VariantTimeToDosDateTime

// OLEAUT32.dll
#include <windows.h>

INT VariantTimeToDosDateTime(
    DOUBLE vtime,
    WORD* pwDosDate,
    WORD* pwDosTime
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VariantTimeToDosDateTime(
    vtime As Double,   ' DOUBLE
    <Out> ByRef pwDosDate As UShort,   ' WORD* out
    <Out> ByRef pwDosTime As UShort   ' WORD* out
) As Integer
End Function

' vtime : DOUBLE
' pwDosDate : WORD* out
' pwDosTime : WORD* out
Declare PtrSafe Function VariantTimeToDosDateTime Lib "oleaut32" ( _
    ByVal vtime As Double, _
    ByRef pwDosDate As Integer, _
    ByRef pwDosTime As Integer) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VariantTimeToDosDateTime = ctypes.windll.oleaut32.VariantTimeToDosDateTime
VariantTimeToDosDateTime.restype = ctypes.c_int
VariantTimeToDosDateTime.argtypes = [
    ctypes.c_double,  # vtime : DOUBLE
    ctypes.POINTER(ctypes.c_ushort),  # pwDosDate : WORD* out
    ctypes.POINTER(ctypes.c_ushort),  # pwDosTime : WORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VariantTimeToDosDateTime = Fiddle::Function.new(
  lib['VariantTimeToDosDateTime'],
  [
    Fiddle::TYPE_DOUBLE,  # vtime : DOUBLE
    Fiddle::TYPE_VOIDP,  # pwDosDate : WORD* out
    Fiddle::TYPE_VOIDP,  # pwDosTime : WORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VariantTimeToDosDateTime(
        vtime: f64,  // DOUBLE
        pwDosDate: *mut u16,  // WORD* out
        pwDosTime: *mut u16  // WORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VariantTimeToDosDateTime(double vtime, out ushort pwDosDate, out ushort pwDosTime);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VariantTimeToDosDateTime' -Namespace Win32 -PassThru
# $api::VariantTimeToDosDateTime(vtime, pwDosDate, pwDosTime)

#uselib "OLEAUT32.dll"
#func global VariantTimeToDosDateTime "VariantTimeToDosDateTime" double, sptr, sptr
; VariantTimeToDosDateTime vtime, varptr(pwDosDate), varptr(pwDosTime)   ; 戻り値は stat
; vtime : DOUBLE -> "double"
; pwDosDate : WORD* out -> "sptr"
; pwDosTime : WORD* out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "OLEAUT32.dll"
#cfunc global VariantTimeToDosDateTime "VariantTimeToDosDateTime" double, var, var
; res = VariantTimeToDosDateTime(vtime, pwDosDate, pwDosTime)
; vtime : DOUBLE -> "double"
; pwDosDate : WORD* out -> "var"
; pwDosTime : WORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; INT VariantTimeToDosDateTime(DOUBLE vtime, WORD* pwDosDate, WORD* pwDosTime)
#uselib "OLEAUT32.dll"
#cfunc global VariantTimeToDosDateTime "VariantTimeToDosDateTime" double, var, var
; res = VariantTimeToDosDateTime(vtime, pwDosDate, pwDosTime)
; vtime : DOUBLE -> "double"
; pwDosDate : WORD* out -> "var"
; pwDosTime : WORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVariantTimeToDosDateTime = oleaut32.NewProc("VariantTimeToDosDateTime")
)

// vtime (DOUBLE), pwDosDate (WORD* out), pwDosTime (WORD* out)
r1, _, err := procVariantTimeToDosDateTime.Call(
	uintptr(math.Float64bits(vtime)),
	uintptr(pwDosDate),
	uintptr(pwDosTime),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT
// 注意: float/double 引数は proc.Call では XMM レジスタに渡せません。
// windows.SyscallN(proc.Addr(), math.Float64bits(x), ...) もしくは cgo を使用してください。

function VariantTimeToDosDateTime(
  vtime: Double;   // DOUBLE
  pwDosDate: Pointer;   // WORD* out
  pwDosTime: Pointer   // WORD* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VariantTimeToDosDateTime';

result := DllCall("OLEAUT32\VariantTimeToDosDateTime"
    , "Double", vtime   ; DOUBLE
    , "Ptr", pwDosDate   ; WORD* out
    , "Ptr", pwDosTime   ; WORD* out
    , "Int")   ; return: INT

●VariantTimeToDosDateTime(vtime, pwDosDate, pwDosTime) = DLL("OLEAUT32.dll", "int VariantTimeToDosDateTime(double, void*, void*)")
# 呼び出し: VariantTimeToDosDateTime(vtime, pwDosDate, pwDosTime)
# vtime : DOUBLE -> "double"
# pwDosDate : WORD* out -> "void*"
# pwDosTime : WORD* out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。