(
    const System::TDateTime AValue);

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

參數(shù)：

• AValue：日期時間類型變量缸兔；
• AYear：返回這個日期的年蚓挤，1 - 9999允坚；
• AMonth：返回這個日期的月，1 - 12胎食；

返回值：

• 返回值為 AValue 日期時間在 AYear 年 AMonth 月的第幾周 (ISO 8601)，范圍 1 - 5肴颊；
• 一個月一共有 4 或 5 周奸例，這些周的分配規(guī)則請參考 IsValidDateWeek；
• 一年一共有 52 或 53 周赡模，有關(guān)一年有多少周請參考 WeeksInYear田炭；
• 可以使用函數(shù) WeekOfTheYear 獲取一個日期時間在一年的第幾周 。

例：

#include <System.DateUtils.hpp>
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    TDateTime dt = Sysutils::Now();
    Memo1->Lines->Add(L"現(xiàn)在時間 " + 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"這一周從 " + FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz",t0)
                    + L" 到 "      + FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz",t1));

    unsigned short iMonth;
    iWeek = WeekOfTheMonth(dt, iYear, iMonth);
    Memo1->Lines->Add(String().sprintf(L"今天是 %d 年 %d 月的第 %d 周", iYear, iMonth, iWeek));
}

運行結(jié)果：

相關(guān)：

• 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::HourOfTheYear
• System::Dateutils::IsValidDateMonthWeek
• System::Dateutils::IsValidDateWeek
• System::Dateutils::MilliSecondOf
• System::Dateutils::MilliSecondOfTheYear
• System::Dateutils::MinuteOf
• System::Dateutils::MinuteOfTheYear
• System::Dateutils::MonthOf
• System::Dateutils::MonthOfTheYear
• System::Dateutils::SecondOf
• System::Dateutils::SecondOfTheYear
• System::Dateutils::TimeOf
• System::Dateutils::TryEncodeDateTime
• System::Dateutils::UnixToDateTime
• System::Dateutils::WeekOfTheMonth
• System::Dateutils::WeekOfTheYear
• 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 參考手冊 ? System::Dateutils ? WeekOfTheMonth