Question

How to convert FILETIME from WinApi (e.g. from result of a call to this WINAPI function to DateTime in vb6? (e.g. if I want to use it as input to the DateTime.DateDiff function.)

Answer 1

Public Type FILETIME
    dwLowDateTime As Long
    dwHighDateTime As Long
End Type

Public Type SYSTEMTIME
    wYear As Integer
    wMonth As Integer
    wDayOfWeek As Integer
    wDay As Integer
    wHour As Integer
    wMinute As Integer
    wSecond As Integer
    wMilliseconds As Integer
End Type

Private Declare Function FileTimeToSystemTime Lib "kernel32" (lpFileTime As FILETIME, lpSystemTime As SYSTEMTIME) As Long
Private Declare Function SystemTimeToVariantTime Lib "OLEAUT32.DLL" (lpSystemTime As SYSTEMTIME, vtime As Date) As Long

Dim st As SYSTEMTIME
Dim dt As Date

' convert a FILETIME to SYSTEMTIME first
FileTimeToSystemTime ft, st

' convert the SYSTEMTIME to a Variant date (VT_DATE)
SystemTimeToVariantTime st, dt