(Tcl) 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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load ./chilkat.dll

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

set socket [new_CkSocket]

# Connect to an NIST time server and read the current date/time
set maxWaitMs 4000
set useTls 0
set success [CkSocket_Connect $socket "time-c.nist.gov" 37 $useTls $maxWaitMs]
if {$success != 1} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

# 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.
set bigEndian 1
set success [CkSocket_ReceiveInt32 $socket $bigEndian]
if {$success != 1} then {
    puts [CkSocket_lastErrorText $socket]
    delete_CkSocket $socket
    exit
}

set dt [new_CkDateTime]

CkDateTime_SetFromNtpTime $dt [CkSocket_get_ReceivedInt $socket]

# Show the current local date/time
set bLocalTime 1
puts "Current local date/time: [CkDateTime_getAsRfc822 $dt $bLocalTime]"

set maxWaitMs 10
CkSocket_Close $socket $maxWaitMs

delete_CkSocket $socket
delete_CkDateTime $dt