c++builder中日期時間控制元件Tdatetimepicker不能同時更改日期和時間，只好用了2個控制元件，其中一個kind屬性改為dtkTime表明是時間，另一個預設是日期，設定2個空間change事件聯動，最後取值與time_t轉換

void __fastcall TmodifyoperationForm::dtpChange(TObject *Sender)

{

     if(this->dtp2->Date != this->dtp->Date)

        this->dtp2->Date = this->dtp->Date;

}

void __fastcall TmodifyoperationForm::dtp2Change(TObject *Sender)

{

   if(this->dtp->Time != this->dtp2->Time)

        this->dtp->Time = this->dtp2->Time;

}

TDateTime   Time_t_to_TDateTime(time_t   t)

{

struct   tm   *tmWk;

SYSTEMTIME   SystemTime;

tmWk   =   localtime(&t); 

SystemTime.wYear   =   tmWk-> tm_year   +   1900; 

SystemTime.wMonth   =   tmWk-> tm_mon   +   1;; 

SystemTime.wDay   =   tmWk-> tm_mday; 

SystemTime.wHour   =tmWk-> tm_hour; 

SystemTime.wMinute   =tmWk-> tm_min; 

SystemTime.wSecond   =tmWk-> tm_sec; 

SystemTime.wMilliseconds   =   0;

return   SystemTimeToDateTime(SystemTime);

}

dtp->DateTime=Time_t_to_TDateTime(datetime);//給控制元件賦值

#include   <DateUtils.hpp>

time_t t=SecondsBetween( this->dtp->DateTime,25569 );從控制元件得到值