Unicode C

Get Current Date/Time from NIST Time Server

See more Socket/SSL/TLS Examples

Demonstrates using Chilkat Socket to connect to an NIST time server and (using the old Time Protocol (RFC 868)), will read the current GMT time.

Note: This is not necessarily the very best means for getting the current date/time. The most commonly used time protocol is the Network Time Protocol (RFC-1305).

Unicode C

#include <C_CkSocketW.h>
#include <C_CkDateTimeW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSocketW socket;
    int maxWaitMs;
    BOOL useTls;
    BOOL bigEndian;
    HCkDateTimeW dt;
    BOOL bLocalTime;

    success = FALSE;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    socket = CkSocketW_Create();

    // Connect to an NIST time server and read the current date/time
    maxWaitMs = 4000;
    useTls = FALSE;
    success = CkSocketW_Connect(socket,L"time-c.nist.gov",37,useTls,maxWaitMs);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(socket));
        CkSocketW_Dispose(socket);
        return;
    }

    // The time server will send a big-endian 32-bit integer representing
    // the number of seconds since since 00:00 (midnight) 1 January 1900 GMT.
    // The ReceiveInt32 method will receive a 4-byte integer, but returns
    // TRUE or FALSE to indicate success.  If successful, the integer
    // is obtained via the ReceivedInt property.
    bigEndian = TRUE;
    success = CkSocketW_ReceiveInt32(socket,bigEndian);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(socket));
        CkSocketW_Dispose(socket);
        return;
    }

    dt = CkDateTimeW_Create();
    CkDateTimeW_SetFromNtpTime(dt,CkSocketW_getReceivedInt(socket));

    // Show the current local date/time
    bLocalTime = TRUE;
    wprintf(L"Current local date/time: %s\n",CkDateTimeW_getAsRfc822(dt,bLocalTime));

    maxWaitMs = 10;
    CkSocketW_Close(socket,maxWaitMs);


    CkSocketW_Dispose(socket);
    CkDateTimeW_Dispose(dt);

    }