(PureBasic) Get Current Date/Time from NIST Time Server

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).

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IncludeFile "CkDateTime.pb"
IncludeFile "CkSocket.pb"

Procedure ChilkatExample()

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

    socket.i = CkSocket::ckCreate()
    If socket.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect to an NIST time server and read the current date/time
    maxWaitMs.i = 4000
    useTls.i = 0
    success.i = CkSocket::ckConnect(socket,"time-c.nist.gov",37,useTls,maxWaitMs)
    If success <> 1
        Debug CkSocket::ckLastErrorText(socket)
        CkSocket::ckDispose(socket)
        ProcedureReturn
    EndIf

    ; 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
    ; 1 or 0 to indicate success.  If successful, the integer
    ; is obtained via the ReceivedInt property.
    bigEndian.i = 1
    success = CkSocket::ckReceiveInt32(socket,bigEndian)
    If success <> 1
        Debug CkSocket::ckLastErrorText(socket)
        CkSocket::ckDispose(socket)
        ProcedureReturn
    EndIf

    dt.i = CkDateTime::ckCreate()
    If dt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkDateTime::ckSetFromNtpTime(dt,CkSocket::ckReceivedInt(socket))

    ; Show the current local date/time
    bLocalTime.i = 1
    Debug "Current local date/time: " + CkDateTime::ckGetAsRfc822(dt,bLocalTime)

    maxWaitMs = 10
    CkSocket::ckClose(socket,maxWaitMs)


    CkSocket::ckDispose(socket)
    CkDateTime::ckDispose(dt)


    ProcedureReturn
EndProcedure