Lua

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).

Lua

local chilkat = require("chilkat")

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

local socket = chilkat.Socket.new()

-- Connect to an NIST time server and read the current date/time
local maxWaitMs = 4000
local useTls = false
local success = socket:connect("time-c.nist.gov", 37, useTls, maxWaitMs)
if not success then
    print(socket.last_error_text)
    return
end

-- 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.
local bigEndian = true
success = socket:receive_int32(bigEndian)
if not success then
    print(socket.last_error_text)
    return
end

local dt = chilkat.DateTime.new()
dt:set_from_ntp_time(socket.received_int)

-- Show the current local date/time
local bLocalTime = true
print("Current local date/time: " .. dt:get_as_rfc822(bLocalTime))

maxWaitMs = 10
socket:close(maxWaitMs)