WinHttpTimeToSystemTime function (winhttp.h)

Article
02/22/2024

The WinHttpTimeToSystemTime function takes an HTTP time/date string and converts it to a SYSTEMTIME structure.

Syntax

WINHTTPAPI BOOL WinHttpTimeToSystemTime(
  [in]  LPCWSTR    pwszTime,
  [out] SYSTEMTIME *pst
);

Parameters

[in] pwszTime

Pointer to a null-terminated date/time string to convert. This value must use the format defined in section 3.3 of the RFC2616.

[out] pst

Pointer to the SYSTEMTIME structure that receives the converted time.

Return value

Returns TRUE if successful, or FALSE otherwise. For extended error information, call GetLastError. Among the error codes returned is:

Error Code	Description
ERROR_WINHTTP_INTERNAL_ERROR	An internal error has occurred.

Remarks

Even when WinHTTP is used in asynchronous mode (that is, when WINHTTP_FLAG_ASYNC has been set in WinHttpOpen), this function operates synchronously. The return value indicates success or failure. To get extended error information, call GetLastError.

Note For Windows XP and Windows 2000, see the Run-Time Requirements section of the WinHttp start page.

Examples

This example shows how to convert an HTTP formatted date to a SYSTEMTIME structure.

    SYSTEMTIME  sTime;
    LPCWSTR     pwszTimeStr = L"Tue, 21 Nov 2000 01:06:53 GMT";

    // Convert the HTTP string to a SYSTEMTIME structure.
    if (!WinHttpTimeToSystemTime( pwszTimeStr, &sTime))
    {
        printf( "Error %u in WinHttpTimeToSystemTime.\n", GetLastError());
    }
    else
    {
        // Print the date.
        printf( "The U.S. formatted date is (%u/%u/%u)\n", 
                sTime.wMonth, sTime.wDay, sTime.wYear);
    }

Requirements

Requirement	Value
Minimum supported client	Windows XP, Windows 2000 Professional with SP3 [desktop apps only]
Minimum supported server	Windows Server 2003, Windows 2000 Server with SP3 [desktop apps only]
Target Platform	Windows
Header	winhttp.h
Library	Winhttp.lib
DLL	Winhttp.dll
Redistributable	WinHTTP 5.0 and Internet Explorer 5.01 or later on Windows XP and Windows 2000.

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