C++ Builder 参考手册 ➙ System::Dateutils ➙ StartOfTheWeek
这个日期时间所在周的开始时间 (ISO 8601),这周的星期一 00:00:00.000
头文件:#include <System.DateUtils.hpp>
命名空间:System::Dateutils
函数原型:
System::TDateTime __fastcall StartOfTheWeek(const System::TDateTime AValue);
参数:
- AValue:日期时间;
返回值:
- 这个日期时间所在周的开始时间 (ISO 8601),这周的星期一 00:00:00.000;
- 按照 ISO 8601 国际标准 (中国使用这个标准),每周星期一为第一天,星期日为最后一天,详细描述请参考 IsValidDateWeek;
- 比较函数 StartOfAWeek 和 StartOfTheWeek:
• StartOfAWeek 的参数是整数年、第几周、星期几;这个函数可以获取这一周每一天的开始时间,不限于星期一;
• StartOfTheWeek 的参数是日期时间,这个函数只获取这一周星期一的开始时间。
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", StartOfTheWeek(dt)));
Memo1->Lines->Add(FormatDateTime(L"yyyy/mm/dd hh:nn:ss.zzz", EndOfTheWeek(dt)));
}
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::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 ➙ StartOfTheWeek
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