Swift

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).

Swift

func chilkatTest() {
    var success: Bool = false

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

    let socket = CkoSocket()!

    // Connect to an NIST time server and read the current date/time
    var maxWaitMs: Int = 4000
    var useTls: Bool = false
    success = socket.connect(hostname: "time-c.nist.gov", port: 37, ssl: useTls, maxWaitMs: maxWaitMs)
    if success != true {
        print("\(socket.lastErrorText!)")
        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.
    var bigEndian: Bool = true
    success = socket.receiveInt32(bigEndian: bigEndian)
    if success != true {
        print("\(socket.lastErrorText!)")
        return
    }

    let dt = CkoDateTime()!
    dt.set(fromNtpTime: socket.receivedInt.intValue)

    // Show the current local date/time
    var bLocalTime: Bool = true
    print("Current local date/time: \(dt.get(asRfc822: bLocalTime)!)")

    maxWaitMs = 10
    socket.close(maxWaitMs: maxWaitMs)

}