Yesterday - C++ Builder

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

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获取昨天的日期

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

System::TDateTime __fastcall Yesterday(void);

参数：

• 无；

返回值：

• 获取昨天的日期，时间部分等于 0，即 00:00:00；
• 由于日期时间类型的变量值是按照天数表示的，所以 Yesterday 就相当于函数 Today 或 Date 得到的数值 - 1

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例：测试和比较函数 Now、Date、Time、DateOf、TimeOf、Today、Yesterday、Tomorrow：

#include 
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    Sysutils::FormatSettings.ShortDateFormat = L"yyyy'年'mm'月'dd'日'";
    Sysutils::FormatSettings.LongTimeFormat = L"hh:nn:ss";

    Memo1->Lines->Add(Sysutils::Now());
    Memo1->Lines->Add(Dateutils::DateOf(Sysutils::Now()));
    Memo1->Lines->Add(Sysutils::Date());
    Memo1->Lines->Add(Dateutils::TimeOf(Sysutils::Now()));
    Memo1->Lines->Add(Sysutils::Time());
    Memo1->Lines->Add(Dateutils::Today());
    Memo1->Lines->Add(Dateutils::Today()-1);
    Memo1->Lines->Add(Dateutils::Yesterday());
    Memo1->Lines->Add(Dateutils::Today()+1);
    Memo1->Lines->Add(Dateutils::Tomorrow());
}

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相关：

• System::Dateutils::Today
• System::Dateutils::Yesterday
• System::Dateutils::Tomorrow
• System::Dateutils::DateOf
• System::Dateutils::TimeOf
• System::Dateutils::IsToday
• System::Dateutils::IsSameDay
• System::Dateutils
• System::Sysutils::CurrentYear
• System::Sysutils::Date
• System::Sysutils::Now
• System::Sysutils::Time
• System::Sysutils

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