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## org.apache.commons.net
Class TimeUDPClient

    java.lang.Object
      org.apache.commons.net.DatagramSocketClient
          org.apache.commons.net.TimeUDPClient

public final class TimeUDPClient
extends DatagramSocketClient

The TimeUDPClient class is a UDP implementation of a client for the Time protocol described in RFC 868. To use the class, merely open a local datagram socket with `open` and call `getTime` or `getDate` to retrieve the time. Then call `close` to close the connection properly. Unlike `TimeTCPClient`, successive calls to `getTime` or `getDate` are permitted without re-establishing a connection. That is because UDP is a connectionless protocol and the Time protocol is stateless.

Author:
  Daniel F. Savarese
See Also:
  `TimeTCPClient`

Field Summary
`static int` | `DEFAULT_PORT` The default time port.
`static long` | `SECONDS_1900_TO_1970` The number of seconds between 00:00 1 January 1900 and 00:00 1 January 1970.

Fields inherited from class org.apache.commons.net.DatagramSocketClient
`_isOpen_, _socket_, _socketFactory_, _timeout_`

Constructor Summary
`TimeUDPClient()`

Method Summary
`Date` | `getDate(InetAddress host)` Same as `getTime(host, DEFAULT_PORT);`
`Date` | `getDate(InetAddress host, int port)` Retrieves the time from the server and returns a Java Date containing the time converted to the local timezone.
`long` | `getTime(InetAddress host)` Same as `getTime(host, DEFAULT_PORT);`
`long` | `getTime(InetAddress host, int port)` Retrieves the time from the specified server and port and returns it.

Methods inherited from class org.apache.commons.net.DatagramSocketClient
`close, getDefaultTimeout, getLocalAddress, getLocalPort, getSoTimeout, isOpen, open, open, open, setDatagramSocketFactory, setDefaultTimeout, setSoTimeout`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_PORT

    public static final int DEFAULT_PORT

  The default time port. It is set to 37 according to RFC 868.

  See Also:
    Constant Field Values

### SECONDS_1900_TO_1970

    public static final long SECONDS_1900_TO_1970

  The number of seconds between 00:00 1 January 1900 and 00:00 1 January 1970. This value can be useful for converting time values to other formats.

  See Also:
    Constant Field Values

Constructor Detail

### TimeUDPClient

    public TimeUDPClient()

Method Detail

### getTime

    public long getTime(InetAddress host,
                        int port)
                 throws IOException

  Retrieves the time from the specified server and port and returns it. The time is the number of seconds since 00:00 (midnight) 1 January 1900 GMT, as specified by RFC 868. This method reads the raw 32-bit big-endian unsigned integer from the server, converts it to a Java long, and returns the value.

  Parameters:
    `host` - The address of the server.
    `port` - The port of the service.
  Returns:
    The time value retrieved from the server.
  Throws:
    `IOException` - If an error occurs while retrieving the time.

### getTime

    public long getTime(InetAddress host)
                 throws IOException

  Same as `getTime(host, DEFAULT_PORT);`

  Throws:
    `IOException`

### getDate

    public Date getDate(InetAddress host,
                        int port)
                 throws IOException

  Retrieves the time from the server and returns a Java Date containing the time converted to the local timezone.

  Parameters:
    `host` - The address of the server.
    `port` - The port of the service.
  Returns:
    A Date value containing the time retrieved from the server converted to the local timezone.
  Throws:
    `IOException` - If an error occurs while fetching the time.

### getDate

    public Date getDate(InetAddress host)
                 throws IOException

  Same as `getTime(host, DEFAULT_PORT);`

  Throws:
    `IOException`

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